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Two-phase commit. Original patch by Heikki Linnakangas, with additional

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hacking by Alvaro Herrera and Tom Lane.
This commit is contained in:
Tom Lane
2005-06-17 22:32:51 +00:00
parent 5495575903
commit d0a89683a3
61 changed files with 4454 additions and 439 deletions
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44
src/backend/utils/mmgr/portalmem.c
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@@ -12,7 +12,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/mmgr/portalmem.c,v 1.80 2005/05/29 04:23:06 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/mmgr/portalmem.c,v 1.81 2005/06/17 22:32:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -466,6 +466,48 @@ CommitHoldablePortals(void)
return result;
}
/*
* Pre-prepare processing for portals.
*
* Currently we refuse PREPARE if the transaction created any holdable
* cursors, since it's quite unclear what to do with one. However, this
* has the same API as CommitHoldablePortals and is invoked in the same
* way by xact.c, so that we can easily do something reasonable if anyone
* comes up with something reasonable to do.
*
* Returns TRUE if any holdable cursors were processed, FALSE if not.
*/
bool
PrepareHoldablePortals(void)
{
bool result = false;
HASH_SEQ_STATUS status;
PortalHashEnt *hentry;
hash_seq_init(&status, PortalHashTable);
while ((hentry = (PortalHashEnt *) hash_seq_search(&status)) != NULL)
{
Portal portal = hentry->portal;
/* Is it a holdable portal created in the current xact? */
if ((portal->cursorOptions & CURSOR_OPT_HOLD) &&
portal->createSubid != InvalidSubTransactionId &&
portal->status == PORTAL_READY)
{
/*
* We are exiting the transaction that created a holdable
* cursor. Can't do PREPARE.
*/
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot PREPARE a transaction that has created a cursor WITH HOLD")));
}
}
return result;
}
/*
* Pre-commit processing for portals.
*