/*
* TransactionIdDidCommit
* True iff transaction associated with the identifier did commit.
*
* Note:
* Assumes transaction identifier is valid.
*/
bool /* true if given transaction committed */
TransactionIdDidCommit(TransactionId transactionId)
{
XidStatus xidstatus;
xidstatus = TransactionLogFetch(transactionId);
/*
* If it's marked committed, it's committed.
*/
if (xidstatus == TRANSACTION_STATUS_COMMITTED)
#ifdef PGXC
{
syncGXID_GTM((GlobalTransactionId)transactionId);
#endif
return true;
#ifdef PGXC
}
#endif
/*
* If it's marked subcommitted, we have to check the parent recursively.
* However, if it's older than TransactionXmin, we can't look at
* pg_subtrans; instead assume that the parent crashed without cleaning up
* its children.
*
* Originally we Assert'ed that the result of SubTransGetParent was not
* zero. However with the introduction of prepared transactions, there can
* be a window just after database startup where we do not have complete
* knowledge in pg_subtrans of the transactions after TransactionXmin.
* StartupSUBTRANS() has ensured that any missing information will be
* zeroed. Since this case should not happen under normal conditions, it
* seems reasonable to emit a WARNING for it.
*/
if (xidstatus == TRANSACTION_STATUS_SUB_COMMITTED)
{
TransactionId parentXid;
if (TransactionIdPrecedes(transactionId, TransactionXmin))
return false;
parentXid = SubTransGetParent(transactionId);
if (!TransactionIdIsValid(parentXid))
{
elog(WARNING, "no pg_subtrans entry for subcommitted XID %u",
transactionId);
return false;
}
return TransactionIdDidCommit(parentXid);
}
/*
* It's not committed.
*/
return false;
}
/*
* For given Transaction ID, check if transaction is committed or aborted
*/
Datum
pgxc_is_committed(PG_FUNCTION_ARGS)
{
TransactionId tid = (TransactionId) PG_GETARG_UINT32(0);
XidStatus xidstatus;
xidstatus = TransactionLogFetch(tid);
if (xidstatus == TRANSACTION_STATUS_COMMITTED)
PG_RETURN_BOOL(true);
else if (xidstatus == TRANSACTION_STATUS_ABORTED)
PG_RETURN_BOOL(false);
else
PG_RETURN_NULL();
}
/*
* TransactionIdDidAbort
* True iff transaction associated with the identifier did abort.
*
* Note:
* Assumes transaction identifier is valid.
*/
bool /* true if given transaction aborted */
TransactionIdDidAbort(TransactionId transactionId)
{
XidStatus xidstatus;
xidstatus = TransactionLogFetch(transactionId);
/*
* If it's marked aborted, it's aborted.
*/
if (xidstatus == TRANSACTION_STATUS_ABORTED)
return true;
/*
* If it's marked subcommitted, we have to check the parent recursively.
* However, if it's older than TransactionXmin, we can't look at
* pg_subtrans; instead assume that the parent crashed without cleaning up
* its children.
*/
if (xidstatus == TRANSACTION_STATUS_SUB_COMMITTED)
{
TransactionId parentXid;
if (TransactionIdPrecedes(transactionId, TransactionXmin))
return true;
parentXid = SubTransGetParent(transactionId);
if (!TransactionIdIsValid(parentXid))
{
/* see notes in TransactionIdDidCommit */
elog(WARNING, "no pg_subtrans entry for subcommitted XID %u",
transactionId);
return true;
}
return TransactionIdDidAbort(parentXid);
}
/*
* It's not aborted.
*/
return false;
}