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Replace BackendIds with 0-based ProcNumbers

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Now that BackendId was just another index into the proc array, it was
redundant with the 0-based proc numbers used in other places. Replace
all usage of backend IDs with proc numbers.

The only place where the term "backend id" remains is in a few pgstat
functions that expose backend IDs at the SQL level. Those IDs are now
in fact 0-based ProcNumbers too, but the documentation still calls
them "backend ids". That term still seems appropriate to describe what
the numbers are, so I let it be.

One user-visible effect is that pg_temp_0 is now a valid temp schema
name, for backend with ProcNumber 0.

Reviewed-by: Andres Freund
Discussion: https://www.postgresql.org/message-id/8171f1aa-496f-46a6-afc3-c46fe7a9b407@iki.fi
This commit is contained in:
Heikki Linnakangas
2024-03-03 19:38:22 +02:00
parent ab355e3a88
commit 024c521117
71 changed files with 571 additions and 579 deletions
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4
src/backend/replication/logical/applyparallelworker.c
View File

@ -845,7 +845,7 @@ pa_shutdown(int code, Datum arg)
{
SendProcSignal(MyLogicalRepWorker->leader_pid,
PROCSIG_PARALLEL_APPLY_MESSAGE,
InvalidBackendId);
INVALID_PROC_NUMBER);
dsm_detach((dsm_segment *) DatumGetPointer(arg));
}
@ -934,7 +934,7 @@ ParallelApplyWorkerMain(Datum main_arg)
pq_redirect_to_shm_mq(seg, error_mqh);
pq_set_parallel_leader(MyLogicalRepWorker->leader_pid,
InvalidBackendId);
INVALID_PROC_NUMBER);
MyLogicalRepWorker->last_send_time = MyLogicalRepWorker->last_recv_time =
MyLogicalRepWorker->reply_time = 0;

2
src/backend/replication/slot.c
View File

@ -1651,7 +1651,7 @@ InvalidatePossiblyObsoleteSlot(ReplicationSlotInvalidationCause cause,
if (MyBackendType == B_STARTUP)
(void) SendProcSignal(active_pid,
PROCSIG_RECOVERY_CONFLICT_LOGICALSLOT,
InvalidBackendId);
INVALID_PROC_NUMBER);
else
(void) kill(active_pid, SIGTERM);

2
src/backend/replication/walsender.c
View File

@ -3646,7 +3646,7 @@ WalSndInitStopping(void)
if (pid == 0)
continue;
SendProcSignal(pid, PROCSIG_WALSND_INIT_STOPPING, InvalidBackendId);
SendProcSignal(pid, PROCSIG_WALSND_INIT_STOPPING, INVALID_PROC_NUMBER);
}
}