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Ensure backwards compatibility for GetStableLatestTransactionId()

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This commit is contained in:
Simon Riggs 2012-05-12 13:26:10 +01:00
parent afe86a9e73
commit 867540b49c
1 changed files with 8 additions and 6 deletions
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14
src/backend/access/transam/xact.c
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@ -390,11 +390,10 @@ GetCurrentTransactionIdIfAny(void)
return CurrentTransactionState->transactionId; 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. * Acts as a useful reference point for maintenance tasks.
*/ */
TransactionId TransactionId
@ -403,13 +402,16 @@ GetStableLatestTransactionId(void)
static LocalTransactionId lxid = InvalidLocalTransactionId; static LocalTransactionId lxid = InvalidLocalTransactionId;
static TransactionId stablexid = InvalidTransactionId; static TransactionId stablexid = InvalidTransactionId;
if (lxid != MyProc->lxid || if (lxid != MyProc->lxid)
!TransactionIdIsValid(stablexid))
{ {
lxid = MyProc->lxid; lxid = MyProc->lxid;
stablexid = ReadNewTransactionId(); stablexid = GetTopTransactionIdIfAny();
if (!TransactionIdIsValid(stablexid))
stablexid = ReadNewTransactionId();
} }
Assert(TransactionIdIsValid(stablexid));
return stablexid; return stablexid;
} }