Introduce helper functions to test parallel recompilation.

src/optimizing-compiler-thread.h

 // Copyright 2012 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
@@ skipping 11 matching lines @@
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef V8_OPTIMIZING_COMPILER_THREAD_H_
 #define V8_OPTIMIZING_COMPILER_THREAD_H_
 
 #include "atomicops.h"
+#include "flags.h"
 #include "platform.h"
-#include "flags.h"
 #include "unbound-queue.h"
 
 namespace v8 {
 namespace internal {
 
 class HGraphBuilder;
 class OptimizingCompiler;
+class SharedFunctionInfo;
 
 class OptimizingCompilerThread : public Thread {
  public:
   explicit OptimizingCompilerThread(Isolate *isolate) :
       Thread("OptimizingCompilerThread"),
       isolate_(isolate),
       stop_semaphore_(OS::CreateSemaphore(0)),
       input_queue_semaphore_(OS::CreateSemaphore(0)),
+      output_queue_semaphore_(OS::CreateSemaphore(0)),
       time_spent_compiling_(0),
       time_spent_total_(0) {
     NoBarrier_Store(&stop_thread_, static_cast<AtomicWord>(false));
     NoBarrier_Store(&queue_length_, static_cast<AtomicWord>(0));
   }
 
   void Run();
   void Stop();
   void QueueForOptimization(OptimizingCompiler* optimizing_compiler);
   void InstallOptimizedFunctions();
 
+  // Wait for the next optimized function and install it.
+  Handle<SharedFunctionInfo> InstallNextOptimizedFunction();
+
   inline bool IsQueueAvailable() {
     // We don't need a barrier since we have a data dependency right
     // after.
     Atomic32 current_length = NoBarrier_Load(&queue_length_);
 
     // This can be queried only from the execution thread.
     ASSERT(!IsOptimizerThread());
     // Since only the execution thread increments queue_length_ and
     // only one thread can run inside an Isolate at one time, a direct
     // doesn't introduce a race -- queue_length_ may decreased in
     // meantime, but not increased.
     return (current_length < FLAG_parallel_recompilation_queue_length);
   }
 
 #ifdef DEBUG
   bool IsOptimizerThread();
 #endif
 
   ~OptimizingCompilerThread() {
     delete input_queue_semaphore_;
+    delete output_queue_semaphore_;  // Only used for manual mode.
     delete stop_semaphore_;
   }
 
  private:
   Isolate* isolate_;
   Semaphore* stop_semaphore_;
   Semaphore* input_queue_semaphore_;
+  Semaphore* output_queue_semaphore_;
   UnboundQueue<OptimizingCompiler*> input_queue_;
   UnboundQueue<OptimizingCompiler*> output_queue_;
   volatile AtomicWord stop_thread_;
   volatile Atomic32 queue_length_;
   int64_t time_spent_compiling_;
   int64_t time_spent_total_;
 
 #ifdef DEBUG
   int thread_id_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OPTIMIZING_COMPILER_THREAD_H_