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Guard against malloc failure. Also, don't examine segP->lastBackend

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until we hold the spinlock.
This commit is contained in:
Tom Lane 2001-06-01 20:07:16 +00:00
parent d8adce8983
commit ddd96e1f21
1 changed files with 13 additions and 4 deletions
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17
src/backend/storage/ipc/sinval.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinval.c,v 1.31 2001/05/18 21:24:20 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinval.c,v 1.32 2001/06/01 20:07:16 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -283,15 +283,24 @@ GetSnapshotData(bool serializable)
int index;
int count = 0;
if (snapshot == NULL)
elog(ERROR, "Memory exhausted in GetSnapshotData");
snapshot->xmin = GetCurrentTransactionId();
SpinAcquire(SInvalLock);
/*
* There can be no more than lastBackend active transactions, so this
* is enough space:
*/
snapshot->xip = (TransactionId *)
malloc(segP->lastBackend * sizeof(TransactionId));
snapshot->xmin = GetCurrentTransactionId();
SpinAcquire(SInvalLock);
if (snapshot->xip == NULL)
{
SpinRelease(SInvalLock);
elog(ERROR, "Memory exhausted in GetSnapshotData");
}
/*
* Unfortunately, we have to call ReadNewTransactionId() after