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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/hash/hashscan.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/hash/hashscan.c,v 1.33 2004/01/07 18:56:23 neilc Exp $
* $PostgreSQL: pgsql/src/backend/access/hash/hashscan.c,v 1.34 2004/07/01 00:49:29 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -21,6 +21,7 @@
typedef struct HashScanListData
{
IndexScanDesc hashsl_scan;
TransactionId hashsl_creatingXid;
struct HashScanListData *hashsl_next;
} HashScanListData;
@@ -50,6 +51,46 @@ AtEOXact_hash(void)
HashScans = NULL;
}
/*
* AtEOSubXact_hash() --- clean up hash subsystem at subxact abort or commit.
*
* This is here because it needs to touch this module's static var HashScans.
*/
void
AtEOSubXact_hash(TransactionId childXid)
{
HashScanList l;
HashScanList prev;
HashScanList 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 = HashScans; l != NULL; l = next)
{
next = l->hashsl_next;
if (l->hashsl_creatingXid == childXid)
{
if (prev == NULL)
HashScans = next;
else
prev->hashsl_next = next;
pfree(l);
/* prev does not change */
}
else
prev = l;
}
}
/*
* _Hash_regscan() -- register a new scan.
*/
@@ -60,6 +101,7 @@ _hash_regscan(IndexScanDesc scan)
new_el = (HashScanList) palloc(sizeof(HashScanListData));
new_el->hashsl_scan = scan;
new_el->hashsl_creatingXid = GetCurrentTransactionId();
new_el->hashsl_next = HashScans;
HashScans = new_el;
}