--- old/src/hotspot/share/gc/shared/taskqueue.hpp	2020-01-30 17:11:14.242625951 +0100
+++ new/src/hotspot/share/gc/shared/taskqueue.hpp	2020-01-30 17:11:13.450614613 +0100
@@ -443,89 +443,6 @@
   virtual bool should_exit_termination() = 0;
 };
 
-// A class to aid in the termination of a set of parallel tasks using
-// TaskQueueSet's for work stealing.
-
-#undef TRACESPINNING
-
-class ParallelTaskTerminator: public CHeapObj<mtGC> {
-protected:
-  uint _n_threads;
-  TaskQueueSetSuper* _queue_set;
-
-  DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, 0);
-  volatile uint _offered_termination;
-  DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile uint));
-
-#ifdef TRACESPINNING
-  static uint _total_yields;
-  static uint _total_spins;
-  static uint _total_peeks;
-#endif
-
-  bool peek_in_queue_set();
-protected:
-  virtual void yield();
-  void sleep(uint millis);
-
-  // Called when exiting termination is requested.
-  // When the request is made, terminator may have already terminated
-  // (e.g. all threads are arrived and offered termination). In this case,
-  // it should ignore the request and complete the termination.
-  // Return true if termination is completed. Otherwise, return false.
-  bool complete_or_exit_termination();
-public:
-
-  // "n_threads" is the number of threads to be terminated.  "queue_set" is a
-  // queue sets of work queues of other threads.
-  ParallelTaskTerminator(uint n_threads, TaskQueueSetSuper* queue_set);
-  virtual ~ParallelTaskTerminator();
-
-  // The current thread has no work, and is ready to terminate if everyone
-  // else is.  If returns "true", all threads are terminated.  If returns
-  // "false", available work has been observed in one of the task queues,
-  // so the global task is not complete.
-  bool offer_termination() {
-    return offer_termination(NULL);
-  }
-
-  // As above, but it also terminates if the should_exit_termination()
-  // method of the terminator parameter returns true. If terminator is
-  // NULL, then it is ignored.
-  virtual bool offer_termination(TerminatorTerminator* terminator);
-
-  // Reset the terminator, so that it may be reused again.
-  // The caller is responsible for ensuring that this is done
-  // in an MT-safe manner, once the previous round of use of
-  // the terminator is finished.
-  void reset_for_reuse();
-  // Same as above but the number of parallel threads is set to the
-  // given number.
-  void reset_for_reuse(uint n_threads);
-
-#ifdef TRACESPINNING
-  static uint total_yields() { return _total_yields; }
-  static uint total_spins() { return _total_spins; }
-  static uint total_peeks() { return _total_peeks; }
-  static void print_termination_counts();
-#endif
-};
-
-class TaskTerminator : public StackObj {
-private:
-  ParallelTaskTerminator*  _terminator;
-
-  NONCOPYABLE(TaskTerminator);
-
-public:
-  TaskTerminator(uint n_threads, TaskQueueSetSuper* queue_set);
-  ~TaskTerminator();
-
-  ParallelTaskTerminator* terminator() const {
-    return _terminator;
-  }
-};
-
 typedef GenericTaskQueue<oop, mtGC>             OopTaskQueue;
 typedef GenericTaskQueueSet<OopTaskQueue, mtGC> OopTaskQueueSet;