--- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.hpp	Tue Nov 22 04:47:10 2011 -0500
+++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.hpp	Tue Aug 09 10:16:01 2011 -0700
@@ -35,6 +35,7 @@
 class GCTaskManager;
 
 class GCTaskThread : public WorkerThread {
+  friend class GCTaskManager;
 private:
   // Instance state.
   GCTaskManager* _manager;              // Manager for worker.
@@ -45,6 +46,8 @@
 
   GCTaskTimeStamp* time_stamp_at(uint index);
 
+  bool _is_working;                     // True if participating in GC tasks
+
  public:
   // Factory create and destroy methods.
   static GCTaskThread* create(GCTaskManager* manager,
@@ -84,6 +87,7 @@
   uint processor_id() const {
     return _processor_id;
   }
+  void set_is_working(bool v) { _is_working = v; }
 };
 
 class GCTaskTimeStamp : public CHeapObj