From fa72121594534dda6cc010f0bf6b3e8d22987526 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Wed, 12 Oct 2005 16:55:59 +0000
Subject: [PATCH] Fix another recently-changed place that was messing with
 spinlock- protected data structures and not using a volatile pointer for
 same.

---
 src/backend/storage/lmgr/lwlock.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/backend/storage/lmgr/lwlock.c b/src/backend/storage/lmgr/lwlock.c
index 8b7565a6aa..ce0606a3c4 100644
--- a/src/backend/storage/lmgr/lwlock.c
+++ b/src/backend/storage/lmgr/lwlock.c
@@ -15,7 +15,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/storage/lmgr/lwlock.c,v 1.32 2005/10/07 21:42:38 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/storage/lmgr/lwlock.c,v 1.33 2005/10/12 16:55:59 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -226,7 +226,8 @@ LWLockId
 LWLockAssign(void)
 {
 	LWLockId	result;
-	int		   *LWLockCounter;
+	/* use volatile pointer to prevent code rearrangement */
+	volatile int *LWLockCounter;
 
 	LWLockCounter = (int *) ((char *) LWLockArray - 2 * sizeof(int));
 	SpinLockAcquire(ShmemLock);