--- old/src/share/vm/gc/shared/concurrentGCThread.hpp	2016-02-24 13:41:11.537417945 -0500
+++ new/src/share/vm/gc/shared/concurrentGCThread.hpp	2016-02-24 13:41:11.376419958 -0500
@@ -48,12 +48,27 @@
   // Record that the current thread is terminating, and will do more
   // concurrent work.
   void terminate();
+  
+  // Most implementations of ConcurrentGCThread use ConcurrentGCThread's termination protocol,
+  // run(), and stop() methods, and provide specific implementations of run_service() and stop_service.
+  // Otherwise run_service() and stop_service should not be called.)
+  
+  // Do the specific GC work. Called by run() after initialization complete.
+  virtual void run_service() { ShouldNotReachHere(); }
+  
+  // Shut down the specific GC work. Called by stop() as part of termination protocol.
+  virtual void stop_service() { ShouldNotReachHere(); }
 
 public:
   ConcurrentGCThread();
 
   // Tester
   bool is_ConcurrentGC_thread() const { return true; }
+  
+  virtual void run();
+  
+  // shutdown following termination protocol
+  virtual void stop();
 };
 
 // The SurrogateLockerThread is used by concurrent GC threads for