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Avoid palloc(0) when MaxBackends = 1.

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This commit is contained in:
Tom Lane 2002-10-03 19:17:55 +00:00
parent 9886a46e76
commit edf497dec9
1 changed files with 5 additions and 3 deletions
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8
src/backend/storage/lmgr/deadlock.c
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@ -12,7 +12,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/deadlock.c,v 1.13 2002/09/04 20:31:25 momjian Exp $ * $Header: /cvsroot/pgsql/src/backend/storage/lmgr/deadlock.c,v 1.14 2002/10/03 19:17:55 tgl Exp $
* *
* Interface: * Interface:
* *
@ -125,9 +125,11 @@ InitDeadLockChecking(void)
* We need to consider rearranging at most MaxBackends/2 wait queues * We need to consider rearranging at most MaxBackends/2 wait queues
* (since it takes at least two waiters in a queue to create a soft * (since it takes at least two waiters in a queue to create a soft
* edge), and the expanded form of the wait queues can't involve more * edge), and the expanded form of the wait queues can't involve more
* than MaxBackends total waiters. * than MaxBackends total waiters. (But avoid palloc(0) if
* MaxBackends = 1.)
*/ */
waitOrders = (WAIT_ORDER *) palloc((MaxBackends / 2) * sizeof(WAIT_ORDER)); waitOrders = (WAIT_ORDER *)
palloc(((MaxBackends + 1) / 2) * sizeof(WAIT_ORDER));
waitOrderProcs = (PGPROC **) palloc(MaxBackends * sizeof(PGPROC *)); waitOrderProcs = (PGPROC **) palloc(MaxBackends * sizeof(PGPROC *));
/* /*