--- old/src/share/vm/runtime/os.hpp	2011-02-25 10:00:10.895859900 +0100
+++ new/src/share/vm/runtime/os.hpp	2011-02-25 10:00:10.534839300 +0100
@@ -492,6 +492,9 @@
   static void print_location(outputStream* st, intptr_t x, bool verbose = false);
   static size_t lasterror(char *buf, size_t len);
 
+  // Determines whether the calling process is being debugged by a user-mode debugger.
+  static bool is_debugger_attached();
+
   // The following two functions are used by fatal error handler to trace
   // native (C) frames. They are not part of frame.hpp/frame.cpp because
   // frame.hpp/cpp assume thread is JavaThread, and also because different