From 1f7772bd927c49727bc84277fa62373fa3e573e1 Mon Sep 17 00:00:00 2001 From: Nathan Bossart Date: Wed, 22 Jul 2026 11:32:57 -0400 Subject: [PATCH v2 5/9] convert PROC_HDR->startupBufferPinWaitBuf to an atomic --- src/backend/storage/lmgr/proc.c | 12 +++--------- src/include/storage/proc.h | 2 +- 2 files changed, 4 insertions(+), 10 deletions(-) diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c index f973494abb1..5be06073ea1 100644 --- a/src/backend/storage/lmgr/proc.c +++ b/src/backend/storage/lmgr/proc.c @@ -239,7 +239,7 @@ ProcGlobalShmemInit(void *arg) dlist_init(&ProcGlobal->autovacFreeProcs); dlist_init(&ProcGlobal->bgworkerFreeProcs); dlist_init(&ProcGlobal->walsenderFreeProcs); - ProcGlobal->startupBufferPinWaitBuf = InvalidBuffer; + pg_atomic_init_u32(&ProcGlobal->startupBufferPinWaitBuf, InvalidBuffer); pg_atomic_init_u32(&ProcGlobal->avLauncherProc, INVALID_PROC_NUMBER); pg_atomic_init_u32(&ProcGlobal->walwriterProc, INVALID_PROC_NUMBER); pg_atomic_init_u32(&ProcGlobal->checkpointerProc, INVALID_PROC_NUMBER); @@ -768,10 +768,7 @@ InitAuxiliaryProcess(void) void SetStartupBufferPinWaitBuf(Buffer buffer) { - /* use volatile pointer to prevent code rearrangement */ - volatile PROC_HDR *procglobal = ProcGlobal; - - procglobal->startupBufferPinWaitBuf = buffer; + pg_atomic_write_u32(&ProcGlobal->startupBufferPinWaitBuf, buffer); } /* @@ -780,10 +777,7 @@ SetStartupBufferPinWaitBuf(Buffer buffer) Buffer GetStartupBufferPinWaitBuf(void) { - /* use volatile pointer to prevent code rearrangement */ - volatile PROC_HDR *procglobal = ProcGlobal; - - return procglobal->startupBufferPinWaitBuf; + return pg_atomic_read_u32(&ProcGlobal->startupBufferPinWaitBuf); } /* diff --git a/src/include/storage/proc.h b/src/include/storage/proc.h index 4c3f431b4eb..abe40001d9a 100644 --- a/src/include/storage/proc.h +++ b/src/include/storage/proc.h @@ -500,7 +500,7 @@ typedef struct PROC_HDR /* Current shared estimate of appropriate spins_per_delay value */ int spins_per_delay; /* Buffer that Startup process waits for pin on, or InvalidBuffer */ - Buffer startupBufferPinWaitBuf; + pg_atomic_uint32 startupBufferPinWaitBuf; } PROC_HDR; extern PGDLLIMPORT PROC_HDR *ProcGlobal; -- 2.50.1 (Apple Git-155)