Added parallel marking threads.

src/mark-compact.h

Index: src/mark-compact.h
diff --git a/src/mark-compact.h b/src/mark-compact.h
index 0c98016fd2b2246470752fa30d857e3525aac7eb..c9e5a888f077a23fa2557e195cd023abbe807373 100644
--- a/src/mark-compact.h
+++ b/src/mark-compact.h
@@ -690,6 +690,10 @@ class MarkCompactCollector {
 
   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();