Added parallel marking threads.

src/mark-compact.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 672 matching lines @@
   void SweepInParallel(PagedSpace* space,
                        FreeList* private_free_list,
                        FreeList* free_list);
 
   void WaitUntilSweepingCompleted();
 
   intptr_t StealMemoryFromSweeperThreads(PagedSpace* space);
 
   bool AreSweeperThreadsActivated();
 
+  void MarkInParallel();

[Michael Starzinger, 2013/01/31 14:00:04]

This is getting clunky, can we group these functions into a "// Parallel
sweeping support." and a "// Parallel marking support." section?

[Hannes Payer (out of office), 2013/01/31 14:09:10]

Done.

+
+  void WaitUntilMarkingCompleted();
+
  private:
   MarkCompactCollector();
   ~MarkCompactCollector();
 
   bool MarkInvalidatedCode();
   void RemoveDeadInvalidatedCode();
   void ProcessInvalidatedCode(ObjectVisitor* visitor);
 
   void StartSweeperThreads();
 
@@ skipping 181 matching lines @@
 
   friend class Heap;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 
 } }  // namespace v8::internal
 
 #endif  // V8_MARK_COMPACT_H_