--- old/src/share/vm/gc/g1/heapRegion.hpp	2016-03-08 15:19:56.027393161 -0500
+++ new/src/share/vm/gc/g1/heapRegion.hpp	2016-03-08 15:19:55.311352729 -0500
@@ -761,14 +761,29 @@
   friend class HeapRegionManager;
   friend class G1CollectedHeap;
 
+ public:
+  HeapRegionClosure() {}
+
+  // Typically called on each region until it returns true.
+  virtual void doHeapRegion(HeapRegion* r) = 0;
+};
+
+// AbortableHeapRegionClosure is used for iterating over regions.
+// Terminates the iteration when the "doHeapRegion" method returns "true".
+class AbortableHeapRegionClosure : public StackObj {
+  friend class HeapRegionManager;
+  friend class G1CollectedHeap;
+
   bool _complete;
   void incomplete() { _complete = false; }
 
  public:
-  HeapRegionClosure(): _complete(true) {}
+  AbortableHeapRegionClosure(): _complete(true) {}
+
+  //void doHeapRegion(HeapRegion* r) {}
 
   // Typically called on each region until it returns true.
-  virtual bool doHeapRegion(HeapRegion* r) = 0;
+  virtual bool doHeapRegionAbortable(HeapRegion* r) = 0;
 
   // True after iteration if the closure was applied to all heap regions
   // and returned "false" in all cases.