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* [PATCH v2] WIP: Evaluate arguments of correlated SubPlans in the referencing ExprState
@ 2023-02-25 21:39 Andres Freund <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Andres Freund @ 2023-02-25 21:39 UTC (permalink / raw)
---
src/include/executor/execExpr.h | 6 +-
src/include/nodes/execnodes.h | 1 -
src/backend/executor/execExpr.c | 93 +++++++++++++++++----------
src/backend/executor/execExprInterp.c | 22 +++++++
src/backend/executor/execProcnode.c | 5 ++
src/backend/executor/nodeSubplan.c | 30 ++++-----
src/backend/jit/llvm/llvmjit_expr.c | 6 ++
src/backend/jit/llvm/llvmjit_types.c | 1 +
8 files changed, 112 insertions(+), 52 deletions(-)
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index 06c3adc0a19..ca2b7306cd0 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -158,6 +158,8 @@ typedef enum ExprEvalOp
EEOP_PARAM_EXEC,
EEOP_PARAM_EXTERN,
EEOP_PARAM_CALLBACK,
+ /* set PARAM_EXEC value */
+ EEOP_PARAM_SET,
/* return CaseTestExpr value */
EEOP_CASE_TESTVAL,
@@ -374,7 +376,7 @@ typedef struct ExprEvalStep
ExprEvalRowtypeCache rowcache;
} nulltest_row;
- /* for EEOP_PARAM_EXEC/EXTERN */
+ /* for EEOP_PARAM_EXEC/EXTERN and EEOP_PARAM_SET */
struct
{
int paramid; /* numeric ID for parameter */
@@ -738,6 +740,8 @@ extern void ExecEvalParamExec(ExprState *state, ExprEvalStep *op,
ExprContext *econtext);
extern void ExecEvalParamExtern(ExprState *state, ExprEvalStep *op,
ExprContext *econtext);
+extern void ExecEvalParamSet(ExprState *state, ExprEvalStep *op,
+ ExprContext *econtext);
extern void ExecEvalCurrentOfExpr(ExprState *state, ExprEvalStep *op);
extern void ExecEvalNextValueExpr(ExprState *state, ExprEvalStep *op);
extern void ExecEvalRowNull(ExprState *state, ExprEvalStep *op,
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index e7eb1e666ff..16e95e4cb48 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -947,7 +947,6 @@ typedef struct SubPlanState
struct PlanState *planstate; /* subselect plan's state tree */
struct PlanState *parent; /* parent plan node's state tree */
ExprState *testexpr; /* state of combining expression */
- List *args; /* states of argument expression(s) */
HeapTuple curTuple; /* copy of most recent tuple from subplan */
Datum curArray; /* most recent array from ARRAY() subplan */
/* these are used when hashing the subselect's output: */
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index c61f23c6c18..002f2a0091f 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -87,6 +87,9 @@ static void ExecBuildAggTransCall(ExprState *state, AggState *aggstate,
FunctionCallInfo fcinfo, AggStatePerTrans pertrans,
int transno, int setno, int setoff, bool ishash,
bool nullcheck);
+static void ExecInitSubPlanExpr(SubPlan *subplan,
+ ExprState *state,
+ Datum *resv, bool *resnull);
/*
@@ -1388,7 +1391,6 @@ ExecInitExprRec(Expr *node, ExprState *state,
case T_SubPlan:
{
SubPlan *subplan = (SubPlan *) node;
- SubPlanState *sstate;
/*
* Real execution of a MULTIEXPR SubPlan has already been
@@ -1405,19 +1407,7 @@ ExecInitExprRec(Expr *node, ExprState *state,
break;
}
- if (!state->parent)
- elog(ERROR, "SubPlan found with no parent plan");
-
- sstate = ExecInitSubPlan(subplan, state->parent);
-
- /* add SubPlanState nodes to state->parent->subPlan */
- state->parent->subPlan = lappend(state->parent->subPlan,
- sstate);
-
- scratch.opcode = EEOP_SUBPLAN;
- scratch.d.subplan.sstate = sstate;
-
- ExprEvalPushStep(state, &scratch);
+ ExecInitSubPlanExpr(subplan, state, resv, resnull);
break;
}
@@ -2618,29 +2608,12 @@ ExecPushExprSetupSteps(ExprState *state, ExprSetupInfo *info)
foreach(lc, info->multiexpr_subplans)
{
SubPlan *subplan = (SubPlan *) lfirst(lc);
- SubPlanState *sstate;
Assert(subplan->subLinkType == MULTIEXPR_SUBLINK);
- /* This should match what ExecInitExprRec does for other SubPlans: */
-
- if (!state->parent)
- elog(ERROR, "SubPlan found with no parent plan");
-
- sstate = ExecInitSubPlan(subplan, state->parent);
-
- /* add SubPlanState nodes to state->parent->subPlan */
- state->parent->subPlan = lappend(state->parent->subPlan,
- sstate);
-
- scratch.opcode = EEOP_SUBPLAN;
- scratch.d.subplan.sstate = sstate;
-
/* The result can be ignored, but we better put it somewhere */
- scratch.resvalue = &state->resvalue;
- scratch.resnull = &state->resnull;
-
- ExprEvalPushStep(state, &scratch);
+ ExecInitSubPlanExpr(subplan, state,
+ &state->resvalue, &state->resnull);
}
}
@@ -4040,3 +4013,57 @@ ExecBuildParamSetEqual(TupleDesc desc,
return state;
}
+
+static void
+ExecInitSubPlanExpr(SubPlan *subplan,
+ ExprState *state,
+ Datum *resv, bool *resnull)
+{
+ ExprEvalStep scratch = {0};
+ SubPlanState *sstate;
+ ListCell *pvar;
+ ListCell *l;
+
+ if (!state->parent)
+ elog(ERROR, "SubPlan found with no parent plan");
+
+ /*
+ * Generate steps to evaluate input arguments for the subplan.
+ *
+ * We evaluate the argument expressions into ExprState's resvalue/resnull,
+ * and then use PARAM_SET to update the parameter. We do that, instead of
+ * evaluating directly into the param, to avoid depending on the pointer
+ * value remaining stable / being included in the generated expression. No
+ * danger of conflicts with other uses of resvalue/resnull as storing and
+ * using the value always is in subsequent steps.
+ *
+ * Any calculation we have to do can be done in the parent econtext, since
+ * the Param values don't need to have per-query lifetime.
+ */
+ forboth(l, subplan->parParam, pvar, subplan->args)
+ {
+ int paramid = lfirst_int(l);
+
+ ExecInitExprRec(lfirst(pvar), state,
+ &state->resvalue, &state->resnull);
+
+ scratch.opcode = EEOP_PARAM_SET;
+ scratch.d.param.paramid = paramid;
+ /* type isn't needed, but an old value could be confusing */
+ scratch.d.param.paramtype = InvalidOid;
+ ExprEvalPushStep(state, &scratch);
+ }
+
+ sstate = ExecInitSubPlan(subplan, state->parent);
+
+ /* add SubPlanState nodes to state->parent->subPlan */
+ state->parent->subPlan = lappend(state->parent->subPlan,
+ sstate);
+
+ scratch.opcode = EEOP_SUBPLAN;
+ scratch.resvalue = resv;
+ scratch.resnull = resnull;
+ scratch.d.subplan.sstate = sstate;
+
+ ExprEvalPushStep(state, &scratch);
+}
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index 19351fe34bf..3cab8a5cdae 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -446,6 +446,7 @@ ExecInterpExpr(ExprState *state, ExprContext *econtext, bool *isnull)
&&CASE_EEOP_PARAM_EXEC,
&&CASE_EEOP_PARAM_EXTERN,
&&CASE_EEOP_PARAM_CALLBACK,
+ &&CASE_EEOP_PARAM_SET,
&&CASE_EEOP_CASE_TESTVAL,
&&CASE_EEOP_MAKE_READONLY,
&&CASE_EEOP_IOCOERCE,
@@ -1081,6 +1082,13 @@ ExecInterpExpr(ExprState *state, ExprContext *econtext, bool *isnull)
EEO_NEXT();
}
+ EEO_CASE(EEOP_PARAM_SET)
+ {
+ /* out of line, unlikely to matter performancewise */
+ ExecEvalParamSet(state, op, econtext);
+ EEO_NEXT();
+ }
+
EEO_CASE(EEOP_CASE_TESTVAL)
{
/*
@@ -2477,6 +2485,20 @@ ExecEvalParamExtern(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
errmsg("no value found for parameter %d", paramId)));
}
+/*
+ * Set value of a param (currently always PARAM_EXEC) from
+ * state->res{value,null}.
+ */
+void
+ExecEvalParamSet(ExprState *state, ExprEvalStep *op, ExprContext *econtext)
+{
+ ParamExecData *prm;
+
+ prm = &(econtext->ecxt_param_exec_vals[op->d.param.paramid]);
+ prm->value = state->resvalue;
+ prm->isnull = state->resnull;
+}
+
/*
* Raise error if a CURRENT OF expression is evaluated.
*
diff --git a/src/backend/executor/execProcnode.c b/src/backend/executor/execProcnode.c
index 4d288bc8d41..f62bb28140f 100644
--- a/src/backend/executor/execProcnode.c
+++ b/src/backend/executor/execProcnode.c
@@ -393,6 +393,10 @@ ExecInitNode(Plan *node, EState *estate, int eflags)
/*
* Initialize any initPlans present in this node. The planner put them in
* a separate list for us.
+ *
+ * The defining characteristic of initplans is that they don't have
+ * arguments, so we don't need to evaluate them (in contrast to
+ * ExecInitSubPlanExpr()).
*/
subps = NIL;
foreach(l, node->initPlan)
@@ -401,6 +405,7 @@ ExecInitNode(Plan *node, EState *estate, int eflags)
SubPlanState *sstate;
Assert(IsA(subplan, SubPlan));
+ Assert(subplan->args == NIL);
sstate = ExecInitSubPlan(subplan, result);
subps = lappend(subps, sstate);
}
diff --git a/src/backend/executor/nodeSubplan.c b/src/backend/executor/nodeSubplan.c
index c136f75ac24..3458ac007cd 100644
--- a/src/backend/executor/nodeSubplan.c
+++ b/src/backend/executor/nodeSubplan.c
@@ -107,7 +107,7 @@ ExecHashSubPlan(SubPlanState *node,
TupleTableSlot *slot;
/* Shouldn't have any direct correlation Vars */
- if (subplan->parParam != NIL || node->args != NIL)
+ if (subplan->parParam != NIL || subplan->args != NIL)
elog(ERROR, "hashed subplan with direct correlation not supported");
/*
@@ -231,7 +231,6 @@ ExecScanSubPlan(SubPlanState *node,
TupleTableSlot *slot;
Datum result;
bool found = false; /* true if got at least one subplan tuple */
- ListCell *pvar;
ListCell *l;
ArrayBuildStateAny *astate = NULL;
@@ -248,26 +247,20 @@ ExecScanSubPlan(SubPlanState *node,
oldcontext = MemoryContextSwitchTo(econtext->ecxt_per_query_memory);
/*
- * Set Params of this plan from parent plan correlation values. (Any
- * calculation we have to do is done in the parent econtext, since the
- * Param values don't need to have per-query lifetime.)
+ * We rely on the caller to evaluate plan correlation values, if
+ * necessary. However we still need to record the fact that the values
+ * (might have) changed, otherwise the ExecReScan() below won't know that
+ * nodes need to be rescanned.
*/
- Assert(list_length(subplan->parParam) == list_length(node->args));
-
- forboth(l, subplan->parParam, pvar, node->args)
+ Assert(list_length(subplan->parParam) == list_length(subplan->args));
+ foreach(l, subplan->parParam)
{
int paramid = lfirst_int(l);
- ParamExecData *prm = &(econtext->ecxt_param_exec_vals[paramid]);
- prm->value = ExecEvalExprSwitchContext((ExprState *) lfirst(pvar),
- econtext,
- &(prm->isnull));
planstate->chgParam = bms_add_member(planstate->chgParam, paramid);
}
- /*
- * Now that we've set up its parameters, we can reset the subplan.
- */
+ /* with that done, we can reset the subplan */
ExecReScan(planstate);
/*
@@ -817,6 +810,10 @@ slotNoNulls(TupleTableSlot *slot)
* as well as regular SubPlans. Note that we don't link the SubPlan into
* the parent's subPlan list, because that shouldn't happen for InitPlans.
* Instead, ExecInitExpr() does that one part.
+ *
+ * We also rely on ExecInitExpr(), more precisely ExecInitSubPlanExpr(), to
+ * evaluate input parameters, as that allows them to be evaluated as part of
+ * the expression referencing the SubPlan.
* ----------------------------------------------------------------
*/
SubPlanState *
@@ -844,7 +841,6 @@ ExecInitSubPlan(SubPlan *subplan, PlanState *parent)
/* Initialize subexpressions */
sstate->testexpr = ExecInitExpr((Expr *) subplan->testexpr, parent);
- sstate->args = ExecInitExprList(subplan->args, parent);
/*
* initialize my state
@@ -1107,7 +1103,7 @@ ExecSetParamPlan(SubPlanState *node, ExprContext *econtext)
elog(ERROR, "ANY/ALL subselect unsupported as initplan");
if (subLinkType == CTE_SUBLINK)
elog(ERROR, "CTE subplans should not be executed via ExecSetParamPlan");
- if (subplan->parParam || node->args)
+ if (subplan->parParam || subplan->args)
elog(ERROR, "correlated subplans should not be executed via ExecSetParamPlan");
/*
diff --git a/src/backend/jit/llvm/llvmjit_expr.c b/src/backend/jit/llvm/llvmjit_expr.c
index 1c722c79552..812f8758743 100644
--- a/src/backend/jit/llvm/llvmjit_expr.c
+++ b/src/backend/jit/llvm/llvmjit_expr.c
@@ -1094,6 +1094,12 @@ llvm_compile_expr(ExprState *state)
break;
}
+ case EEOP_PARAM_SET:
+ build_EvalXFunc(b, mod, "ExecEvalParamSet",
+ v_state, op, v_econtext);
+ LLVMBuildBr(b, opblocks[opno + 1]);
+ break;
+
case EEOP_SBSREF_SUBSCRIPTS:
{
int jumpdone = op->d.sbsref_subscript.jumpdone;
diff --git a/src/backend/jit/llvm/llvmjit_types.c b/src/backend/jit/llvm/llvmjit_types.c
index 876fb640294..0b1df3afe00 100644
--- a/src/backend/jit/llvm/llvmjit_types.c
+++ b/src/backend/jit/llvm/llvmjit_types.c
@@ -123,6 +123,7 @@ void *referenced_functions[] =
ExecEvalNextValueExpr,
ExecEvalParamExec,
ExecEvalParamExtern,
+ ExecEvalParamSet,
ExecEvalRow,
ExecEvalRowNotNull,
ExecEvalRowNull,
--
2.37.1.188.g71a8fab31b
--2fo66m5ddj2bowyf--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1] WIP: Evaluate arguments of correlated SubPlans in the referencing ExprState
@ 2023-02-25 21:39 Andres Freund <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Andres Freund @ 2023-02-25 21:39 UTC (permalink / raw)
---
src/include/nodes/execnodes.h | 1 -
src/backend/executor/execExpr.c | 81 +++++++++++++++++------------
src/backend/executor/execProcnode.c | 5 ++
src/backend/executor/nodeSubplan.c | 30 +++++------
4 files changed, 66 insertions(+), 51 deletions(-)
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 20f4c8b35f3..437cf8b5a02 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -947,7 +947,6 @@ typedef struct SubPlanState
struct PlanState *planstate; /* subselect plan's state tree */
struct PlanState *parent; /* parent plan node's state tree */
ExprState *testexpr; /* state of combining expression */
- List *args; /* states of argument expression(s) */
HeapTuple curTuple; /* copy of most recent tuple from subplan */
Datum curArray; /* most recent array from ARRAY() subplan */
/* these are used when hashing the subselect's output: */
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index c61f23c6c18..7a9d5729b4b 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -87,6 +87,9 @@ static void ExecBuildAggTransCall(ExprState *state, AggState *aggstate,
FunctionCallInfo fcinfo, AggStatePerTrans pertrans,
int transno, int setno, int setoff, bool ishash,
bool nullcheck);
+static void ExecInitSubPlanExpr(SubPlan *subplan,
+ ExprState *state,
+ Datum *resv, bool *resnull);
/*
@@ -1388,7 +1391,6 @@ ExecInitExprRec(Expr *node, ExprState *state,
case T_SubPlan:
{
SubPlan *subplan = (SubPlan *) node;
- SubPlanState *sstate;
/*
* Real execution of a MULTIEXPR SubPlan has already been
@@ -1405,19 +1407,7 @@ ExecInitExprRec(Expr *node, ExprState *state,
break;
}
- if (!state->parent)
- elog(ERROR, "SubPlan found with no parent plan");
-
- sstate = ExecInitSubPlan(subplan, state->parent);
-
- /* add SubPlanState nodes to state->parent->subPlan */
- state->parent->subPlan = lappend(state->parent->subPlan,
- sstate);
-
- scratch.opcode = EEOP_SUBPLAN;
- scratch.d.subplan.sstate = sstate;
-
- ExprEvalPushStep(state, &scratch);
+ ExecInitSubPlanExpr(subplan, state, resv, resnull);
break;
}
@@ -2618,29 +2608,12 @@ ExecPushExprSetupSteps(ExprState *state, ExprSetupInfo *info)
foreach(lc, info->multiexpr_subplans)
{
SubPlan *subplan = (SubPlan *) lfirst(lc);
- SubPlanState *sstate;
Assert(subplan->subLinkType == MULTIEXPR_SUBLINK);
- /* This should match what ExecInitExprRec does for other SubPlans: */
-
- if (!state->parent)
- elog(ERROR, "SubPlan found with no parent plan");
-
- sstate = ExecInitSubPlan(subplan, state->parent);
-
- /* add SubPlanState nodes to state->parent->subPlan */
- state->parent->subPlan = lappend(state->parent->subPlan,
- sstate);
-
- scratch.opcode = EEOP_SUBPLAN;
- scratch.d.subplan.sstate = sstate;
-
/* The result can be ignored, but we better put it somewhere */
- scratch.resvalue = &state->resvalue;
- scratch.resnull = &state->resnull;
-
- ExprEvalPushStep(state, &scratch);
+ ExecInitSubPlanExpr(subplan, state,
+ &state->resvalue, &state->resnull);
}
}
@@ -4040,3 +4013,45 @@ ExecBuildParamSetEqual(TupleDesc desc,
return state;
}
+
+static void
+ExecInitSubPlanExpr(SubPlan *subplan,
+ ExprState *state,
+ Datum *resv, bool *resnull)
+{
+ ExprEvalStep scratch = {0};
+ SubPlanState *sstate;
+ ListCell *pvar;
+ ListCell *l;
+ EState *estate = state->parent->state;
+
+ if (!state->parent)
+ elog(ERROR, "SubPlan found with no parent plan");
+
+ /*
+ * Generate steps to evaluate input arguments for the subplan.
+ *
+ * Any calculation we have to do can be done in the parent econtext, since
+ * the Param values don't need to have per-query lifetime.
+ */
+ forboth(l, subplan->parParam, pvar, subplan->args)
+ {
+ int paramid = lfirst_int(l);
+ ParamExecData *prm = &estate->es_param_exec_vals[paramid];
+
+ ExecInitExprRec(lfirst(pvar), state, &prm->value, &prm->isnull);
+ }
+
+ sstate = ExecInitSubPlan(subplan, state->parent);
+
+ /* add SubPlanState nodes to state->parent->subPlan */
+ state->parent->subPlan = lappend(state->parent->subPlan,
+ sstate);
+
+ scratch.opcode = EEOP_SUBPLAN;
+ scratch.resvalue = resv;
+ scratch.resnull = resnull;
+ scratch.d.subplan.sstate = sstate;
+
+ ExprEvalPushStep(state, &scratch);
+}
diff --git a/src/backend/executor/execProcnode.c b/src/backend/executor/execProcnode.c
index 4d288bc8d41..f62bb28140f 100644
--- a/src/backend/executor/execProcnode.c
+++ b/src/backend/executor/execProcnode.c
@@ -393,6 +393,10 @@ ExecInitNode(Plan *node, EState *estate, int eflags)
/*
* Initialize any initPlans present in this node. The planner put them in
* a separate list for us.
+ *
+ * The defining characteristic of initplans is that they don't have
+ * arguments, so we don't need to evaluate them (in contrast to
+ * ExecInitSubPlanExpr()).
*/
subps = NIL;
foreach(l, node->initPlan)
@@ -401,6 +405,7 @@ ExecInitNode(Plan *node, EState *estate, int eflags)
SubPlanState *sstate;
Assert(IsA(subplan, SubPlan));
+ Assert(subplan->args == NIL);
sstate = ExecInitSubPlan(subplan, result);
subps = lappend(subps, sstate);
}
diff --git a/src/backend/executor/nodeSubplan.c b/src/backend/executor/nodeSubplan.c
index c136f75ac24..3458ac007cd 100644
--- a/src/backend/executor/nodeSubplan.c
+++ b/src/backend/executor/nodeSubplan.c
@@ -107,7 +107,7 @@ ExecHashSubPlan(SubPlanState *node,
TupleTableSlot *slot;
/* Shouldn't have any direct correlation Vars */
- if (subplan->parParam != NIL || node->args != NIL)
+ if (subplan->parParam != NIL || subplan->args != NIL)
elog(ERROR, "hashed subplan with direct correlation not supported");
/*
@@ -231,7 +231,6 @@ ExecScanSubPlan(SubPlanState *node,
TupleTableSlot *slot;
Datum result;
bool found = false; /* true if got at least one subplan tuple */
- ListCell *pvar;
ListCell *l;
ArrayBuildStateAny *astate = NULL;
@@ -248,26 +247,20 @@ ExecScanSubPlan(SubPlanState *node,
oldcontext = MemoryContextSwitchTo(econtext->ecxt_per_query_memory);
/*
- * Set Params of this plan from parent plan correlation values. (Any
- * calculation we have to do is done in the parent econtext, since the
- * Param values don't need to have per-query lifetime.)
+ * We rely on the caller to evaluate plan correlation values, if
+ * necessary. However we still need to record the fact that the values
+ * (might have) changed, otherwise the ExecReScan() below won't know that
+ * nodes need to be rescanned.
*/
- Assert(list_length(subplan->parParam) == list_length(node->args));
-
- forboth(l, subplan->parParam, pvar, node->args)
+ Assert(list_length(subplan->parParam) == list_length(subplan->args));
+ foreach(l, subplan->parParam)
{
int paramid = lfirst_int(l);
- ParamExecData *prm = &(econtext->ecxt_param_exec_vals[paramid]);
- prm->value = ExecEvalExprSwitchContext((ExprState *) lfirst(pvar),
- econtext,
- &(prm->isnull));
planstate->chgParam = bms_add_member(planstate->chgParam, paramid);
}
- /*
- * Now that we've set up its parameters, we can reset the subplan.
- */
+ /* with that done, we can reset the subplan */
ExecReScan(planstate);
/*
@@ -817,6 +810,10 @@ slotNoNulls(TupleTableSlot *slot)
* as well as regular SubPlans. Note that we don't link the SubPlan into
* the parent's subPlan list, because that shouldn't happen for InitPlans.
* Instead, ExecInitExpr() does that one part.
+ *
+ * We also rely on ExecInitExpr(), more precisely ExecInitSubPlanExpr(), to
+ * evaluate input parameters, as that allows them to be evaluated as part of
+ * the expression referencing the SubPlan.
* ----------------------------------------------------------------
*/
SubPlanState *
@@ -844,7 +841,6 @@ ExecInitSubPlan(SubPlan *subplan, PlanState *parent)
/* Initialize subexpressions */
sstate->testexpr = ExecInitExpr((Expr *) subplan->testexpr, parent);
- sstate->args = ExecInitExprList(subplan->args, parent);
/*
* initialize my state
@@ -1107,7 +1103,7 @@ ExecSetParamPlan(SubPlanState *node, ExprContext *econtext)
elog(ERROR, "ANY/ALL subselect unsupported as initplan");
if (subLinkType == CTE_SUBLINK)
elog(ERROR, "CTE subplans should not be executed via ExecSetParamPlan");
- if (subplan->parParam || node->args)
+ if (subplan->parParam || subplan->args)
elog(ERROR, "correlated subplans should not be executed via ExecSetParamPlan");
/*
--
2.38.0
--6ir4gcdcv6d4j3qy--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/3] Remove unnecessary volatile qualifiers.
@ 2026-02-18 16:31 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-02-18 16:31 UTC (permalink / raw)
---
src/backend/replication/syncrep.c | 19 ++++++++-----------
src/backend/storage/ipc/procsignal.c | 4 ++--
src/backend/storage/lmgr/lock.c | 2 +-
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
5 files changed, 14 insertions(+), 17 deletions(-)
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index 7ea6001e9ad..045fd35786a 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -473,7 +473,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -548,19 +547,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -767,8 +766,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -905,7 +903,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -920,7 +917,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 5d33559926a..97791f979ef 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -283,7 +283,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -394,7 +394,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index e1168ad3837..718de1b5e98 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -309,7 +309,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
/*
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 579e5933d28..a1ec13d66b9 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -36,7 +36,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -256,7 +256,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index 368e4f3f234..14972f7e7cd 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -50,7 +50,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--J5cpktPts8HkLShw
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0002-Remove-SpinLockFree-and-S_LOCK_FREE.patch
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH] Teach REPACK to upgrade its lock safely.
@ 2026-04-14 09:59 Antonin Houska <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Antonin Houska @ 2026-04-14 09:59 UTC (permalink / raw)
REPACK (CONCURRENTLY) needs to upgrade its ShareUpdateExclusiveLock (SUEL) to
AccessExclusiveLock at the end of table processing. If another session, which
already has a non-conflicting lock on the table, tried to get SUEL too, it
would end up in a deadlock with REPACK. Such situation does not hurt as long
as the deadlock detector choses to terminate the other session, but it's
possible that it terminates REPACK. A lot of REPACK's work would be wasted
this way.
This patch checks for such situation, and if the other session tries to get
the SUEL, it receives a deadlock report before it actually starts waiting.
Please note that the other session can safely run VACUUM w/o receiving the
deadlock report. The point is that VACUUM cannot run in a transaction block,
so the session cannot have any other lock when trying to get SUEL on the
table. In that case, REPACK gets its AccessExclusiveLock first, even if VACUUM
requested SUEL earlier. VACUUM then just needs wait for REPACK to finish, and
then it can start.
---
src/backend/commands/repack.c | 25 +++++++-
src/backend/storage/lmgr/deadlock.c | 10 ++--
src/backend/storage/lmgr/lock.c | 30 ++++++++++
src/backend/storage/lmgr/proc.c | 55 ++++++++++++++++-
src/include/storage/lock.h | 5 +-
src/include/storage/proc.h | 6 +-
.../injection_points/expected/repack.out | 59 ++++++++++++++++++-
.../injection_points/specs/repack.spec | 29 +++++++++
8 files changed, 209 insertions(+), 10 deletions(-)
diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index 58e3867246f..e9193067666 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -285,6 +285,18 @@ ExecRepack(ParseState *pstate, RepackStmt *stmt, bool isTopLevel)
* to understand and we don't lose any functionality.
*/
PreventInTransactionBlock(isTopLevel, "REPACK (CONCURRENTLY)");
+
+ /*
+ * Also set the PROC_IN_CONCURRENT_REPACK flag. This makes the lock
+ * manager cause anyone that would conflict with us to error out.
+ * It's important to set this flag ahead of actually locking the
+ * relation; it won't of course affect anyone until we do have a lock
+ * that others can conflict with.
+ */
+ LWLockAcquire(ProcArrayLock, LW_EXCLUSIVE);
+ MyProc->statusFlags |= PROC_IN_CONCURRENT_REPACK;
+ ProcGlobal->statusFlags[MyProc->pgxactoff] = MyProc->statusFlags;
+ LWLockRelease(ProcArrayLock);
}
/*
@@ -3086,7 +3098,18 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
LockRelationOid(OldHeap->rd_rel->reltoastrelid, AccessExclusiveLock);
/*
- * Tuples and pages of the old heap will be gone, but the heap will stay.
+ * Now that we have all access-exclusive locks on all relations, we no
+ * longer want other processes to error out when trying to acquire a
+ * conflicting lock. Therefore, unset our flag.
+ */
+ LWLockAcquire(ProcArrayLock, LW_EXCLUSIVE);
+ MyProc->statusFlags &= ~PROC_IN_CONCURRENT_REPACK;
+ ProcGlobal->statusFlags[MyProc->pgxactoff] = MyProc->statusFlags;
+ LWLockRelease(ProcArrayLock);
+
+ /*
+ * Tuples and pages of the old heap will be gone, but the heap itself will
+ * stay.
*/
TransferPredicateLocksToHeapRelation(OldHeap);
foreach_ptr(RelationData, index, indexrels)
diff --git a/src/backend/storage/lmgr/deadlock.c b/src/backend/storage/lmgr/deadlock.c
index b8962d875b6..3772a7aa3df 100644
--- a/src/backend/storage/lmgr/deadlock.c
+++ b/src/backend/storage/lmgr/deadlock.c
@@ -1146,8 +1146,10 @@ DeadLockReport(void)
void
RememberSimpleDeadLock(PGPROC *proc1,
LOCKMODE lockmode,
- LOCK *lock,
- PGPROC *proc2)
+ LOCK *lock, /* XXX Only lockmode? */
+ PGPROC *proc2,
+ LOCKMODE lockmode2,
+ LOCKTAG *locktag2)
{
DEADLOCK_INFO *info = &deadlockDetails[0];
@@ -1155,8 +1157,8 @@ RememberSimpleDeadLock(PGPROC *proc1,
info->lockmode = lockmode;
info->pid = proc1->pid;
info++;
- info->locktag = proc2->waitLock->tag;
- info->lockmode = proc2->waitLockMode;
+ info->locktag = *locktag2;
+ info->lockmode = lockmode2;
info->pid = proc2->pid;
nDeadlockDetails = 2;
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index c221fe96889..44aa2ca26a7 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -674,6 +674,36 @@ LockHeldByMe(const LOCKTAG *locktag,
return false;
}
+/*
+ * HaveRelLock -- test whether the current backend has a fast path lock on
+ * the relation in any mode.
+ */
+bool
+HaveFastPathLock(Oid relid)
+{
+ uint32 group = FAST_PATH_REL_GROUP(relid);
+ bool result = false;
+
+ LWLockAcquire(&MyProc->fpInfoLock, LW_SHARED);
+ for (int i = 0; i < FP_LOCK_SLOTS_PER_GROUP; i++)
+ {
+ uint32 f = FAST_PATH_SLOT(group, i);
+ uint32 lockmask;
+
+ if (relid != MyProc->fpRelId[f])
+ continue;
+ lockmask = FAST_PATH_GET_BITS(MyProc, f);
+ if (lockmask)
+ {
+ result = true;
+ break;
+ }
+ }
+ LWLockRelease(&MyProc->fpInfoLock);
+
+ return result;
+}
+
#ifdef USE_ASSERT_CHECKING
/*
* GetLockMethodLocalHash -- return the hash of local locks, for modules that
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 1ac25068d62..3d47b1284a3 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -1156,6 +1156,7 @@ JoinWaitQueue(LOCALLOCK *locallock, LockMethod lockMethodTable, bool dontWait)
LOCKMASK myHeldLocks;
bool early_deadlock = false;
PGPROC *leader = MyProc->lockGroupLeader;
+ bool check_repack = false;
Assert(LWLockHeldByMeInMode(partitionLock, LW_EXCLUSIVE));
@@ -1193,6 +1194,56 @@ JoinWaitQueue(LOCALLOCK *locallock, LockMethod lockMethodTable, bool dontWait)
}
}
+ /*
+ * If I am already holding this lock (in any mode) and trying to get
+ * ShareUpdateExclusiveLock (or higher), check if REPACK (CONCURRENTLY) is
+ * already holding ShareUpdateExclusiveLock. The problem is if that by
+ * trying to upgrade the lock to AccessExclusiveLock it would get into a
+ * deadlock with us.
+ */
+ if (lock->tag.locktag_type == LOCKTAG_RELATION &&
+ lock->tag.locktag_field1 == MyDatabaseId &&
+ lockmode >= ShareUpdateExclusiveLock)
+ {
+ if (myHeldLocks > 0 ||
+ HaveFastPathLock(lock->tag.locktag_field2))
+ check_repack = true;
+ }
+ if (check_repack)
+ {
+ dlist_iter iter;
+
+ dlist_foreach(iter, &lock->procLocks)
+ {
+ PROCLOCK *otherproclock;
+ PGPROC *otherproc;
+
+ otherproclock = dlist_container(PROCLOCK, lockLink, iter.cur);
+ otherproc = otherproclock->tag.myProc;
+ if (otherproc != MyProc &&
+ otherproc->statusFlags & PROC_IN_CONCURRENT_REPACK)
+ {
+ LOCKMASK repackmask = otherproclock->holdMask;
+
+ /*
+ * Is REPACK already holding ShareUpdateExclusiveLock?
+ */
+ if ((repackmask & LOCKBIT_ON(ShareUpdateExclusiveLock)) != 0)
+ {
+ /*
+ * There should be no more than one REPACK working on
+ * particular table, so let's error out.
+ */
+ RememberSimpleDeadLock(MyProc, lockmode, lock,
+ otherproc,
+ ShareUpdateExclusiveLock,
+ &otherproclock->tag.myLock->tag);
+ return PROC_WAIT_STATUS_ERROR;
+ }
+ }
+ }
+ }
+
/*
* Determine where to add myself in the wait queue.
*
@@ -1240,7 +1291,9 @@ JoinWaitQueue(LOCALLOCK *locallock, LockMethod lockMethodTable, bool dontWait)
* a flag to check below, and break out of loop. Also,
* record deadlock info for later message.
*/
- RememberSimpleDeadLock(MyProc, lockmode, lock, proc);
+ RememberSimpleDeadLock(MyProc, lockmode, lock, proc,
+ proc->waitLockMode,
+ &proc->waitLock->tag);
early_deadlock = true;
break;
}
diff --git a/src/include/storage/lock.h b/src/include/storage/lock.h
index ee3cb1dc203..85804d61ce9 100644
--- a/src/include/storage/lock.h
+++ b/src/include/storage/lock.h
@@ -401,6 +401,7 @@ extern void LockReleaseCurrentOwner(LOCALLOCK **locallocks, int nlocks);
extern void LockReassignCurrentOwner(LOCALLOCK **locallocks, int nlocks);
extern bool LockHeldByMe(const LOCKTAG *locktag,
LOCKMODE lockmode, bool orstronger);
+extern bool HaveFastPathLock(Oid relid);
#ifdef USE_ASSERT_CHECKING
extern HTAB *GetLockMethodLocalHash(void);
#endif
@@ -440,7 +441,9 @@ pg_noreturn extern void DeadLockReport(void);
extern void RememberSimpleDeadLock(PGPROC *proc1,
LOCKMODE lockmode,
LOCK *lock,
- PGPROC *proc2);
+ PGPROC *proc2,
+ LOCKMODE lockmode2,
+ LOCKTAG *locktag2);
extern void InitDeadLockChecking(void);
extern int LockWaiterCount(const LOCKTAG *locktag);
diff --git a/src/include/storage/proc.h b/src/include/storage/proc.h
index 3e1d1fad5f9..76c6bb44251 100644
--- a/src/include/storage/proc.h
+++ b/src/include/storage/proc.h
@@ -70,10 +70,12 @@ struct XidCache
#define PROC_AFFECTS_ALL_HORIZONS 0x20 /* this proc's xmin must be
* included in vacuum horizons
* in all databases */
+#define PROC_IN_CONCURRENT_REPACK 0x40 /* REPACK (CONCURRENTLY) */
-/* flags reset at EOXact */
+/* flags reset at EOXact. A bit of a misnomer ... */
#define PROC_VACUUM_STATE_MASK \
- (PROC_IN_VACUUM | PROC_IN_SAFE_IC | PROC_VACUUM_FOR_WRAPAROUND)
+ (PROC_IN_VACUUM | PROC_IN_SAFE_IC | PROC_VACUUM_FOR_WRAPAROUND | \
+ PROC_IN_CONCURRENT_REPACK)
/*
* Xmin-related flags. Make sure any flags that affect how the process' Xmin
diff --git a/src/test/modules/injection_points/expected/repack.out b/src/test/modules/injection_points/expected/repack.out
index b575e9052ee..960044776f4 100644
--- a/src/test/modules/injection_points/expected/repack.out
+++ b/src/test/modules/injection_points/expected/repack.out
@@ -1,4 +1,4 @@
-Parsed test spec with 2 sessions
+Parsed test spec with 3 sessions
starting permutation: wait_before_lock change_existing change_new change_subxact1 change_subxact2 check2 wakeup_before_lock check1
injection_points_attach
@@ -111,3 +111,60 @@ injection_points_detach
(1 row)
+
+starting permutation: check1_relnode_only wait_before_lock lock3 wakeup_before_lock check1_relnode_only
+injection_points_attach
+-----------------------
+
+(1 row)
+
+step check1_relnode_only:
+ INSERT INTO relfilenodes(node)
+ SELECT relfilenode FROM pg_class WHERE relname='repack_test';
+
+ SELECT count(DISTINCT node) FROM relfilenodes;
+
+count
+-----
+ 1
+(1 row)
+
+step wait_before_lock:
+ REPACK (CONCURRENTLY) repack_test USING INDEX repack_test_pkey;
+ <waiting ...>
+step lock3:
+ BEGIN;
+ SELECT * FROM repack_test ORDER BY i LIMIT 1;
+ LOCK TABLE repack_test IN SHARE UPDATE EXCLUSIVE MODE;
+
+i|j
+-+-
+1|1
+(1 row)
+
+ERROR: deadlock detected
+step wakeup_before_lock:
+ SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+
+(1 row)
+
+step wait_before_lock: <... completed>
+step check1_relnode_only:
+ INSERT INTO relfilenodes(node)
+ SELECT relfilenode FROM pg_class WHERE relname='repack_test';
+
+ SELECT count(DISTINCT node) FROM relfilenodes;
+
+count
+-----
+ 2
+(1 row)
+
+injection_points_detach
+-----------------------
+
+(1 row)
+
diff --git a/src/test/modules/injection_points/specs/repack.spec b/src/test/modules/injection_points/specs/repack.spec
index d727a9b056b..5ffcb558718 100644
--- a/src/test/modules/injection_points/specs/repack.spec
+++ b/src/test/modules/injection_points/specs/repack.spec
@@ -55,6 +55,13 @@ step check1
FROM data_s1 d1 FULL JOIN data_s2 d2 USING (i, j)
WHERE d1.i ISNULL OR d2.i ISNULL;
}
+step check1_relnode_only
+{
+ INSERT INTO relfilenodes(node)
+ SELECT relfilenode FROM pg_class WHERE relname='repack_test';
+
+ SELECT count(DISTINCT node) FROM relfilenodes;
+}
teardown
{
SELECT injection_points_detach('repack-concurrently-before-lock');
@@ -129,6 +136,20 @@ step wakeup_before_lock
SELECT injection_points_wakeup('repack-concurrently-before-lock');
}
+session s3
+# Try to acquire SharedUpdateExclusiveLock on a table while REPACK is already
+# holding it and before it tries to upgrade it to AccessExclusiveLock. Since
+# this session is already holding another lock no the table, REPACK cannot
+# resolve the problem by getting ahead in the wait queue. The solution is that
+# the LOCK TABLE triggers a deadlock report. The deadlock does not actually
+# take place, but it would if this session started to wait.
+step lock3
+{
+ BEGIN;
+ SELECT * FROM repack_test ORDER BY i LIMIT 1;
+ LOCK TABLE repack_test IN SHARE UPDATE EXCLUSIVE MODE;
+}
+
# Test if data changes introduced while one session is performing REPACK
# CONCURRENTLY find their way into the table.
permutation
@@ -140,3 +161,11 @@ permutation
check2
wakeup_before_lock
check1
+
+# See 'lock3' above. We check relnodes to make sure that REPACK finished.
+permutation
+ check1_relnode_only
+ wait_before_lock
+ lock3
+ wakeup_before_lock
+ check1_relnode_only
--
2.47.3
--=-=-=--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v1 1/1] Remove unnecessary volatile qualifiers.
@ 2026-06-30 21:41 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:41 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers to pg_atomic_* variables or local variables that hold a
value returned by a pg_atomic_* function. The pointer arguments
for the pg_atomic_* functions are volatile-qualified, so there's no
need to mark the pointer volatile. Likewise, a local variable that
just holds the result of a pg_atomic_* function gains nothing from
volatile.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
when they were modified inside a PG_TRY block and used afterward,
but the PG_TRY was later removed.
---
src/backend/access/transam/clog.c | 2 +-
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 10 ++++-----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..47975ba892f 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,7 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
+ PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..4acef19e563 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
{
uint64 local_gen;
uint64 shared_gen;
- volatile uint32 flags;
+ uint32 flags;
Assert(MyProcSignalSlot);
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--hE8tq9meMVMcgUcn--
^ permalink raw reply [nested|flat] 153+ messages in thread
* remove unnecessary volatile qualifiers
@ 2026-06-30 21:47 Nathan Bossart <[email protected]>
0 siblings, 1 reply; 153+ messages in thread
From: Nathan Bossart @ 2026-06-30 21:47 UTC (permalink / raw)
To: pgsql-hackers
I looked into some of these earlier [0], but ended up leaving them alone at
the time. Here is a new patch that removes all of the volatile markers in
the tree that seemed obviously unnecessary to me.
[0] https://postgr.es/m/aZX2oUcKf7IzHnnK%40nathan
--
nathan
^ permalink raw reply [nested|flat] 153+ messages in thread
* Re: remove unnecessary volatile qualifiers
@ 2026-07-06 11:58 Heikki Linnakangas <[email protected]>
parent: Nathan Bossart <[email protected]>
0 siblings, 1 reply; 153+ messages in thread
From: Heikki Linnakangas @ 2026-07-06 11:58 UTC (permalink / raw)
To: Nathan Bossart <[email protected]>; pgsql-hackers
On 01/07/2026 00:47, Nathan Bossart wrote:
> I looked into some of these earlier [0], but ended up leaving them alone at
> the time. Here is a new patch that removes all of the volatile markers in
> the tree that seemed obviously unnecessary to me.
Thanks!
> --- a/src/backend/access/transam/clog.c
> +++ b/src/backend/access/transam/clog.c
> @@ -450,7 +450,7 @@ static bool
> TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
> XLogRecPtr lsn, int64 pageno)
> {
> - volatile PROC_HDR *procglobal = ProcGlobal;
> + PROC_HDR *procglobal = ProcGlobal;
> PGPROC *proc = MyProc;
> uint32 nextidx;
> uint32 wakeidx;
You might want to get rid of the local variable altogether and just
refer to ProcGlobal directly..
> @@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
> {
> uint64 local_gen;
> uint64 shared_gen;
> - volatile uint32 flags;
> + uint32 flags;
>
> Assert(MyProcSignalSlot);
>
Are you sure about this one? 'flags' is used in the PG_TRY/CATCH block
that follows. It is modified in the PG_TRY(), here:
>
> /*
> * To avoid an infinite loop, we must always unset the bit in
> * flags.
> */
> BARRIER_CLEAR_BIT(flags, type);
and read later in the PG_CATCH() block.
The rest looks OK to me.
- Heikki
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* [PATCH v2 1/1] Remove unnecessary volatile qualifiers.
@ 2026-07-06 15:24 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:24 UTC (permalink / raw)
This commit cleans up volatile qualifiers that fit the below
criteria:
* Accesses to shared memory protected by a spinlock or LWLock.
Before commit 0709b7ee72, callers had to use volatile when
accessing spinlock-protected shared memory. Since spinlock
acquire/release became compiler barriers, and because LWLocks
provide the same guarantee, that is no longer necessary. These
either predate that change or were cargo-culted from code that did.
* Pointers used only to find the address of a member. The volatile
qualifier only affects accesses made by dereferencing the pointer,
so it is unnecessary there.
* Accesses to struct members that are marked volatile in the struct
definition. There's no need to mark these pointers volatile,
either.
* Leftovers from removed PG_TRY blocks. These were marked volatile
to protect a value that is modified inside a PG_TRY block and used
afterward, but the PG_TRY has since been removed.
---
src/backend/access/transam/clog.c | 7 +++---
src/backend/catalog/index.c | 2 +-
src/backend/commands/async.c | 4 ++--
src/backend/replication/syncrep.c | 19 +++++++---------
src/backend/storage/ipc/procsignal.c | 8 +++----
src/backend/storage/ipc/shm_toc.c | 31 ++++++++++++---------------
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/storage/lmgr/proc.c | 3 +--
src/test/modules/test_shm_mq/setup.c | 4 ++--
src/test/modules/test_shm_mq/worker.c | 2 +-
10 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 75012d4b8f0..6f7f6b86eb6 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -450,7 +450,6 @@ static bool
TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
XLogRecPtr lsn, int64 pageno)
{
- volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc = MyProc;
uint32 nextidx;
uint32 wakeidx;
@@ -493,7 +492,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* different from ours. If another group starts to update a page in the
* same bank as ours, they wait until we release the lock.
*/
- nextidx = pg_atomic_read_u32(&procglobal->clogGroupFirst);
+ nextidx = pg_atomic_read_u32(&ProcGlobal->clogGroupFirst);
while (true)
{
@@ -524,7 +523,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
pg_atomic_write_u32(&proc->clogGroupNext, nextidx);
- if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
+ if (pg_atomic_compare_exchange_u32(&ProcGlobal->clogGroupFirst,
&nextidx,
(uint32) MyProcNumber))
break;
@@ -576,7 +575,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
* At this point, any processes trying to do this would create a separate
* group.
*/
- nextidx = pg_atomic_exchange_u32(&procglobal->clogGroupFirst,
+ nextidx = pg_atomic_exchange_u32(&ProcGlobal->clogGroupFirst,
INVALID_PROC_NUMBER);
/* Remember head of list so we can perform wakeups after dropping lock. */
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 9407c357f27..81bba4beac7 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3637,7 +3637,7 @@ reindex_index(const ReindexStmt *stmt, Oid indexId,
int save_sec_context;
int save_nestlevel;
IndexInfo *indexInfo;
- volatile bool skipped_constraint = false;
+ bool skipped_constraint = false;
PGRUsage ru0;
bool progress = ((params->options & REINDEXOPT_REPORT_PROGRESS) != 0);
bool set_tablespace = false;
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index eee8bc29f38..2799f989b96 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -605,7 +605,7 @@ static void CleanupListenersOnExit(void);
static bool IsListeningOn(const char *channel);
static void asyncQueueUnregister(void);
static bool asyncQueueIsFull(void);
-static bool asyncQueueAdvance(volatile QueuePosition *position, int entryLength);
+static bool asyncQueueAdvance(QueuePosition *position, int entryLength);
static void asyncQueueNotificationToEntry(Notification *n, AsyncQueueEntry *qe);
static ListCell *asyncQueueAddEntries(ListCell *nextNotify);
static double asyncQueueUsage(void);
@@ -1968,7 +1968,7 @@ asyncQueueIsFull(void)
* returns true, else false.
*/
static bool
-asyncQueueAdvance(volatile QueuePosition *position, int entryLength)
+asyncQueueAdvance(QueuePosition *position, int entryLength)
{
int64 pageno = QUEUE_POS_PAGE(*position);
int offset = QUEUE_POS_OFFSET(*position);
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index e0e30579c59..d870f09e0a0 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -483,7 +483,6 @@ SyncRepInitConfig(void)
void
SyncRepReleaseWaiters(void)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
XLogRecPtr writePtr;
XLogRecPtr flushPtr;
XLogRecPtr applyPtr;
@@ -558,19 +557,19 @@ SyncRepReleaseWaiters(void)
* Set the lsn first so that when we wake backends they will release up to
* this location.
*/
- if (walsndctl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] < writePtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_WRITE] = writePtr;
numwrite = SyncRepWakeQueue(false, SYNC_REP_WAIT_WRITE);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] < flushPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_FLUSH] = flushPtr;
numflush = SyncRepWakeQueue(false, SYNC_REP_WAIT_FLUSH);
}
- if (walsndctl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
+ if (WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] < applyPtr)
{
- walsndctl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
+ WalSndCtl->lsn[SYNC_REP_WAIT_APPLY] = applyPtr;
numapply = SyncRepWakeQueue(false, SYNC_REP_WAIT_APPLY);
}
@@ -777,8 +776,7 @@ SyncRepGetCandidateStandbys(SyncRepStandbyData **standbys)
n = 0;
for (i = 0; i < max_wal_senders; i++)
{
- volatile WalSnd *walsnd; /* Use volatile pointer to prevent code
- * rearrangement */
+ WalSnd *walsnd;
SyncRepStandbyData *stby;
WalSndState state; /* not included in SyncRepStandbyData */
@@ -915,7 +913,6 @@ SyncRepGetStandbyPriority(void)
static int
SyncRepWakeQueue(bool all, int mode)
{
- volatile WalSndCtlData *walsndctl = WalSndCtl;
int numprocs = 0;
dlist_mutable_iter iter;
@@ -930,7 +927,7 @@ SyncRepWakeQueue(bool all, int mode)
/*
* Assume the queue is ordered by LSN
*/
- if (!all && walsndctl->lsn[mode] < proc->waitLSN)
+ if (!all && WalSndCtl->lsn[mode] < proc->waitLSN)
return numprocs;
/*
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 1397f65f67b..21a77f98c1d 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -295,7 +295,7 @@ CleanupProcSignalState(int status, Datum arg)
int
SendProcSignal(pid_t pid, ProcSignalReason reason, ProcNumber procNumber)
{
- volatile ProcSignalSlot *slot;
+ ProcSignalSlot *slot;
if (procNumber != INVALID_PROC_NUMBER)
{
@@ -380,7 +380,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = 0; i < NumProcSignalSlots; i++)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
}
@@ -406,7 +406,7 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)
*/
for (int i = NumProcSignalSlots - 1; i >= 0; i--)
{
- volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
+ ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
pid_t pid = pg_atomic_read_u32(&slot->pss_pid);
if (pid != 0)
@@ -670,7 +670,7 @@ ResetProcSignalBarrierBits(uint32 flags)
static bool
CheckProcSignal(ProcSignalReason reason)
{
- volatile ProcSignalSlot *slot = MyProcSignalSlot;
+ ProcSignalSlot *slot = MyProcSignalSlot;
if (slot != NULL)
{
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c
index 2f9fbb0a519..2217d48c3d9 100644
--- a/src/backend/storage/ipc/shm_toc.c
+++ b/src/backend/storage/ipc/shm_toc.c
@@ -87,7 +87,6 @@ shm_toc_attach(uint64 magic, void *address)
void *
shm_toc_allocate(shm_toc *toc, Size nbytes)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -103,9 +102,9 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
+ allocated_bytes;
@@ -117,7 +116,7 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of shared memory")));
}
- vtoc->toc_allocated_bytes += nbytes;
+ toc->toc_allocated_bytes += nbytes;
SpinLockRelease(&toc->toc_mutex);
@@ -130,16 +129,15 @@ shm_toc_allocate(shm_toc *toc, Size nbytes)
Size
shm_toc_freespace(shm_toc *toc)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
Size toc_bytes;
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
SpinLockRelease(&toc->toc_mutex);
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry);
@@ -170,7 +168,6 @@ shm_toc_freespace(shm_toc *toc)
void
shm_toc_insert(shm_toc *toc, uint64 key, void *address)
{
- volatile shm_toc *vtoc = toc;
Size total_bytes;
Size allocated_bytes;
Size nentry;
@@ -183,14 +180,14 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
SpinLockAcquire(&toc->toc_mutex);
- total_bytes = vtoc->toc_total_bytes;
- allocated_bytes = vtoc->toc_allocated_bytes;
- nentry = vtoc->toc_nentry;
+ total_bytes = toc->toc_total_bytes;
+ allocated_bytes = toc->toc_allocated_bytes;
+ nentry = toc->toc_nentry;
#ifdef USE_ASSERT_CHECKING
/* Verify no duplicate keys */
for (Size i = 0; i < nentry; i++)
- Assert(vtoc->toc_entry[i].key != key);
+ Assert(toc->toc_entry[i].key != key);
#endif
toc_bytes = offsetof(shm_toc, toc_entry) + nentry * sizeof(shm_toc_entry)
@@ -208,8 +205,8 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
}
Assert(offset < total_bytes);
- vtoc->toc_entry[nentry].key = key;
- vtoc->toc_entry[nentry].offset = offset;
+ toc->toc_entry[nentry].key = key;
+ toc->toc_entry[nentry].offset = offset;
/*
* By placing a write barrier after filling in the entry and before
@@ -218,7 +215,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address)
*/
pg_write_barrier();
- vtoc->toc_nentry++;
+ toc->toc_nentry++;
SpinLockRelease(&toc->toc_mutex);
}
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 8d246ed5a4e..5ee80c7632e 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -312,7 +312,7 @@ typedef struct
uint32 count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
} FastPathStrongRelationLockData;
-static volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+static FastPathStrongRelationLockData *FastPathStrongRelationLocks;
static void LockManagerShmemRequest(void *arg);
static void LockManagerShmemInit(void *arg);
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index 7d01c981a1f..87dd289f626 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -660,8 +660,7 @@ InitAuxiliaryProcess(void)
}
/* Mark auxiliary proc as in use by me */
- /* use volatile pointer to prevent code rearrangement */
- ((volatile PGPROC *) auxproc)->pid = MyProcPid;
+ auxproc->pid = MyProcPid;
SpinLockRelease(&ProcGlobal->freeProcsLock);
diff --git a/src/test/modules/test_shm_mq/setup.c b/src/test/modules/test_shm_mq/setup.c
index 4f40a61e3d9..991fe27a7fa 100644
--- a/src/test/modules/test_shm_mq/setup.c
+++ b/src/test/modules/test_shm_mq/setup.c
@@ -38,7 +38,7 @@ static worker_state *setup_background_workers(int nworkers,
dsm_segment *seg);
static void cleanup_background_workers(dsm_segment *seg, Datum arg);
static void wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr);
+ test_shm_mq_header *hdr);
static bool check_worker_status(worker_state *wstate);
/* value cached, fetched from shared memory */
@@ -258,7 +258,7 @@ cleanup_background_workers(dsm_segment *seg, Datum arg)
static void
wait_for_workers_to_become_ready(worker_state *wstate,
- volatile test_shm_mq_header *hdr)
+ test_shm_mq_header *hdr)
{
bool result = false;
diff --git a/src/test/modules/test_shm_mq/worker.c b/src/test/modules/test_shm_mq/worker.c
index e13c05ae5c7..0ba1cfcac47 100644
--- a/src/test/modules/test_shm_mq/worker.c
+++ b/src/test/modules/test_shm_mq/worker.c
@@ -52,7 +52,7 @@ test_shm_mq_main(Datum main_arg)
shm_toc *toc;
shm_mq_handle *inqh;
shm_mq_handle *outqh;
- volatile test_shm_mq_header *hdr;
+ test_shm_mq_header *hdr;
int myworkernumber;
PGPROC *registrant;
--
2.50.1 (Apple Git-155)
--z39t9WErpHrlykOW--
^ permalink raw reply [nested|flat] 153+ messages in thread
* Re: remove unnecessary volatile qualifiers
@ 2026-07-06 15:47 Nathan Bossart <[email protected]>
parent: Heikki Linnakangas <[email protected]>
0 siblings, 1 reply; 153+ messages in thread
From: Nathan Bossart @ 2026-07-06 15:47 UTC (permalink / raw)
To: Heikki Linnakangas <[email protected]>; +Cc: pgsql-hackers
On Mon, Jul 06, 2026 at 02:58:12PM +0300, Heikki Linnakangas wrote:
> On 01/07/2026 00:47, Nathan Bossart wrote:
>> I looked into some of these earlier [0], but ended up leaving them alone at
>> the time. Here is a new patch that removes all of the volatile markers in
>> the tree that seemed obviously unnecessary to me.
>
> Thanks!
Thanks for reviewing.
>> --- a/src/backend/access/transam/clog.c
>> +++ b/src/backend/access/transam/clog.c
>> @@ -450,7 +450,7 @@ static bool
>> TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
>> XLogRecPtr lsn, int64 pageno)
>> {
>> - volatile PROC_HDR *procglobal = ProcGlobal;
>> + PROC_HDR *procglobal = ProcGlobal;
>> PGPROC *proc = MyProc;
>> uint32 nextidx;
>> uint32 wakeidx;
>
> You might want to get rid of the local variable altogether and just refer to
> ProcGlobal directly..
Done.
>> @@ -512,7 +512,7 @@ ProcessProcSignalBarrier(void)
>> {
>> uint64 local_gen;
>> uint64 shared_gen;
>> - volatile uint32 flags;
>> + uint32 flags;
>> Assert(MyProcSignalSlot);
>
> Are you sure about this one? 'flags' is used in the PG_TRY/CATCH block that
> follows. It is modified in the PG_TRY(), here:
>
>>
>> /*
>> * To avoid an infinite loop, we must always unset the bit in
>> * flags.
>> */
>> BARRIER_CLEAR_BIT(flags, type);
>
> and read later in the PG_CATCH() block.
Whoops. You are right. I reverted this part.
--
nathan
^ permalink raw reply [nested|flat] 153+ messages in thread
* Re: remove unnecessary volatile qualifiers
@ 2026-07-07 16:03 Nathan Bossart <[email protected]>
parent: Nathan Bossart <[email protected]>
0 siblings, 0 replies; 153+ messages in thread
From: Nathan Bossart @ 2026-07-07 16:03 UTC (permalink / raw)
To: Heikki Linnakangas <[email protected]>; +Cc: pgsql-hackers
Committed.
--
nathan
^ permalink raw reply [nested|flat] 153+ messages in thread
end of thread, other threads:[~2026-07-07 16:03 UTC | newest]
Thread overview: 153+ messages (download: mbox mbox.gz follow: Atom feed)
-- links below jump to the message on this page --
2023-02-25 21:39 [PATCH v2] WIP: Evaluate arguments of correlated SubPlans in the referencing ExprState Andres Freund <[email protected]>
2023-02-25 21:39 [PATCH v1] WIP: Evaluate arguments of correlated SubPlans in the referencing ExprState Andres Freund <[email protected]>
2026-02-18 16:31 [PATCH v1 1/3] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-04-14 09:59 [PATCH] Teach REPACK to upgrade its lock safely. Antonin Houska <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:41 [PATCH v1 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-06-30 21:47 remove unnecessary volatile qualifiers Nathan Bossart <[email protected]>
2026-07-06 11:58 ` Re: remove unnecessary volatile qualifiers Heikki Linnakangas <[email protected]>
2026-07-06 15:47 ` Re: remove unnecessary volatile qualifiers Nathan Bossart <[email protected]>
2026-07-07 16:03 ` Re: remove unnecessary volatile qualifiers Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
2026-07-06 15:24 [PATCH v2 1/1] Remove unnecessary volatile qualifiers. Nathan Bossart <[email protected]>
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