agora inbox for pgsql-hackers@postgresql.org  

help / color / mirror / Atom feed

[PATCH v6 2/7] Row pattern recognition patch (parse/analysis).
319+ messages / 2 participants
[nested] [flat]

* [PATCH v6 2/7] Row pattern recognition patch (parse/analysis).
@ 2023-09-12 05:22 Tatsuo Ishii <ishii@postgresql.org>
  0 siblings, 0 replies; 319+ messages in thread

From: Tatsuo Ishii @ 2023-09-12 05:22 UTC (permalink / raw)

---
 src/backend/parser/parse_agg.c    |   7 +
 src/backend/parser/parse_clause.c | 292 +++++++++++++++++++++++++++++-
 src/backend/parser/parse_expr.c   |   4 +
 src/backend/parser/parse_func.c   |   3 +
 4 files changed, 305 insertions(+), 1 deletion(-)

diff --git a/src/backend/parser/parse_agg.c b/src/backend/parser/parse_agg.c
index 85cd47b7ae..aa7a1cee80 100644
--- a/src/backend/parser/parse_agg.c
+++ b/src/backend/parser/parse_agg.c
@@ -564,6 +564,10 @@ check_agglevels_and_constraints(ParseState *pstate, Node *expr)
 			errkind = true;
 			break;
 
+		case EXPR_KIND_RPR_DEFINE:
+			errkind = true;
+			break;
+
 			/*
 			 * There is intentionally no default: case here, so that the
 			 * compiler will warn if we add a new ParseExprKind without
@@ -953,6 +957,9 @@ transformWindowFuncCall(ParseState *pstate, WindowFunc *wfunc,
 		case EXPR_KIND_CYCLE_MARK:
 			errkind = true;
 			break;
+		case EXPR_KIND_RPR_DEFINE:
+			errkind = true;
+			break;
 
 			/*
 			 * There is intentionally no default: case here, so that the
diff --git a/src/backend/parser/parse_clause.c b/src/backend/parser/parse_clause.c
index 334b9b42bd..60020a7025 100644
--- a/src/backend/parser/parse_clause.c
+++ b/src/backend/parser/parse_clause.c
@@ -100,7 +100,10 @@ static WindowClause *findWindowClause(List *wclist, const char *name);
 static Node *transformFrameOffset(ParseState *pstate, int frameOptions,
 								  Oid rangeopfamily, Oid rangeopcintype, Oid *inRangeFunc,
 								  Node *clause);
-
+static void transformRPR(ParseState *pstate, WindowClause *wc, WindowDef *windef, List **targetlist);
+static List *transformDefineClause(ParseState *pstate, WindowClause *wc, WindowDef *windef, List **targetlist);
+static void transformPatternClause(ParseState *pstate, WindowClause *wc, WindowDef *windef);
+static List *transformMeasureClause(ParseState *pstate, WindowClause *wc, WindowDef *windef);
 
 /*
  * transformFromClause -
@@ -2950,6 +2953,10 @@ transformWindowDefinitions(ParseState *pstate,
 											 rangeopfamily, rangeopcintype,
 											 &wc->endInRangeFunc,
 											 windef->endOffset);
+
+		/* Process Row Pattern Recognition related clauses */
+		transformRPR(pstate, wc, windef, targetlist);
+
 		wc->runCondition = NIL;
 		wc->winref = winref;
 
@@ -3815,3 +3822,286 @@ transformFrameOffset(ParseState *pstate, int frameOptions,
 
 	return node;
 }
+
+/*
+ * transformRPR
+ *		Process Row Pattern Recognition related clauses
+ */
+static void
+transformRPR(ParseState *pstate, WindowClause *wc, WindowDef *windef, List **targetlist)
+{
+	/*
+	 * Window definition exists?
+	 */
+	if (windef == NULL)
+		return;
+
+	/*
+	 * Row Pattern Common Syntax clause exists?
+	 */
+	if (windef->rpCommonSyntax == NULL)
+		return;
+
+	/* Check Frame option. Frame must start at current row */
+	if ((wc->frameOptions & FRAMEOPTION_START_CURRENT_ROW) == 0)
+		ereport(ERROR,
+				(errcode(ERRCODE_SYNTAX_ERROR),
+				 errmsg("FRAME must start at current row when row patttern recognition is used")));
+
+	/* Transform AFTER MACH SKIP TO clause */
+	wc->rpSkipTo = windef->rpCommonSyntax->rpSkipTo;
+
+	/* Transform SEEK or INITIAL clause */
+	wc->initial = windef->rpCommonSyntax->initial;
+
+	/* Transform DEFINE clause into list of TargetEntry's */
+	wc->defineClause = transformDefineClause(pstate, wc, windef, targetlist);
+
+	/* Check PATTERN clause and copy to patternClause */
+	transformPatternClause(pstate, wc, windef);
+
+	/* Transform MEASURE clause */
+	transformMeasureClause(pstate, wc, windef);
+}
+
+/*
+ * transformDefineClause Process DEFINE clause and transform ResTarget into
+ *		list of TargetEntry.
+ *
+ * XXX we only support column reference in row pattern definition search
+ * condition, e.g. "price". <row pattern definition variable name>.<column
+ * reference> is not supported, e.g. "A.price".
+ */
+static List *
+transformDefineClause(ParseState *pstate, WindowClause *wc, WindowDef *windef, List **targetlist)
+{
+	/* DEFINE variable name initials */
+	static	char	*defineVariableInitials = "abcdefghijklmnopqrstuvwxyz";
+
+	ListCell		*lc, *l;
+	ResTarget		*restarget, *r;
+	List			*restargets;
+	char			*name;
+	int				initialLen;
+	int				i;
+
+	/*
+	 * If Row Definition Common Syntax exists, DEFINE clause must exist.
+	 * (the raw parser should have already checked it.)
+	 */
+	Assert(windef->rpCommonSyntax->rpDefs != NULL);
+
+	/*
+	 * Check and add "A AS A IS TRUE" if pattern variable is missing in DEFINE
+	 * per the SQL standard.
+	 */
+	restargets = NIL;
+	foreach(lc, windef->rpCommonSyntax->rpPatterns)
+	{
+		A_Expr	*a;
+		bool	found = false;
+
+		if (!IsA(lfirst(lc), A_Expr))
+			ereport(ERROR,
+					errmsg("node type is not A_Expr"));
+
+		a = (A_Expr *)lfirst(lc);
+		name = strVal(a->lexpr);
+
+		foreach(l, windef->rpCommonSyntax->rpDefs)
+		{
+			restarget = (ResTarget *)lfirst(l);
+
+			if (!strcmp(restarget->name, name))
+			{
+				found = true;
+				break;
+			}
+		}
+
+		if (!found)
+		{
+			/*
+			 * "name" is missing. So create "name AS name IS TRUE" ResTarget
+			 * node and add it to the temporary list.
+			 */
+			A_Const	   *n;
+
+			restarget = makeNode(ResTarget);
+			n = makeNode(A_Const);
+			n->val.boolval.type = T_Boolean;
+			n->val.boolval.boolval = true;
+			n->location = -1;
+			restarget->name = pstrdup(name);
+			restarget->indirection = NIL;
+			restarget->val = (Node *)n;
+			restarget->location = -1;
+			restargets = lappend((List *)restargets, restarget);
+		}
+	}
+
+	if (list_length(restargets) >= 1)
+	{
+		/* add missing DEFINEs */
+		windef->rpCommonSyntax->rpDefs = list_concat(windef->rpCommonSyntax->rpDefs,
+													 restargets);
+		list_free(restargets);
+	}
+
+	/*
+	 * Check for duplicate row pattern definition variables.  The standard
+	 * requires that no two row pattern definition variable names shall be
+	 * equivalent.
+	 */
+	restargets = NIL;
+	foreach(lc, windef->rpCommonSyntax->rpDefs)
+	{
+		restarget = (ResTarget *)lfirst(lc);
+		name = restarget->name;
+
+		/*
+		 * Add DEFINE expression (Restarget->val) to the targetlist as a
+		 * TargetEntry if it does not exist yet. Planner will add the column
+		 * ref var node to the outer plan's target list later on. This makes
+		 * DEFINE expression could access the outer tuple while evaluating
+		 * PATTERN.
+		 *
+		 * XXX: adding whole expressions of DEFINE to the plan.targetlist is
+		 * not so good, because it's not necessary to evalute the expression
+		 * in the target list while running the plan. We should extract the
+		 * var nodes only then add them to the plan.targetlist.
+		 */
+		findTargetlistEntrySQL99(pstate, (Node *)restarget->val, targetlist, EXPR_KIND_RPR_DEFINE);
+
+		/*
+		 * Make sure that the row pattern definition search condition is a
+		 * boolean expression.
+		 */
+		transformWhereClause(pstate, restarget->val,
+							 EXPR_KIND_RPR_DEFINE, "DEFINE");
+
+		foreach(l, restargets)
+		{
+			char		*n;
+
+			r = (ResTarget *) lfirst(l);
+			n = r->name;
+
+			if (!strcmp(n, name))
+				ereport(ERROR,
+						(errcode(ERRCODE_SYNTAX_ERROR),
+						 errmsg("row pattern definition variable name \"%s\" appears more than once in DEFINE clause",
+								name),
+						 parser_errposition(pstate, exprLocation((Node *)r))));
+		}
+		restargets = lappend(restargets, restarget);
+	}
+	list_free(restargets);
+
+	/*
+	 * Create list of row pattern DEFINE variable name's initial.
+	 * We assign [a-z] to them (up to 26 variable names are allowed).
+	 */
+	restargets = NIL;
+	i = 0;
+	initialLen = strlen(defineVariableInitials);
+
+	foreach(lc, windef->rpCommonSyntax->rpDefs)
+	{
+		char	initial[2];
+
+		restarget = (ResTarget *)lfirst(lc);
+		name = restarget->name;
+
+		if (i >= initialLen)
+		{
+			ereport(ERROR,
+					(errcode(ERRCODE_SYNTAX_ERROR),
+					 errmsg("number of row pattern definition variable names exceeds %d", initialLen),
+					 parser_errposition(pstate, exprLocation((Node *)restarget))));
+		}
+		initial[0] = defineVariableInitials[i++];
+		initial[1] = '\0';
+		wc->defineInitial = lappend(wc->defineInitial, makeString(pstrdup(initial)));
+	}
+
+	return transformTargetList(pstate, windef->rpCommonSyntax->rpDefs,
+							   EXPR_KIND_RPR_DEFINE);
+}
+
+/*
+ * transformPatternClause
+ *		Process PATTERN clause and return PATTERN clause in the raw parse tree
+ */
+static void
+transformPatternClause(ParseState *pstate, WindowClause *wc, WindowDef *windef)
+{
+	ListCell	*lc, *l;
+
+	/*
+	 * Row Pattern Common Syntax clause exists?
+	 */
+	if (windef->rpCommonSyntax == NULL)
+		return;
+
+	/*
+	 * Primary row pattern variable names in PATTERN clause must appear in
+	 * DEFINE clause as row pattern definition variable names.
+	 */
+	wc->patternVariable = NIL;
+	wc->patternRegexp = NIL;
+	foreach(lc, windef->rpCommonSyntax->rpPatterns)
+	{
+		A_Expr	*a;
+		char	*name;
+		char	*regexp;
+		bool	found = false;
+
+		if (!IsA(lfirst(lc), A_Expr))
+			ereport(ERROR,
+					errmsg("node type is not A_Expr"));
+
+		a = (A_Expr *)lfirst(lc);
+		name = strVal(a->lexpr);
+
+		foreach(l, windef->rpCommonSyntax->rpDefs)
+		{
+			ResTarget	*restarget = (ResTarget *)lfirst(l);
+
+			if (!strcmp(restarget->name, name))
+			{
+				found = true;
+				break;
+			}
+		}
+
+		if (!found)
+		{
+			ereport(ERROR,
+					(errcode(ERRCODE_SYNTAX_ERROR),
+					 errmsg("primary row pattern variable name \"%s\" does not appear in DEFINE clause",
+							name),
+					 parser_errposition(pstate, exprLocation((Node *)a))));
+		}
+		wc->patternVariable = lappend(wc->patternVariable, makeString(pstrdup(name)));
+		regexp = strVal(lfirst(list_head(a->name)));
+		wc->patternRegexp = lappend(wc->patternRegexp, makeString(pstrdup(regexp)));
+	}
+}
+
+/*
+ * transformMeasureClause
+ *		Process MEASURE clause
+ *	XXX MEASURE clause is not supported yet
+ */
+static List *
+transformMeasureClause(ParseState *pstate, WindowClause *wc, WindowDef *windef)
+{
+	if (windef->rowPatternMeasures == NIL)
+		return NIL;
+
+	ereport(ERROR,
+			(errcode(ERRCODE_SYNTAX_ERROR),
+			 errmsg("%s","MEASURE clause is not supported yet"),
+			 parser_errposition(pstate, exprLocation((Node *)windef->rowPatternMeasures))));
+}
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index 64c582c344..18b58ac263 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -557,6 +557,7 @@ transformColumnRef(ParseState *pstate, ColumnRef *cref)
 		case EXPR_KIND_COPY_WHERE:
 		case EXPR_KIND_GENERATED_COLUMN:
 		case EXPR_KIND_CYCLE_MARK:
+		case EXPR_KIND_RPR_DEFINE:
 			/* okay */
 			break;
 
@@ -1770,6 +1771,7 @@ transformSubLink(ParseState *pstate, SubLink *sublink)
 		case EXPR_KIND_VALUES:
 		case EXPR_KIND_VALUES_SINGLE:
 		case EXPR_KIND_CYCLE_MARK:
+		case EXPR_KIND_RPR_DEFINE:
 			/* okay */
 			break;
 		case EXPR_KIND_CHECK_CONSTRAINT:
@@ -3149,6 +3151,8 @@ ParseExprKindName(ParseExprKind exprKind)
 			return "GENERATED AS";
 		case EXPR_KIND_CYCLE_MARK:
 			return "CYCLE";
+		case EXPR_KIND_RPR_DEFINE:
+			return "DEFINE";
 
 			/*
 			 * There is intentionally no default: case here, so that the
diff --git a/src/backend/parser/parse_func.c b/src/backend/parser/parse_func.c
index b3f0b6a137..2ff3699538 100644
--- a/src/backend/parser/parse_func.c
+++ b/src/backend/parser/parse_func.c
@@ -2656,6 +2656,9 @@ check_srf_call_placement(ParseState *pstate, Node *last_srf, int location)
 		case EXPR_KIND_CYCLE_MARK:
 			errkind = true;
 			break;
+		case EXPR_KIND_RPR_DEFINE:
+			errkind = true;
+			break;
 
 			/*
 			 * There is intentionally no default: case here, so that the
-- 
2.25.1


----Next_Part(Tue_Sep_12_15_18_43_2023_359)--
Content-Type: Text/X-Patch; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="v6-0003-Row-pattern-recognition-patch-planner.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread

* [PATCH v2 4/6] Introduce pending flag for GUC assign hooks
@ 2025-02-19 16:45 Dmitrii Dolgov <9erthalion6@gmail.com>
  0 siblings, 0 replies; 319+ messages in thread

From: Dmitrii Dolgov @ 2025-02-19 16:45 UTC (permalink / raw)

Currently an assing hook can perform some preprocessing of a new value,
but it cannot change the behavior, which dictates that the new value
will be applied immediately after the hook. Certain GUC options (like
shared_buffers, coming in subsequent patches) may need coordinating work
between backends to change, meaning we cannot apply it right away.

Add a new flag "pending" for an assign hook to allow the hook indicate
exactly that. If the pending flag is set after the hook, the new value
will not be applied and it's handling becomes the hook's implementation
responsibility.

Note, that this also requires changes in the way how GUCs are getting
reported, but the patch does not cover that yet.
---
 src/backend/access/transam/xlog.c    |  2 +-
 src/backend/commands/variable.c      |  2 +-
 src/backend/libpq/pqcomm.c           |  8 ++--
 src/backend/tcop/postgres.c          |  2 +-
 src/backend/utils/misc/guc.c         | 59 +++++++++++++++++++---------
 src/backend/utils/misc/stack_depth.c |  2 +-
 src/include/utils/guc.h              |  2 +-
 src/include/utils/guc_hooks.h        | 16 ++++----
 8 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index f9bf5ba7509..ff82ba0a53d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2188,7 +2188,7 @@ CalculateCheckpointSegments(void)
 }
 
 void
-assign_max_wal_size(int newval, void *extra)
+assign_max_wal_size(int newval, void *extra, bool *pending)
 {
 	max_wal_size_mb = newval;
 	CalculateCheckpointSegments();
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 4ad6e236d69..f24c2a0d252 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1143,7 +1143,7 @@ check_cluster_name(char **newval, void **extra, GucSource source)
  * GUC assign_hook for maintenance_io_concurrency
  */
 void
-assign_maintenance_io_concurrency(int newval, void *extra)
+assign_maintenance_io_concurrency(int newval, void *extra, bool *pending)
 {
 #ifdef USE_PREFETCH
 	/*
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 61ea3722ae2..cdf21847d7e 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -1949,7 +1949,7 @@ pq_settcpusertimeout(int timeout, Port *port)
  * GUC assign_hook for tcp_keepalives_idle
  */
 void
-assign_tcp_keepalives_idle(int newval, void *extra)
+assign_tcp_keepalives_idle(int newval, void *extra, bool *pending)
 {
 	/*
 	 * The kernel API provides no way to test a value without setting it; and
@@ -1982,7 +1982,7 @@ show_tcp_keepalives_idle(void)
  * GUC assign_hook for tcp_keepalives_interval
  */
 void
-assign_tcp_keepalives_interval(int newval, void *extra)
+assign_tcp_keepalives_interval(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivesinterval(newval, MyProcPort);
@@ -2005,7 +2005,7 @@ show_tcp_keepalives_interval(void)
  * GUC assign_hook for tcp_keepalives_count
  */
 void
-assign_tcp_keepalives_count(int newval, void *extra)
+assign_tcp_keepalives_count(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_setkeepalivescount(newval, MyProcPort);
@@ -2028,7 +2028,7 @@ show_tcp_keepalives_count(void)
  * GUC assign_hook for tcp_user_timeout
  */
 void
-assign_tcp_user_timeout(int newval, void *extra)
+assign_tcp_user_timeout(int newval, void *extra, bool *pending)
 {
 	/* See comments in assign_tcp_keepalives_idle */
 	(void) pq_settcpusertimeout(newval, MyProcPort);
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1149d89d7a1..13fb8c31702 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3555,7 +3555,7 @@ check_log_stats(bool *newval, void **extra, GucSource source)
 
 /* GUC assign hook for transaction_timeout */
 void
-assign_transaction_timeout(int newval, void *extra)
+assign_transaction_timeout(int newval, void *extra, bool *pending)
 {
 	if (IsTransactionState())
 	{
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 12192445218..bab1c5d08f6 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1679,6 +1679,7 @@ InitializeOneGUCOption(struct config_generic *gconf)
 				struct config_int *conf = (struct config_int *) gconf;
 				int			newval = conf->boot_val;
 				void	   *extra = NULL;
+				bool 	   pending = false;
 
 				Assert(newval >= conf->min);
 				Assert(newval <= conf->max);
@@ -1687,9 +1688,13 @@ InitializeOneGUCOption(struct config_generic *gconf)
 					elog(FATAL, "failed to initialize %s to %d",
 						 conf->gen.name, newval);
 				if (conf->assign_hook)
-					conf->assign_hook(newval, extra);
-				*conf->variable = conf->reset_val = newval;
-				conf->gen.extra = conf->reset_extra = extra;
+					conf->assign_hook(newval, extra, &pending);
+
+				if (!pending)
+				{
+					*conf->variable = conf->reset_val = newval;
+					conf->gen.extra = conf->reset_extra = extra;
+				}
 				break;
 			}
 		case PGC_REAL:
@@ -2041,13 +2046,18 @@ ResetAllOptions(void)
 			case PGC_INT:
 				{
 					struct config_int *conf = (struct config_int *) gconf;
+					bool 			  pending = false;
 
 					if (conf->assign_hook)
 						conf->assign_hook(conf->reset_val,
-										  conf->reset_extra);
-					*conf->variable = conf->reset_val;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									conf->reset_extra);
+										  conf->reset_extra,
+										  &pending);
+					if (!pending)
+					{
+						*conf->variable = conf->reset_val;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										conf->reset_extra);
+					}
 					break;
 				}
 			case PGC_REAL:
@@ -2424,16 +2434,21 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
 							struct config_int *conf = (struct config_int *) gconf;
 							int			newval = newvalue.val.intval;
 							void	   *newextra = newvalue.extra;
+							bool 	    pending = false;
 
 							if (*conf->variable != newval ||
 								conf->gen.extra != newextra)
 							{
 								if (conf->assign_hook)
-									conf->assign_hook(newval, newextra);
-								*conf->variable = newval;
-								set_extra_field(&conf->gen, &conf->gen.extra,
-												newextra);
-								changed = true;
+									conf->assign_hook(newval, newextra, &pending);
+
+								if (!pending)
+								{
+									*conf->variable = newval;
+									set_extra_field(&conf->gen, &conf->gen.extra,
+													newextra);
+									changed = true;
+								}
 							}
 							break;
 						}
@@ -3850,18 +3865,24 @@ set_config_with_handle(const char *name, config_handle *handle,
 
 				if (changeVal)
 				{
+					bool pending = false;
+
 					/* Save old value to support transaction abort */
 					if (!makeDefault)
 						push_old_value(&conf->gen, action);
 
 					if (conf->assign_hook)
-						conf->assign_hook(newval, newextra);
-					*conf->variable = newval;
-					set_extra_field(&conf->gen, &conf->gen.extra,
-									newextra);
-					set_guc_source(&conf->gen, source);
-					conf->gen.scontext = context;
-					conf->gen.srole = srole;
+						conf->assign_hook(newval, newextra, &pending);
+
+					if (!pending)
+					{
+						*conf->variable = newval;
+						set_extra_field(&conf->gen, &conf->gen.extra,
+										newextra);
+						set_guc_source(&conf->gen, source);
+						conf->gen.scontext = context;
+						conf->gen.srole = srole;
+					}
 				}
 				if (makeDefault)
 				{
diff --git a/src/backend/utils/misc/stack_depth.c b/src/backend/utils/misc/stack_depth.c
index 8f7cf531fbc..ef59ae62008 100644
--- a/src/backend/utils/misc/stack_depth.c
+++ b/src/backend/utils/misc/stack_depth.c
@@ -156,7 +156,7 @@ check_max_stack_depth(int *newval, void **extra, GucSource source)
 
 /* GUC assign hook for max_stack_depth */
 void
-assign_max_stack_depth(int newval, void *extra)
+assign_max_stack_depth(int newval, void *extra, bool *pending)
 {
 	ssize_t		newval_bytes = newval * (ssize_t) 1024;
 
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1233e07d7da..ce9f258100d 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -187,7 +187,7 @@ typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource sourc
 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
 
 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
-typedef void (*GucIntAssignHook) (int newval, void *extra);
+typedef void (*GucIntAssignHook) (int newval, void *extra, bool *pending);
 typedef void (*GucRealAssignHook) (double newval, void *extra);
 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
 typedef void (*GucEnumAssignHook) (int newval, void *extra);
diff --git a/src/include/utils/guc_hooks.h b/src/include/utils/guc_hooks.h
index 951451a9765..3e380f29e5a 100644
--- a/src/include/utils/guc_hooks.h
+++ b/src/include/utils/guc_hooks.h
@@ -81,12 +81,12 @@ extern void assign_log_timezone(const char *newval, void *extra);
 extern const char *show_log_timezone(void);
 extern bool check_maintenance_io_concurrency(int *newval, void **extra,
 											 GucSource source);
-extern void assign_maintenance_io_concurrency(int newval, void *extra);
+extern void assign_maintenance_io_concurrency(int newval, void *extra, bool *pending);
 extern bool check_max_slot_wal_keep_size(int *newval, void **extra,
 										 GucSource source);
-extern void assign_max_wal_size(int newval, void *extra);
+extern void assign_max_wal_size(int newval, void *extra, bool *pending);
 extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
-extern void assign_max_stack_depth(int newval, void *extra);
+extern void assign_max_stack_depth(int newval, void *extra, bool *pending);
 extern bool check_multixact_member_buffers(int *newval, void **extra,
 										   GucSource source);
 extern bool check_multixact_offset_buffers(int *newval, void **extra,
@@ -141,13 +141,13 @@ extern void assign_synchronous_standby_names(const char *newval, void *extra);
 extern void assign_synchronous_commit(int newval, void *extra);
 extern void assign_syslog_facility(int newval, void *extra);
 extern void assign_syslog_ident(const char *newval, void *extra);
-extern void assign_tcp_keepalives_count(int newval, void *extra);
+extern void assign_tcp_keepalives_count(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_count(void);
-extern void assign_tcp_keepalives_idle(int newval, void *extra);
+extern void assign_tcp_keepalives_idle(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_idle(void);
-extern void assign_tcp_keepalives_interval(int newval, void *extra);
+extern void assign_tcp_keepalives_interval(int newval, void *extra, bool *pending);
 extern const char *show_tcp_keepalives_interval(void);
-extern void assign_tcp_user_timeout(int newval, void *extra);
+extern void assign_tcp_user_timeout(int newval, void *extra, bool *pending);
 extern const char *show_tcp_user_timeout(void);
 extern bool check_temp_buffers(int *newval, void **extra, GucSource source);
 extern bool check_temp_tablespaces(char **newval, void **extra,
@@ -163,7 +163,7 @@ extern bool check_transaction_buffers(int *newval, void **extra, GucSource sourc
 extern bool check_transaction_deferrable(bool *newval, void **extra, GucSource source);
 extern bool check_transaction_isolation(int *newval, void **extra, GucSource source);
 extern bool check_transaction_read_only(bool *newval, void **extra, GucSource source);
-extern void assign_transaction_timeout(int newval, void *extra);
+extern void assign_transaction_timeout(int newval, void *extra, bool *pending);
 extern const char *show_unix_socket_permissions(void);
 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
 extern bool check_wal_consistency_checking(char **newval, void **extra,
-- 
2.45.1


--q7xzg7duksj2kgko
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0005-Allow-to-resize-shared-memory-without-restart.patch"



^ permalink  raw  reply  [nested|flat] 319+ messages in thread