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Code Issues Releases Wiki Activity

Minor improvement in SI overflow logic: try to delete 

expired messages before concluding that we really have buffer overflow.
This commit is contained in:
Tom Lane 1999-09-09 14:56:06 +00:00
parent 9e713ddb99
commit 8b8db01517
1 changed files with 14 additions and 4 deletions
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18
src/backend/storage/ipc/sinvaladt.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinvaladt.c,v 1.25 1999/09/06 19:37:38 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinvaladt.c,v 1.26 1999/09/09 14:56:06 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -228,9 +228,19 @@ SIInsertDataEntry(SISeg *segP, SharedInvalidData *data)
/* Is the buffer full? */
if (numMsgs >= MAXNUMMESSAGES)
{
/* Yes, so force reset */
SISetProcStateInvalid(segP);
return false;
/*
* Don't panic just yet: slowest backend might have consumed some
* messages but not yet have done SIDelExpiredDataEntries() to
* advance minMsgNum. So, make sure minMsgNum is up-to-date.
*/
SIDelExpiredDataEntries(segP);
numMsgs = segP->maxMsgNum - segP->minMsgNum;
if (numMsgs >= MAXNUMMESSAGES)
{
/* Yup, it's definitely full, no choice but to reset */
SISetProcStateInvalid(segP);
return false;
}
}
/*