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Adjust GetLockConflicts() so that it uses TopMemoryContext when 

executed InHotStandby. Cleaner solution than using malloc or palloc
depending upon situation, as proposed by Tom.
This commit is contained in:
Simon Riggs 2010-01-29 19:45:12 +00:00
parent 6d2bc0a6cf
commit 29eedd3122
1 changed files with 9 additions and 15 deletions
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24
src/backend/storage/lmgr/lock.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lock.c,v 1.192 2010/01/28 10:05:37 sriggs Exp $
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lock.c,v 1.193 2010/01/29 19:45:12 sriggs Exp $
*
* NOTES
* A lock table is a shared memory hash table. When
@ -1790,7 +1790,7 @@ LockReassignCurrentOwner(void)
VirtualTransactionId *
GetLockConflicts(const LOCKTAG *locktag, LOCKMODE lockmode)
{
static VirtualTransactionId *vxids = NULL;
static VirtualTransactionId *vxids;
LOCKMETHODID lockmethodid = locktag->locktag_lockmethodid;
LockMethod lockMethodTable;
LOCK *lock;
@ -1810,24 +1810,18 @@ GetLockConflicts(const LOCKTAG *locktag, LOCKMODE lockmode)
/*
* Allocate memory to store results, and fill with InvalidVXID. We only
* need enough space for MaxBackends + a terminator, since prepared xacts
* don't count.
* don't count. InHotStandby allocate once in TopMemoryContext.
*/
if (!InHotStandby)
vxids = (VirtualTransactionId *)
palloc0(sizeof(VirtualTransactionId) * (MaxBackends + 1));
else
if (InHotStandby)
{
if (vxids == NULL)
{
vxids = (VirtualTransactionId *)
malloc(sizeof(VirtualTransactionId) * (MaxBackends + 1));
if (vxids == NULL)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
}
MemoryContextAlloc(TopMemoryContext,
sizeof(VirtualTransactionId) * (MaxBackends + 1));
}
else
vxids = (VirtualTransactionId *)
palloc0(sizeof(VirtualTransactionId) * (MaxBackends + 1));
/*
* Look up the lock object matching the tag.