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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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10
src/backend/libpq/pqmq.c
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@@ -26,7 +26,7 @@
static shm_mq_handle *pq_mq_handle;
static bool pq_mq_busy = false;
static pid_t pq_mq_parallel_leader_pid = 0;
static pid_t pq_mq_parallel_leader_backend_id = InvalidBackendId;
static pid_t pq_mq_parallel_leader_proc_number = INVALID_PROC_NUMBER;
static void pq_cleanup_redirect_to_shm_mq(dsm_segment *seg, Datum arg);
static void mq_comm_reset(void);
@@ -75,11 +75,11 @@ pq_cleanup_redirect_to_shm_mq(dsm_segment *seg, Datum arg)
* message data via the shm_mq.
*/
void
pq_set_parallel_leader(pid_t pid, BackendId backend_id)
pq_set_parallel_leader(pid_t pid, ProcNumber procNumber)
{
Assert(PqCommMethods == &PqCommMqMethods);
pq_mq_parallel_leader_pid = pid;
pq_mq_parallel_leader_backend_id = backend_id;
pq_mq_parallel_leader_proc_number = procNumber;
}
static void
@@ -168,13 +168,13 @@ mq_putmessage(char msgtype, const char *s, size_t len)
if (IsLogicalParallelApplyWorker())
SendProcSignal(pq_mq_parallel_leader_pid,
PROCSIG_PARALLEL_APPLY_MESSAGE,
pq_mq_parallel_leader_backend_id);
pq_mq_parallel_leader_proc_number);
else
{
Assert(IsParallelWorker());
SendProcSignal(pq_mq_parallel_leader_pid,
PROCSIG_PARALLEL_MESSAGE,
pq_mq_parallel_leader_backend_id);
pq_mq_parallel_leader_proc_number);
}
}