*** pgsql/src/backend/access/transam/xlog.c	2010/02/26 02:00:35	1.379
--- pgsql/src/backend/access/transam/xlog.c	2010/03/10 02:04:48	1.380
***************
*** 7,13 ****
   * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
   * Portions Copyright (c) 1994, Regents of the University of California
   *
!  * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.378 2010/02/25 02:17:50 tgl Exp $
   *
   *-------------------------------------------------------------------------
   */
--- 7,13 ----
   * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
   * Portions Copyright (c) 1994, Regents of the University of California
   *
!  * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.379 2010/02/26 02:00:35 momjian Exp $
   *
   *-------------------------------------------------------------------------
   */
*************** pg_start_backup(PG_FUNCTION_ARGS)
*** 7897,7903 ****
  		 * REDO pointer.  The oldest point in WAL that would be needed to
  		 * restore starting from the checkpoint is precisely the REDO pointer.
  		 */
! 		LWLockAcquire(ControlFileLock, LW_EXCLUSIVE);
  		checkpointloc = ControlFile->checkPoint;
  		startpoint = ControlFile->checkPointCopy.redo;
  		LWLockRelease(ControlFileLock);
--- 7897,7903 ----
  		 * REDO pointer.  The oldest point in WAL that would be needed to
  		 * restore starting from the checkpoint is precisely the REDO pointer.
  		 */
! 		LWLockAcquire(ControlFileLock, LW_SHARED);
  		checkpointloc = ControlFile->checkPoint;
  		startpoint = ControlFile->checkPointCopy.redo;
  		LWLockRelease(ControlFileLock);