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Refactor CreateSharedMemoryAndSemaphores

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For clarity, have separate functions for *creating* the shared memory
and semaphores at postmaster or single-user backend startup, and
for *attaching* to existing shared memory structures in EXEC_BACKEND
case. CreateSharedMemoryAndSemaphores() is now called only at
postmaster startup, and a new AttachSharedMemoryStructs() function is
called at backend startup in EXEC_BACKEND mode.

Reviewed-by: Tristan Partin, Andres Freund
Discussion: https://www.postgresql.org/message-id/7a59b073-5b5b-151e-7ed3-8b01ff7ce9ef@iki.fi
This commit is contained in:
Heikki Linnakangas
2023-12-03 16:09:42 +02:00
parent b19890d49d
commit 69d903367c
5 changed files with 117 additions and 89 deletions
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3
src/include/storage/ipc.h
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@@ -79,6 +79,9 @@ extern PGDLLIMPORT shmem_startup_hook_type shmem_startup_hook;
extern Size CalculateShmemSize(int *num_semaphores);
extern void CreateSharedMemoryAndSemaphores(void);
#ifdef EXEC_BACKEND
extern void AttachSharedMemoryStructs(void);
#endif
extern void InitializeShmemGUCs(void);
#endif /* IPC_H */