Run Crankshaft on a separate thread.

src/optimizing-compiler-thread.h

 // Copyright 2012 the V8 project authors. All rights reserved.
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-// Flags: --count-based-interrupts --interrupt-budget=10 --weighted-back-edges --allow-natives-syntax
+#ifndef V8_OPTIMIZING_COMPILER_THREAD_H_
+#define V8_OPTIMIZING_COMPILER_THREAD_H_
 
-// Test that OSR works properly when using count-based interrupting/profiling.
+#include "v8.h"
 
-function osr_this() {
-  var a = 1;
-  // Trigger OSR.
-  while (%GetOptimizationStatus(osr_this) == 2) {}
-  return a;
-}
-assertEquals(1, osr_this());
+#include "atomicops.h"
+#include "objects.h"
+#include "platform.h"
+#include "unbound-queue.h"
+
+namespace v8 {
+namespace internal {
+
+class OptimizingCompilerThread : public Thread {
+ public:
+  explicit OptimizingCompilerThread(Isolate *i) :
+      Thread("OptimizingCompilerThread"), isolate_(i) {
+    queue_semaphore_ = OS::CreateSemaphore(0);
+    queue_mutex_ = OS::CreateMutex();
+    NoBarrier_Store(&stop_thread_, static_cast<AtomicWord>(false));
+  }
+
+  void Run();
+  void StopThread();
+  void QueueForOptimization(Handle<JSFunction> function);
+
+  ~OptimizingCompilerThread() {
+    delete queue_semaphore_;
+    delete queue_mutex_;
+  }
+
+ private:
+  Isolate* isolate_;
+  Mutex* queue_mutex_;
+  UnboundQueue<Handle<JSFunction> > queue_;
+  Semaphore* queue_semaphore_;
+  volatile AtomicWord stop_thread_;
+};
+
+} }  // namespace v8::internal
+
+#endif  // V8_OPTIMIZING_COMPILER_THREAD_H_