Run Crankshaft on a separate thread.

src/optimizing-compiler-thread.h

Index: src/optimizing-compiler-thread.h
diff --git a/test/mjsunit/count-based-osr.js b/src/optimizing-compiler-thread.h
similarity index 61%
copy from test/mjsunit/count-based-osr.js
copy to src/optimizing-compiler-thread.h
index 125c4e26d5c641b947def268f236876eb9f3e6c1..3a1eee785877a34f09bff7fd04475cbaacb9a314 100644
--- a/test/mjsunit/count-based-osr.js
+++ b/src/optimizing-compiler-thread.h
@@ -25,14 +25,45 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// 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_