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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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44
src/backend/access/gist/gistscan.c
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@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gist/gistscan.c,v 1.51 2004/01/07 18:56:23 neilc Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gistscan.c,v 1.52 2004/07/01 00:49:27 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -41,6 +41,7 @@ static void adjustiptr(IndexScanDesc s, ItemPointer iptr,
typedef struct GISTScanListData
{
IndexScanDesc gsl_scan;
TransactionId gsl_creatingXid;
struct GISTScanListData *gsl_next;
} GISTScanListData;
@ -223,6 +224,7 @@ gistregscan(IndexScanDesc s)
l = (GISTScanList) palloc(sizeof(GISTScanListData));
l->gsl_scan = s;
l->gsl_creatingXid = GetCurrentTransactionId();
l->gsl_next = GISTScans;
GISTScans = l;
}
@ -271,6 +273,46 @@ AtEOXact_gist(void)
GISTScans = NULL;
}
/*
* AtEOSubXact_gist() --- clean up gist subsystem at subxact abort or commit.
*
* This is here because it needs to touch this module's static var GISTScans.
*/
void
AtEOSubXact_gist(TransactionId childXid)
{
GISTScanList l;
GISTScanList prev;
GISTScanList next;
/*
* Note: these actions should only be necessary during xact abort; but
* they can't hurt during a commit.
*/
/*
* Forget active scans that were started in this subtransaction.
*/
prev = NULL;
for (l = GISTScans; l != NULL; l = next)
{
next = l->gsl_next;
if (l->gsl_creatingXid == childXid)
{
if (prev == NULL)
GISTScans = next;
else
prev->gsl_next = next;
pfree(l);
/* prev does not change */
}
else
prev = l;
}
}
void
gistadjscans(Relation rel, int op, BlockNumber blkno, OffsetNumber offnum)
{