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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/rtree/rtscan.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/rtree/rtscan.c,v 1.51 2004/01/07 18:56:24 neilc Exp $
* $PostgreSQL: pgsql/src/backend/access/rtree/rtscan.c,v 1.52 2004/07/01 00:49:31 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -42,6 +42,7 @@ static void adjustiptr(IndexScanDesc s, ItemPointer iptr,
typedef struct RTScanListData
{
IndexScanDesc rtsl_scan;
TransactionId rtsl_creatingXid;
struct RTScanListData *rtsl_next;
} RTScanListData;
@@ -240,6 +241,7 @@ rtregscan(IndexScanDesc s)
l = (RTScanList) palloc(sizeof(RTScanListData));
l->rtsl_scan = s;
l->rtsl_creatingXid = GetCurrentTransactionId();
l->rtsl_next = RTScans;
RTScans = l;
}
@@ -290,6 +292,46 @@ AtEOXact_rtree(void)
RTScans = NULL;
}
/*
* AtEOSubXact_rtree() --- clean up rtree subsystem at subxact abort or commit.
*
* This is here because it needs to touch this module's static var RTScans.
*/
void
AtEOSubXact_rtree(TransactionId childXid)
{
RTScanList l;
RTScanList prev;
RTScanList 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 = RTScans; l != NULL; l = next)
{
next = l->rtsl_next;
if (l->rtsl_creatingXid == childXid)
{
if (prev == NULL)
RTScans = next;
else
prev->rtsl_next = next;
pfree(l);
/* prev does not change */
}
else
prev = l;
}
}
void
rtadjscans(Relation r, int op, BlockNumber blkno, OffsetNumber offnum)
{