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Refactor postmaster child process launching

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Introduce new postmaster_child_launch() function that deals with the
differences in EXEC_BACKEND mode.

Refactor the mechanism of passing information from the parent to child
process. Instead of using different command-line arguments when
launching the child process in EXEC_BACKEND mode, pass a
variable-length blob of startup data along with all the global
variables. The contents of that blob depend on the kind of child
process being launched. In !EXEC_BACKEND mode, we use the same blob,
but it's simply inherited from the parent to child process.

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
2024-03-18 11:35:08 +02:00
parent f1baed18bc
commit aafc05de1b
28 changed files with 676 additions and 1008 deletions
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4
src/include/replication/slotsync.h
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@@ -26,9 +26,7 @@ extern PGDLLIMPORT char *PrimarySlotName;
extern char *CheckAndGetDbnameFromConninfo(void);
extern bool ValidateSlotSyncParams(int elevel);
#ifdef EXEC_BACKEND
extern void ReplSlotSyncWorkerMain(int argc, char *argv[]) pg_attribute_noreturn();
#endif
extern void ReplSlotSyncWorkerMain(char *startup_data, size_t startup_data_len) pg_attribute_noreturn();
extern int StartSlotSyncWorker(void);
extern void ShutDownSlotSync(void);

2
src/include/replication/walreceiver.h
View File

@@ -483,7 +483,7 @@ walrcv_clear_result(WalRcvExecResult *walres)
}
/* prototypes for functions in walreceiver.c */
extern void WalReceiverMain(void) pg_attribute_noreturn();
extern void WalReceiverMain(char *startup_data, size_t startup_data_len) pg_attribute_noreturn();
extern void ProcessWalRcvInterrupts(void);
extern void WalRcvForceReply(void);