--- Libc/Libc-320/pthreads/pthread_impl.h
+++ Libc/Libc-498/pthreads/pthread_impl.h
@@ -2,8 +2,6 @@
  * Copyright (c) 2000-2003 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
- * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
  * 
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
@@ -39,6 +37,7 @@
 #define _PTHREAD_MUTEX_SIG_init		0x32AAABA7
 #define _PTHREAD_COND_SIG_init		0x3CB0B1BB
 #define _PTHREAD_ONCE_SIG_init		0x30B1BCBA
+#define _PTHREAD_RWLOCK_SIG_init    0x2DA8B3B4
 /*
  * POSIX scheduling policies
  */