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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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12
src/backend/postmaster/pgarch.c
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@@ -79,7 +79,7 @@
/* Shared memory area for archiver process */
typedef struct PgArchData
{
int pgprocno; /* pgprocno of archiver process */
int pgprocno; /* proc number of archiver process */
/*
* Forces a directory scan in pgarch_readyXlog().
@@ -170,7 +170,7 @@ PgArchShmemInit(void)
{
/* First time through, so initialize */
MemSet(PgArch, 0, PgArchShmemSize());
PgArch->pgprocno = INVALID_PGPROCNO;
PgArch->pgprocno = INVALID_PROC_NUMBER;
pg_atomic_init_u32(&PgArch->force_dir_scan, 0);
}
}
@@ -236,8 +236,8 @@ PgArchiverMain(void)
on_shmem_exit(pgarch_die, 0);
/*
* Advertise our pgprocno so that backends can use our latch to wake us up
* while we're sleeping.
* Advertise our proc number so that backends can use our latch to wake us
* up while we're sleeping.
*/
PgArch->pgprocno = MyProcNumber;
@@ -271,7 +271,7 @@ PgArchWakeup(void)
* process' (or no process') latch. Even in that case the archiver will
* be relaunched shortly and will start archiving.
*/
if (arch_pgprocno != INVALID_PGPROCNO)
if (arch_pgprocno != INVALID_PROC_NUMBER)
SetLatch(&ProcGlobal->allProcs[arch_pgprocno].procLatch);
}
@@ -741,7 +741,7 @@ pgarch_archiveDone(char *xlog)
static void
pgarch_die(int code, Datum arg)
{
PgArch->pgprocno = INVALID_PGPROCNO;
PgArch->pgprocno = INVALID_PROC_NUMBER;
}
/*