Parallel and concurrent sweeping.

src/sweeper-thread.h

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-#ifndef V8_PLATFORM_POSIX_H_
-#define V8_PLATFORM_POSIX_H_
+#ifndef V8_SWEEPER_THREAD_H_
+#define V8_SWEEPER_THREAD_H_
+
+#include "atomicops.h"
+#include "flags.h"
+#include "platform.h"
+#include "v8utils.h"
+
+#include "spaces.h"
+
+#include "heap.h"
 
 namespace v8 {
 namespace internal {
 
-// Used by platform implementation files during OS::PostSetUp().
-void POSIXPostSetUp();
+class SweeperThread : public Thread {
+ public:
+  explicit SweeperThread(Isolate* isolate);
+
+  void Run();
+  void Stop();
+  void StartSweeping();
+  void WaitForSweeperThread();
+  intptr_t StealMemory(PagedSpace* space);
+
+  static bool sweeping_pending() { return sweeping_pending_; }
+  static void set_sweeping_pending(bool sweeping_pending) {
+    sweeping_pending_ = sweeping_pending;
+  }
+
+  ~SweeperThread() {
+    delete start_sweeping_semaphore_;
+    delete end_sweeping_semaphore_;
+    delete stop_semaphore_;
+  }
+
+ private:
+  Isolate* isolate_;
+  Heap* heap_;
+  MarkCompactCollector* collector_;
+  Semaphore* start_sweeping_semaphore_;
+  Semaphore* end_sweeping_semaphore_;
+  Semaphore* stop_semaphore_;
+  FreeList free_list_old_data_space_;
+  FreeList free_list_old_pointer_space_;
+  FreeList private_free_list_old_data_space_;
+  FreeList private_free_list_old_pointer_space_;
+  volatile AtomicWord stop_thread_;
+  static bool sweeping_pending_;
+};
 
 } }  // namespace v8::internal
 
-#endif  // V8_PLATFORM_POSIX_H_
+#endif  // V8_SWEEPER_THREAD_H_