From 4bf2dfb9a26a9d6f97b8d54e939d2bf02c4d99a1 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Wed, 5 Sep 2007 20:53:17 +0000
Subject: [PATCH] Quick hack to make the VXID of a prepared transaction be
 -1/XID, so that different prepared xacts can be told apart in the pg_locks
 view.  Per suggestion from Florian.

---
 src/backend/access/transam/twophase.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/backend/access/transam/twophase.c b/src/backend/access/transam/twophase.c
index 3e7e843502..db47e95cf8 100644
--- a/src/backend/access/transam/twophase.c
+++ b/src/backend/access/transam/twophase.c
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *		$PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.33 2007/09/05 18:10:47 tgl Exp $
+ *		$PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.34 2007/09/05 20:53:17 tgl Exp $
  *
  * NOTES
  *		Each global transaction is associated with a global transaction
@@ -274,7 +274,8 @@ MarkAsPreparing(TransactionId xid, const char *gid,
 	MemSet(&gxact->proc, 0, sizeof(PGPROC));
 	SHMQueueElemInit(&(gxact->proc.links));
 	gxact->proc.waitStatus = STATUS_OK;
-	gxact->proc.lxid = InvalidLocalTransactionId;
+	/* We set up the gxact's VXID as InvalidBackendId/XID */
+	gxact->proc.lxid = (LocalTransactionId) xid;
 	gxact->proc.xid = xid;
 	gxact->proc.xmin = InvalidTransactionId;
 	gxact->proc.pid = 0;