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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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13
src/backend/access/transam/varsup.c
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@ -6,7 +6,7 @@
* Copyright (c) 2000-2003, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/varsup.c,v 1.55 2004/01/26 19:15:59 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/varsup.c,v 1.56 2004/07/01 00:49:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -14,6 +14,7 @@
#include "postgres.h"
#include "access/clog.h"
#include "access/subtrans.h"
#include "access/transam.h"
#include "storage/ipc.h"
#include "storage/proc.h"
@ -30,7 +31,7 @@ VariableCache ShmemVariableCache = NULL;
* Allocate the next XID for my new transaction.
*/
TransactionId
GetNewTransactionId(void)
GetNewTransactionId(bool isSubXact)
{
TransactionId xid;
@ -52,8 +53,11 @@ GetNewTransactionId(void)
* commit a later XID before we zero the page. Fortunately, a page of
* the commit log holds 32K or more transactions, so we don't have to
* do this very often.
*
* Extend pg_subtrans too.
*/
ExtendCLOG(xid);
ExtendSUBTRANS(xid);
/*
* Now advance the nextXid counter. This must not happen until after
@ -82,8 +86,11 @@ GetNewTransactionId(void)
* its own spinlock used only for fetching/storing that PGPROC's xid.
* (SInvalLock would then mean primarily that PGPROCs couldn't be added/
* removed while holding the lock.)
*
* We don't want a subtransaction to update the stored Xid; we'll check
* if a transaction Xid is a running subxact by checking pg_subtrans.
*/
if (MyProc != NULL)
if (MyProc != NULL && !isSubXact)
MyProc->xid = xid;
LWLockRelease(XidGenLock);