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Code Activity

1. xact.c: update comments about changing MyProc->xid and MyProc->xmin.

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2. varsup.c:ReadNewTransactionId(): don't read nextXid from disk -
   this func doesn't allocate next xid, so ShmemVariableCache->nextXid
   may be used (but GetNewTransactionId() must be called first).
3. vacuum.c: change elog(ERROR, "Child item....") to elog(NOTICE) -
   this is not ERROR, proper handling is just not implemented, yet.
4. s_lock.c: increase S_MAX_BUSY by 2 times.
5. shmem.c:GetSnapshotData(): have to call ReadNewTransactionId()
   _after_ SpinAcquire(ShmemIndexLock).
This commit is contained in:
Vadim B. Mikheev
1999-06-06 20:19:35 +00:00
parent 48c1887964
commit 1b812d9358
5 changed files with 44 additions and 26 deletions
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19
src/backend/access/transam/varsup.c
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/transam/varsup.c,v 1.21 1999/06/03 04:41:40 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/access/transam/varsup.c,v 1.22 1999/06/06 20:19:33 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@@ -335,16 +335,13 @@ ReadNewTransactionId(TransactionId *xid)
SpinAcquire(OidGenLockId); /* not good for concurrency... */
if (ShmemVariableCache->xid_count == 0)
{
TransactionId nextid;
VariableRelationGetNextXid(&nextid);
TransactionIdStore(nextid, &(ShmemVariableCache->nextXid));
ShmemVariableCache->xid_count = VAR_XID_PREFETCH;
TransactionIdAdd(&nextid, VAR_XID_PREFETCH);
VariableRelationPutNextXid(nextid);
}
/*
* Note that we don't check is ShmemVariableCache->xid_count equal
* to 0 or not. This will work as long as we don't call
* ReadNewTransactionId() before GetNewTransactionId().
*/
if (ShmemVariableCache->nextXid == 0)
elog(ERROR, "ReadNewTransactionId: ShmemVariableCache->nextXid is not initialized");
TransactionIdStore(ShmemVariableCache->nextXid, xid);