コード例 #1
0
ファイル: transam.c プロジェクト: TesterRandolph/postgres-x2
/*
 * 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;
}
コード例 #2
0
ファイル: transam.c プロジェクト: hl0103/pgxc
/*
 * 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();
}
コード例 #3
0
ファイル: transam.c プロジェクト: AnLingm/gpdb
/*
 * 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;
}