src/share/vm/memory/referenceProcessor.hpp

*** 208,218 ****
    }
  };
  
  class ReferenceProcessor : public CHeapObj<mtGC> {
  
!  private:
    size_t total_count(DiscoveredList lists[]);
  
   protected:
    // Compatibility with pre-4965777 JDK's
    static bool _pending_list_uses_discovered_field;
--- 208,218 ----
    }
  };
  
  class ReferenceProcessor : public CHeapObj<mtGC> {
  
!  public:
    size_t total_count(DiscoveredList lists[]);
  
   protected:
    // Compatibility with pre-4965777 JDK's
    static bool _pending_list_uses_discovered_field;
*** 666,675 ****
--- 666,679 ----
  
    // Returns true if a task marks some oops as alive.
    bool marks_oops_alive() const
    { return _marks_oops_alive; }
  
+   bool is_empty() const {
+     return _ref_processor.total_count(_refs_lists) == 0;
+   }
+ 
  protected:
    ReferenceProcessor& _ref_processor;
    DiscoveredList*     _refs_lists;
    const bool          _marks_oops_alive;
  };