diff -r d30fa85f9994 -r eff609af17d7 src/share/vm/runtime/mutexLocker.hpp
--- a/src/share/vm/runtime/mutexLocker.hpp	Thu Jan 12 00:06:47 2012 -0800
+++ b/src/share/vm/runtime/mutexLocker.hpp	Wed Jan 25 12:58:23 2012 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -115,7 +115,7 @@
 
 #ifndef PRODUCT
 extern Mutex*   FullGCALot_lock;                 // a lock to make FullGCALot MT safe
-#endif
+#endif // PRODUCT
 extern Mutex*   Debug1_lock;                     // A bunch of pre-allocated locks that can be used for tracing
 extern Mutex*   Debug2_lock;                     // down synchronization related bugs!
 extern Mutex*   Debug3_lock;
@@ -129,6 +129,7 @@
 extern Mutex*   FreeList_lock;                   // protects the free region list during safepoints
 extern Monitor* SecondaryFreeList_lock;          // protects the secondary free region list
 extern Mutex*   OldSets_lock;                    // protects the old region sets
+extern Monitor* RootRegionScan_lock;             // used to notify that the CM threads have finished scanning the IM snapshot regions
 extern Mutex*   MMUTracker_lock;                 // protects the MMU
                                                  // tracker data structures
 extern Mutex*   HotCardCache_lock;               // protects the hot card cache