agora inbox for [email protected]
help / color / mirror / Atom feed[PATCH v51 10/10] CheckLogicalDecodingRequirements: be specific about which GUC is limiting
201+ messages / 2 participants
[nested] [flat]
* [PATCH v51 10/10] CheckLogicalDecodingRequirements: be specific about which GUC is limiting
@ 2026-04-03 19:01 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Álvaro Herrera @ 2026-04-03 19:01 UTC (permalink / raw)
---
src/backend/commands/repack_worker.c | 3 ++-
src/backend/replication/logical/logical.c | 8 +++++---
src/backend/replication/logical/logicalfuncs.c | 2 +-
src/backend/replication/slot.c | 18 ++++++++++++------
src/backend/replication/slotfuncs.c | 11 ++++++-----
src/backend/replication/walsender.c | 5 +++--
src/include/replication/logical.h | 3 ++-
src/include/replication/slot.h | 2 +-
8 files changed, 32 insertions(+), 20 deletions(-)
diff --git a/src/backend/commands/repack_worker.c b/src/backend/commands/repack_worker.c
index 610592a05b0..ca827223845 100644
--- a/src/backend/commands/repack_worker.c
+++ b/src/backend/commands/repack_worker.c
@@ -224,7 +224,7 @@ repack_setup_logical_decoding(Oid relid)
* Make sure we can use logical decoding.
*/
CheckSlotPermissions();
- CheckLogicalDecodingRequirements();
+ CheckLogicalDecodingRequirements(true);
/*
* A single backend should not execute multiple REPACK commands at a time,
@@ -252,6 +252,7 @@ repack_setup_logical_decoding(Oid relid)
ctx = CreateInitDecodingContext(REPL_PLUGIN_NAME,
NIL,
true,
+ true,
InvalidXLogRecPtr,
XL_ROUTINE(.page_read = read_local_xlog_page,
.segment_open = wal_segment_open,
diff --git a/src/backend/replication/logical/logical.c b/src/backend/replication/logical/logical.c
index f20a0fe70ad..a08aece5731 100644
--- a/src/backend/replication/logical/logical.c
+++ b/src/backend/replication/logical/logical.c
@@ -108,9 +108,9 @@ static void LoadOutputPlugin(OutputPluginCallbacks *callbacks, const char *plugi
* decoding.
*/
void
-CheckLogicalDecodingRequirements(void)
+CheckLogicalDecodingRequirements(bool repack)
{
- CheckSlotRequirements();
+ CheckSlotRequirements(repack);
/*
* NB: Adding a new requirement likely means that RestoreSlotFromDisk()
@@ -305,6 +305,7 @@ StartupDecodingContext(List *output_plugin_options,
* output_plugin_options -- contains options passed to the output plugin
* need_full_snapshot -- if true, must obtain a snapshot able to read all
* tables; if false, one that can read only catalogs is acceptable.
+ * for_repack -- if true, we're going to be decoding for REPACK.
* restart_lsn -- if given as invalid, it's this routine's responsibility to
* mark WAL as reserved by setting a convenient restart_lsn for the slot.
* Otherwise, we set for decoding to start from the given LSN without
@@ -325,6 +326,7 @@ LogicalDecodingContext *
CreateInitDecodingContext(const char *plugin,
List *output_plugin_options,
bool need_full_snapshot,
+ bool for_repack,
XLogRecPtr restart_lsn,
XLogReaderRoutine *xl_routine,
LogicalOutputPluginWriterPrepareWrite prepare_write,
@@ -341,7 +343,7 @@ CreateInitDecodingContext(const char *plugin,
* On a standby, this check is also required while creating the slot.
* Check the comments in the function.
*/
- CheckLogicalDecodingRequirements();
+ CheckLogicalDecodingRequirements(for_repack);
/* shorter lines... */
slot = MyReplicationSlot;
diff --git a/src/backend/replication/logical/logicalfuncs.c b/src/backend/replication/logical/logicalfuncs.c
index 9760818941d..512013b0ef0 100644
--- a/src/backend/replication/logical/logicalfuncs.c
+++ b/src/backend/replication/logical/logicalfuncs.c
@@ -115,7 +115,7 @@ pg_logical_slot_get_changes_guts(FunctionCallInfo fcinfo, bool confirm, bool bin
CheckSlotPermissions();
- CheckLogicalDecodingRequirements();
+ CheckLogicalDecodingRequirements(false);
if (PG_ARGISNULL(0))
ereport(ERROR,
diff --git a/src/backend/replication/slot.c b/src/backend/replication/slot.c
index 2c6c6773ad2..13004ed547a 100644
--- a/src/backend/replication/slot.c
+++ b/src/backend/replication/slot.c
@@ -1669,19 +1669,25 @@ CheckLogicalSlotExists(void)
* slots.
*/
void
-CheckSlotRequirements(void)
+CheckSlotRequirements(bool repack)
{
+ int limit;
+
/*
* NB: Adding a new requirement likely means that RestoreSlotFromDisk()
* needs the same check.
*/
- /* XXX we should be able to check exactly which type of slot we need */
- if (max_replication_slots + max_repack_replication_slots == 0)
+ if (repack)
+ limit = max_repack_replication_slots;
+ else
+ limit = max_replication_slots;
+
+ if (limit == 0)
ereport(ERROR,
- (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
- errmsg("replication slots can only be used if \"%s\" > 0 or \"%s\" > 0",
- "max_replication_slots", "max_repack_replication_slots")));
+ errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
+ errmsg("replication slots can only be used if \"%s\" > 0",
+ repack ? "max_repack_replication_slots" : "max_replication_slots"));
if (wal_level < WAL_LEVEL_REPLICA)
ereport(ERROR,
diff --git a/src/backend/replication/slotfuncs.c b/src/backend/replication/slotfuncs.c
index 78dd3c4ea66..16fbd383735 100644
--- a/src/backend/replication/slotfuncs.c
+++ b/src/backend/replication/slotfuncs.c
@@ -90,7 +90,7 @@ pg_create_physical_replication_slot(PG_FUNCTION_ARGS)
CheckSlotPermissions();
- CheckSlotRequirements();
+ CheckSlotRequirements(false);
create_physical_replication_slot(NameStr(*name),
immediately_reserve,
@@ -164,6 +164,7 @@ create_logical_replication_slot(char *name, char *plugin,
*/
ctx = CreateInitDecodingContext(plugin, NIL,
false, /* just catalogs is OK */
+ false, /* not repack */
restart_lsn,
XL_ROUTINE(.page_read = read_local_xlog_page,
.segment_open = wal_segment_open,
@@ -203,7 +204,7 @@ pg_create_logical_replication_slot(PG_FUNCTION_ARGS)
CheckSlotPermissions();
- CheckLogicalDecodingRequirements();
+ CheckLogicalDecodingRequirements(false);
create_logical_replication_slot(NameStr(*name),
NameStr(*plugin),
@@ -240,7 +241,7 @@ pg_drop_replication_slot(PG_FUNCTION_ARGS)
CheckSlotPermissions();
- CheckSlotRequirements();
+ CheckSlotRequirements(false);
ReplicationSlotDrop(NameStr(*name), true);
@@ -648,9 +649,9 @@ copy_replication_slot(FunctionCallInfo fcinfo, bool logical_slot)
CheckSlotPermissions();
if (logical_slot)
- CheckLogicalDecodingRequirements();
+ CheckLogicalDecodingRequirements(false);
else
- CheckSlotRequirements();
+ CheckSlotRequirements(false);
LWLockAcquire(ReplicationSlotControlLock, LW_SHARED);
diff --git a/src/backend/replication/walsender.c b/src/backend/replication/walsender.c
index 75ef3419a15..9d7d675fa96 100644
--- a/src/backend/replication/walsender.c
+++ b/src/backend/replication/walsender.c
@@ -1240,7 +1240,7 @@ CreateReplicationSlot(CreateReplicationSlotCmd *cmd)
Assert(cmd->kind == REPLICATION_KIND_LOGICAL);
- CheckLogicalDecodingRequirements();
+ CheckLogicalDecodingRequirements(false);
/*
* Initially create persistent slot as ephemeral - that allows us to
@@ -1309,6 +1309,7 @@ CreateReplicationSlot(CreateReplicationSlotCmd *cmd)
Assert(IsLogicalDecodingEnabled());
ctx = CreateInitDecodingContext(cmd->plugin, NIL, need_full_snapshot,
+ false,
InvalidXLogRecPtr,
XL_ROUTINE(.page_read = logical_read_xlog_page,
.segment_open = WalSndSegmentOpen,
@@ -1466,7 +1467,7 @@ StartLogicalReplication(StartReplicationCmd *cmd)
QueryCompletion qc;
/* make sure that our requirements are still fulfilled */
- CheckLogicalDecodingRequirements();
+ CheckLogicalDecodingRequirements(false);
Assert(!MyReplicationSlot);
diff --git a/src/include/replication/logical.h b/src/include/replication/logical.h
index bc9d4ece672..bc075b16741 100644
--- a/src/include/replication/logical.h
+++ b/src/include/replication/logical.h
@@ -115,11 +115,12 @@ typedef struct LogicalDecodingContext
} LogicalDecodingContext;
-extern void CheckLogicalDecodingRequirements(void);
+extern void CheckLogicalDecodingRequirements(bool repack);
extern LogicalDecodingContext *CreateInitDecodingContext(const char *plugin,
List *output_plugin_options,
bool need_full_snapshot,
+ bool for_repack,
XLogRecPtr restart_lsn,
XLogReaderRoutine *xl_routine,
LogicalOutputPluginWriterPrepareWrite prepare_write,
diff --git a/src/include/replication/slot.h b/src/include/replication/slot.h
index c316a01a807..489af7d8d6c 100644
--- a/src/include/replication/slot.h
+++ b/src/include/replication/slot.h
@@ -378,7 +378,7 @@ extern void ReplicationSlotDropAtPubNode(WalReceiverConn *wrconn, char *slotname
extern void StartupReplicationSlots(void);
extern void CheckPointReplicationSlots(bool is_shutdown);
-extern void CheckSlotRequirements(void);
+extern void CheckSlotRequirements(bool repack);
extern void CheckSlotPermissions(void);
extern ReplicationSlotInvalidationCause
GetSlotInvalidationCause(const char *cause_name);
--
2.47.3
--r2slln3zpmilwu22--
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
* [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics
@ 2026-07-09 20:04 Nathan Bossart <[email protected]>
0 siblings, 0 replies; 201+ messages in thread
From: Nathan Bossart @ 2026-07-09 20:04 UTC (permalink / raw)
---
src/backend/utils/sort/tuplesort.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index c0e7527b9ca..81e0b2816d6 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -104,6 +104,7 @@
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "pg_trace.h"
+#include "port/atomics.h"
#include "port/pg_bitutils.h"
#include "storage/shmem.h"
#include "utils/guc.h"
@@ -340,9 +341,6 @@ struct Tuplesortstate
*/
struct Sharedsort
{
- /* mutex protects all fields prior to tapes */
- slock_t mutex;
-
/*
* currentWorker generates ordinal identifier numbers for parallel sort
* workers. These start from 0, and are always gapless.
@@ -351,8 +349,8 @@ struct Sharedsort
* is equal to state.nParticipants within the leader, leader is ready to
* merge worker runs.
*/
- int currentWorker;
- int workersFinished;
+ pg_atomic_uint32 currentWorker;
+ pg_atomic_uint32 workersFinished;
/* Temporary file space */
SharedFileSet fileset;
@@ -3252,9 +3250,8 @@ tuplesort_initialize_shared(Sharedsort *shared, int nWorkers, dsm_segment *seg)
Assert(nWorkers > 0);
- SpinLockInit(&shared->mutex);
- shared->currentWorker = 0;
- shared->workersFinished = 0;
+ pg_atomic_init_u32(&shared->currentWorker, 0);
+ pg_atomic_init_u32(&shared->workersFinished, 0);
SharedFileSetInit(&shared->fileset, seg);
shared->nTapes = nWorkers;
for (i = 0; i < nWorkers; i++)
@@ -3291,16 +3288,9 @@ tuplesort_attach_shared(Sharedsort *shared, dsm_segment *seg)
static int
worker_get_identifier(Tuplesortstate *state)
{
- Sharedsort *shared = state->shared;
- int worker;
-
Assert(WORKER(state));
- SpinLockAcquire(&shared->mutex);
- worker = shared->currentWorker++;
- SpinLockRelease(&shared->mutex);
-
- return worker;
+ return pg_atomic_fetch_add_u32(&state->shared->currentWorker, 1);
}
/*
@@ -3342,10 +3332,8 @@ worker_freeze_result_tape(Tuplesortstate *state)
LogicalTapeFreeze(state->result_tape, &output);
/* Store properties of output tape, and update finished worker count */
- SpinLockAcquire(&shared->mutex);
shared->tapes[state->worker] = output;
- shared->workersFinished++;
- SpinLockRelease(&shared->mutex);
+ pg_atomic_fetch_add_u32(&shared->workersFinished, 1);
}
/*
@@ -3387,9 +3375,7 @@ leader_takeover_tapes(Tuplesortstate *state)
Assert(LEADER(state));
Assert(nParticipants >= 1);
- SpinLockAcquire(&shared->mutex);
- workersFinished = shared->workersFinished;
- SpinLockRelease(&shared->mutex);
+ workersFinished = pg_atomic_read_membarrier_u32(&shared->workersFinished);
if (nParticipants != workersFinished)
elog(ERROR, "cannot take over tapes before all workers finish");
--
2.50.1 (Apple Git-155)
--Ot5x3ffkWEuxilWO
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v1-0006-convert-SharedFileSet-refcnt-to-an-atomic.patch
^ permalink raw reply [nested|flat] 201+ messages in thread
end of thread, other threads:[~2026-07-09 20:04 UTC | newest]
Thread overview: 201+ messages (download: mbox mbox.gz follow: Atom feed)
-- links below jump to the message on this page --
2026-04-03 19:01 [PATCH v51 10/10] CheckLogicalDecodingRequirements: be specific about which GUC is limiting Álvaro Herrera <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
2026-07-09 20:04 [PATCH v1 5/8] convert Sharedsort->{currentWorker,workersFinished} to atomics Nathan Bossart <[email protected]>
This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox