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Ensure backwards compatibility for GetStableLatestTransactionId()

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This commit is contained in:
Simon Riggs
2012-05-12 13:25:34 +01:00
parent 2c1382d96c
commit 436af241c8
1 changed files with 8 additions and 6 deletions
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14
src/backend/access/transam/xact.c
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@ -392,11 +392,10 @@ GetCurrentTransactionIdIfAny(void)
return CurrentTransactionState->transactionId;
}
/*
* GetStableLatestTransactionIdIfAny
* GetStableLatestTransactionId
*
* Get the latest XID once and then return same value for rest of transaction.
* Get the XID once and then return same value for rest of transaction.
* Acts as a useful reference point for maintenance tasks.
*/
TransactionId
@ -405,13 +404,16 @@ GetStableLatestTransactionId(void)
static LocalTransactionId lxid = InvalidLocalTransactionId;
static TransactionId stablexid = InvalidTransactionId;
if (lxid != MyProc->lxid ||
!TransactionIdIsValid(stablexid))
if (lxid != MyProc->lxid)
{
lxid = MyProc->lxid;
stablexid = ReadNewTransactionId();
stablexid = GetTopTransactionIdIfAny();
if (!TransactionIdIsValid(stablexid))
stablexid = ReadNewTransactionId();
}
Assert(TransactionIdIsValid(stablexid));
return stablexid;
}