Wait for sweeper threads in incremental marking step when sweeper threads are done sweeping.

src/sweeper-thread.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sweeper-thread.h"
 
 #include "v8.h"
 
 #include "isolate.h"
 #include "v8threads.h"
@@ skipping 48 matching lines @@
 void SweeperThread::StartSweeping() {
   start_sweeping_semaphore_.Signal();
 }
 
 
 void SweeperThread::WaitForSweeperThread() {
   end_sweeping_semaphore_.Wait();
 }
 
 
+bool SweeperThread::SweepingCompleted() {
+  bool value = end_sweeping_semaphore_.WaitFor(TimeDelta::FromSeconds(0));
+  if (value) {
+    end_sweeping_semaphore_.Signal();
+  }
+  return value;
+}
+
+
 int SweeperThread::NumberOfThreads(int max_available) {
   if (!FLAG_concurrent_sweeping && !FLAG_parallel_sweeping) return 0;
   if (FLAG_sweeper_threads > 0) return FLAG_sweeper_threads;
   if (FLAG_concurrent_sweeping) return max_available - 1;
   ASSERT(FLAG_parallel_sweeping);
   return max_available;
 }
 
 } }  // namespace v8::internal