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Revert the addition of GetMaxBackends() and related stuff.

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This reverts commits 0147fc7, 4567596, aa64f23, and 5ecd018.
There is no longer agreement that introducing this function
was the right way to address the problem. The consensus now
seems to favor trying to make a correct value for MaxBackends
available to mdules executing their _PG_init() functions.

Nathan Bossart

Discussion: http://postgr.es/m/20220323045229.i23skfscdbvrsuxa@jrouhaud
This commit is contained in:
Robert Haas
2022-04-12 14:45:23 -04:00
parent 2c9381840f
commit 7fc0e7de9f
19 changed files with 142 additions and 227 deletions
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5
src/backend/utils/adt/lockfuncs.c
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@@ -559,14 +559,13 @@ pg_safe_snapshot_blocking_pids(PG_FUNCTION_ARGS)
int *blockers;
int num_blockers;
Datum *blocker_datums;
int max_backends = GetMaxBackends();
/* A buffer big enough for any possible blocker list without truncation */
blockers = (int *) palloc(max_backends * sizeof(int));
blockers = (int *) palloc(MaxBackends * sizeof(int));
/* Collect a snapshot of processes waited for by GetSafeSnapshot */
num_blockers =
GetSafeSnapshotBlockingPids(blocked_pid, blockers, max_backends);
GetSafeSnapshotBlockingPids(blocked_pid, blockers, MaxBackends);
/* Convert int array to Datum array */
if (num_blockers > 0)