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

@@ -27,10 +27,11 @@
 
 #include "gc/shared/gcCause.hpp"
 #include "gc/shared/gcWhen.hpp"
 #include "gc/shared/verifyOption.hpp"
 #include "memory/allocation.hpp"
+#include "memory/heapInspection.hpp"
 #include "memory/universe.hpp"
 #include "runtime/handles.hpp"
 #include "runtime/perfData.hpp"
 #include "runtime/safepoint.hpp"
 #include "services/memoryUsage.hpp"

@@ -42,10 +43,11 @@
 // A "CollectedHeap" is an implementation of a java heap for HotSpot.  This
 // is an abstract class: there may be many different kinds of heaps.  This
 // class defines the functions that a heap must implement, and contains
 // infrastructure common to all heaps.
 
+class AbstractGangTask;
 class AdaptiveSizePolicy;
 class BarrierSet;
 class GCHeapSummary;
 class GCTimer;
 class GCTracer;

@@ -83,10 +85,15 @@
   void log_heap_after(CollectedHeap* heap) {
     log_heap(heap, false);
   }
 };
 
+class ParallelObjectIterator : public CHeapObj<mtGC> {
+public:
+  virtual void object_iterate(ObjectClosure* cl, uint worker_id) = 0;
+};
+
 //
 // CollectedHeap
 //   GenCollectedHeap
 //     SerialHeap
 //   G1CollectedHeap

@@ -399,10 +406,14 @@
   virtual GrowableArray<MemoryPool*> memory_pools() = 0;
 
   // Iterate over all objects, calling "cl.do_object" on each.
   virtual void object_iterate(ObjectClosure* cl) = 0;
 
+  virtual ParallelObjectIterator* parallel_object_iterator(uint thread_num) {
+    return NULL;
+  }
+
   // Keep alive an object that was loaded with AS_NO_KEEPALIVE.
   virtual void keep_alive(oop obj) {}
 
   // Returns the longest time (in ms) that has elapsed since the last
   // time that any part of the heap was examined by a garbage collection.

@@ -445,10 +456,13 @@
   virtual bool print_location(outputStream* st, void* addr) const = 0;
 
   // Iterator for all GC threads (other than VM thread)
   virtual void gc_threads_do(ThreadClosure* tc) const = 0;
 
+  // Run given task. Possibly in parallel if the GC supports it.
+  virtual void run_task(AbstractGangTask* task) = 0;
+
   // Print any relevant tracing info that flags imply.
   // Default implementation does nothing.
   virtual void print_tracing_info() const = 0;
 
   void print_heap_before_gc();