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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/backend/replication/walreceiver.c
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@ -193,7 +193,7 @@ WalReceiverMain(void)
TimeLineID startpointTLI;
TimeLineID primaryTLI;
bool first_stream;
WalRcvData *walrcv = WalRcv;
WalRcvData *walrcv;
TimestampTz now;
char *err;
char *sender_host = NULL;
@ -203,6 +203,7 @@ WalReceiverMain(void)
* WalRcv should be set up already (if we are a backend, we inherit this
* by fork() or EXEC_BACKEND mechanism from the postmaster).
*/
walrcv = WalRcv;
Assert(walrcv != NULL);
/*