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Use condition variables for ProcSignalBarriers.

Instead of a poll/sleep loop, use a condition variable for precisewake-up whenever a backend's pss_barrierGeneration advances.Discussion:https://postgr.es/m/CA+hUKGLdemy2gBm80kz20GTe6hNVwoErE8KwcJk6-U56oStjtg@mail.gmail.com

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src/backend/storage/ipc
- procsignal.c

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+14

-20

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`‎src/backend/storage/ipc/procsignal.c‎`

Lines changed: 14 additions & 20 deletions

Original file line number	Diff line number	Diff line change
`@@ -23,6 +23,7 @@`
`23`	`23`	`#include"miscadmin.h"`
`24`	`24`	`#include"pgstat.h"`
`25`	`25`	`#include"replication/walsender.h"`
	`26`	`+#include"storage/condition_variable.h"`
`26`	`27`	`#include"storage/ipc.h"`
`27`	`28`	`#include"storage/latch.h"`
`28`	`29`	`#include"storage/proc.h"`
`@@ -59,10 +60,11 @@`
`59`	`60`	`*/`
`60`	`61`	`typedefstruct`
`61`	`62`	`{`
`62`		`-pid_tpss_pid;`
`63`		`-sig_atomic_tpss_signalFlags[NUM_PROCSIGNALS];`
	`63`	`+volatilepid_tpss_pid;`
	`64`	`+volatilesig_atomic_tpss_signalFlags[NUM_PROCSIGNALS];`
`64`	`65`	`pg_atomic_uint64pss_barrierGeneration;`
`65`	`66`	`pg_atomic_uint32pss_barrierCheckMask;`
	`67`	`+ConditionVariablepss_barrierCV;`
`66`	`68`	`}ProcSignalSlot;`
`67`	`69`
`68`	`70`	`/*`
`@@ -93,7 +95,7 @@ typedef struct`
`93`	`95`	`((flags) &= ~(((uint32) 1) << (uint32) (type)))`
`94`	`96`
`95`	`97`	`staticProcSignalHeader*ProcSignal=NULL;`
`96`		`-staticvolatileProcSignalSlot*MyProcSignalSlot=NULL;`
	`98`	`+staticProcSignalSlot*MyProcSignalSlot=NULL;`
`97`	`99`
`98`	`100`	`staticboolCheckProcSignal(ProcSignalReasonreason);`
`99`	`101`	`staticvoidCleanupProcSignalState(intstatus,Datumarg);`
`@@ -142,6 +144,7 @@ ProcSignalShmemInit(void)`
`142`	`144`	`MemSet(slot->pss_signalFlags,0,sizeof(slot->pss_signalFlags));`
`143`	`145`	`pg_atomic_init_u64(&slot->pss_barrierGeneration,PG_UINT64_MAX);`
`144`	`146`	`pg_atomic_init_u32(&slot->pss_barrierCheckMask,0);`
	`147`	`+ConditionVariableInit(&slot->pss_barrierCV);`
`145`	`148`	`}`
`146`	`149`	`}`
`147`	`150`	`}`
`@@ -156,7 +159,7 @@ ProcSignalShmemInit(void)`
`156`	`159`	`void`
`157`	`160`	`ProcSignalInit(intpss_idx)`
`158`	`161`	`{`
`159`		`-volatileProcSignalSlot*slot;`
	`162`	`+ProcSignalSlot*slot;`
`160`	`163`	`uint64barrier_generation;`
`161`	`164`
`162`	`165`	`Assert(pss_idx >=1&&pss_idx <=NumProcSignalSlots);`
`@@ -208,7 +211,7 @@ static void`
`208`	`211`	`CleanupProcSignalState(intstatus,Datumarg)`
`209`	`212`	`{`
`210`	`213`	`intpss_idx=DatumGetInt32(arg);`
`211`		`-volatileProcSignalSlot*slot;`
	`214`	`+ProcSignalSlot*slot;`
`212`	`215`
`213`	`216`	`slot=&ProcSignal->psh_slot[pss_idx-1];`
`214`	`217`	`Assert(slot==MyProcSignalSlot);`
`@@ -237,6 +240,7 @@ CleanupProcSignalState(int status, Datum arg)`
`237`	`240`	`* no barrier waits block on it.`
`238`	`241`	`*/`
`239`	`242`	`pg_atomic_write_u64(&slot->pss_barrierGeneration,PG_UINT64_MAX);`
	`243`	`+ConditionVariableBroadcast(&slot->pss_barrierCV);`
`240`	`244`
`241`	`245`	`slot->pss_pid=0;`
`242`	`246`	`}`
`@@ -391,13 +395,11 @@ EmitProcSignalBarrier(ProcSignalBarrierType type)`
`391`	`395`	`void`
`392`	`396`	`WaitForProcSignalBarrier(uint64generation)`
`393`	`397`	`{`
`394`		`-longtimeout=125L;`
`395`		`-`
`396`	`398`	`Assert(generation <=pg_atomic_read_u64(&ProcSignal->psh_barrierGeneration));`
`397`	`399`
`398`	`400`	`for (inti=NumProcSignalSlots-1;i >=0;i--)`
`399`	`401`	`{`
`400`		`-volatileProcSignalSlot*slot=&ProcSignal->psh_slot[i];`
	`402`	`+ProcSignalSlot*slot=&ProcSignal->psh_slot[i];`
`401`	`403`	`uint64oldval;`
`402`	`404`
`403`	`405`	`/*`
`@@ -409,20 +411,11 @@ WaitForProcSignalBarrier(uint64 generation)`
`409`	`411`	`oldval=pg_atomic_read_u64(&slot->pss_barrierGeneration);`
`410`	`412`	`while (oldval<generation)`
`411`	`413`	`{`
`412`		`-intevents;`
`413`		`-`
`414`		`-CHECK_FOR_INTERRUPTS();`
`415`		`-`
`416`		`-events=`
`417`		`-WaitLatch(MyLatch,`
`418`		`-WL_LATCH_SET \|WL_TIMEOUT \|WL_EXIT_ON_PM_DEATH,`
`419`		`-timeout,WAIT_EVENT_PROC_SIGNAL_BARRIER);`
`420`		`-ResetLatch(MyLatch);`
`421`		`-`
	`414`	`+ConditionVariableSleep(&slot->pss_barrierCV,`
	`415`	`+WAIT_EVENT_PROC_SIGNAL_BARRIER);`
`422`	`416`	`oldval=pg_atomic_read_u64(&slot->pss_barrierGeneration);`
`423`		`-if (events&WL_TIMEOUT)`
`424`		`-timeout=Min(timeout*2,1000L);`
`425`	`417`	`}`
	`418`	`+ConditionVariableCancelSleep();`
`426`	`419`	`}`
`427`	`420`
`428`	`421`	`/*`
`@@ -589,6 +582,7 @@ ProcessProcSignalBarrier(void)`
`589`	`582`	`* next called.`
`590`	`583`	`*/`
`591`	`584`	`pg_atomic_write_u64(&MyProcSignalSlot->pss_barrierGeneration,shared_gen);`
	`585`	`+ConditionVariableBroadcast(&MyProcSignalSlot->pss_barrierCV);`
`592`	`586`	`}`
`593`	`587`
`594`	`588`	`/*`

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`‎src/backend/storage/ipc/procsignal.c‎`

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