Added parallel marking threads.

src/marking-thread.h

-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2013 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
 //       with the distribution.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#ifndef V8_VM_STATE_H_
-#define V8_VM_STATE_H_
+#ifndef V8_MARKING_THREAD_H_
+#define V8_MARKING_THREAD_H_
 
-#include "allocation.h"
-#include "isolate.h"
+#include "atomicops.h"
+#include "flags.h"
+#include "platform.h"
+#include "v8utils.h"
+
+#include "spaces.h"
+
+#include "heap.h"
 
 namespace v8 {
 namespace internal {
 
-class VMState BASE_EMBEDDED {
+class MarkingThread : public Thread {
  public:
-  inline VMState(Isolate* isolate, StateTag tag);
-  inline ~VMState();
+  explicit MarkingThread(Isolate* isolate);
+
+  void Run();
+  void Stop();
+  void StartMarking();
+  void WaitForMarkingThread();
+
+  ~MarkingThread() {
+    delete start_marking_semaphore_;

[tfarina, 2013/01/31 21:20:30]

isn't there a scoped_ptr type to handle this?

+    delete end_marking_semaphore_;
+    delete stop_semaphore_;
+  }
 
  private:
   Isolate* isolate_;
-  StateTag previous_tag_;
-};
-
-
-class ExternalCallbackScope BASE_EMBEDDED {
- public:
-  inline ExternalCallbackScope(Isolate* isolate, Address callback);
-  inline ~ExternalCallbackScope();
- private:
-  Isolate* isolate_;
-  Address previous_callback_;
+  Heap* heap_;
+  Semaphore* start_marking_semaphore_;
+  Semaphore* end_marking_semaphore_;
+  Semaphore* stop_semaphore_;
+  volatile AtomicWord stop_thread_;
+  int id_;
+  static Atomic32 id_counter_;
 };
 
 } }  // namespace v8::internal
 
-
-#endif  // V8_VM_STATE_H_
+#endif  // V8_MARKING_THREAD_H_