--- a/hotspot/src/os/linux/vm/osThread_linux.hpp	Sun Apr 15 15:37:20 2012 -0700
+++ b/hotspot/src/os/linux/vm/osThread_linux.hpp	Tue Mar 06 12:36:59 2012 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 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
@@ -56,6 +56,8 @@
   sigset_t  caller_sigmask() const       { return _caller_sigmask; }
   void    set_caller_sigmask(sigset_t sigmask)  { _caller_sigmask = sigmask; }
 
+  static size_t thread_id_size()         { return sizeof(pid_t); }
+
   pid_t thread_id() const {
     return _thread_id;
   }