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Invent ResourceOwner mechanism as per my recent proposal, and use it to

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keep track of portal-related resources separately from transaction-related
resources.  This allows cursors to work in a somewhat sane fashion with
nested transactions.  For now, cursor behavior is non-subtransactional,
that is a cursor's state does not roll back if you abort a subtransaction
that fetched from the cursor.  We might want to change that later.
This commit is contained in:
Tom Lane
2004-07-17 03:32:14 +00:00
parent f4c069ca8f
commit fe548629c5
41 changed files with 2086 additions and 1192 deletions
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43
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 1.52 2004/07/01 00:49:27 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gistscan.c,v 1.53 2004/07/17 03:27:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -17,6 +17,7 @@
#include "access/genam.h"
#include "access/gist.h"
#include "access/gistscan.h"
#include "utils/resowner.h"
/* routines defined and used here */
@ -41,7 +42,7 @@ static void adjustiptr(IndexScanDesc s, ItemPointer iptr,
typedef struct GISTScanListData
{
IndexScanDesc gsl_scan;
TransactionId gsl_creatingXid;
ResourceOwner gsl_owner;
struct GISTScanListData *gsl_next;
} GISTScanListData;
@ -224,7 +225,7 @@ gistregscan(IndexScanDesc s)
l = (GISTScanList) palloc(sizeof(GISTScanListData));
l->gsl_scan = s;
l->gsl_creatingXid = GetCurrentTransactionId();
l->gsl_owner = CurrentResourceOwner;
l->gsl_next = GISTScans;
GISTScans = l;
}
@ -253,52 +254,28 @@ gistdropscan(IndexScanDesc s)
}
/*
* AtEOXact_gist() --- clean up gist subsystem at xact abort or commit.
* ReleaseResources_gist() --- clean up gist subsystem resources.
*
* This is here because it needs to touch this module's static var GISTScans.
*/
void
AtEOXact_gist(void)
{
/*
* Note: these actions should only be necessary during xact abort; but
* they can't hurt during a commit.
*/
/*
* Reset the active-scans list to empty. We do not need to free the
* list elements, because they're all palloc()'d, so they'll go away
* at end of transaction anyway.
*/
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)
ReleaseResources_gist(void)
{
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.
* Note: this should be a no-op during normal query shutdown.
* However, in an abort situation ExecutorEnd is not called and so
* there may be open index scans to clean up.
*/
prev = NULL;
for (l = GISTScans; l != NULL; l = next)
{
next = l->gsl_next;
if (l->gsl_creatingXid == childXid)
if (l->gsl_owner == CurrentResourceOwner)
{
if (prev == NULL)
GISTScans = next;