src/hotspot/share/gc/shared/taskqueue.hpp

rev 52710 : Upstream/backport Shenandoah to JDK11u

@@ -356,10 +356,11 @@
 protected:
   static int randomParkAndMiller(int* seed0);
 public:
   // Returns "true" if some TaskQueue in the set contains a task.
   virtual bool peek() = 0;
+  virtual size_t tasks() = 0;
 };
 
 template <MEMFLAGS F> class TaskQueueSetSuperImpl: public CHeapObj<F>, public TaskQueueSetSuper {
 };
 

@@ -387,10 +388,11 @@
   // succeeds, returns "true" and sets "t" to the stolen task, otherwise returns
   // false.
   bool steal(uint queue_num, int* seed, E& t);
 
   bool peek();
+  size_t tasks();
 
   uint size() const { return _n; }
 };
 
 template<class T, MEMFLAGS F> void

@@ -412,10 +414,20 @@
       return true;
   }
   return false;
 }
 
+template<class T, MEMFLAGS F>
+size_t GenericTaskQueueSet<T, F>::tasks() {
+  size_t n = 0;
+  for (uint j = 0; j < _n; j++) {
+    n += _queues[j]->size();
+  }
+  return n;
+}
+
+
 // When to terminate from the termination protocol.
 class TerminatorTerminator: public CHeapObj<mtInternal> {
 public:
   virtual bool should_exit_termination() = 0;
 };

@@ -424,11 +436,11 @@
 // TaskQueueSet's for work stealing.
 
 #undef TRACESPINNING
 
 class ParallelTaskTerminator: public StackObj {
-private:
+protected:
   uint _n_threads;
   TaskQueueSetSuper* _queue_set;
 
   DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, 0);
   volatile uint _offered_termination;

@@ -460,11 +472,11 @@
   }
 
   // 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.
-  bool offer_termination(TerminatorTerminator* terminator);
+  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.