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Nested transactions. There is still much left to do, especially on the

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performance front, but with feature freeze upon us I think it's time to
drive a stake in the ground and say that this will be in 7.5.

Alvaro Herrera, with some help from Tom Lane.
This commit is contained in:
Tom Lane
2004-07-01 00:52:04 +00:00
parent 4c9aa572fa
commit 573a71a5da
74 changed files with 4516 additions and 1144 deletions
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20
src/backend/storage/lmgr/lmgr.c
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@@ -8,13 +8,14 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lmgr.c,v 1.63 2004/05/28 05:13:04 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lmgr.c,v 1.64 2004/07/01 00:50:59 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/subtrans.h"
#include "access/transam.h"
#include "access/xact.h"
#include "catalog/catalog.h"
@@ -333,19 +334,21 @@ XactLockTableInsert(TransactionId xid)
* XactLockTableWait
*
* Wait for the specified transaction to commit or abort.
* We actually wait on the topmost transaction of the transaction tree.
*/
void
XactLockTableWait(TransactionId xid)
{
LOCKTAG tag;
TransactionId myxid = GetCurrentTransactionId();
TransactionId waitXid = SubTransGetTopmostTransaction(xid);
Assert(!TransactionIdEquals(xid, myxid));
Assert(!SubTransXidsHaveCommonAncestor(waitXid, myxid));
MemSet(&tag, 0, sizeof(tag));
tag.relId = XactLockTableId;
tag.dbId = InvalidOid;
tag.objId.xid = xid;
tag.objId.xid = waitXid;
if (!LockAcquire(LockTableId, &tag, myxid,
ShareLock, false))
@@ -355,8 +358,13 @@ XactLockTableWait(TransactionId xid)
/*
* Transaction was committed/aborted/crashed - we have to update
* pg_clog if transaction is still marked as running.
* pg_clog if transaction is still marked as running. If it's a
* subtransaction, we can update the parent status too.
*/
if (!TransactionIdDidCommit(xid) && !TransactionIdDidAbort(xid))
TransactionIdAbort(xid);
if (!TransactionIdDidCommit(waitXid) && !TransactionIdDidAbort(waitXid))
{
TransactionIdAbort(waitXid);
if (waitXid != xid)
TransactionIdAbort(xid);
}
}