Added a wait with timeout to the platform semaphore class

src/platform-macos.cc

 // Copyright 2006-2008 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 547 matching lines @@
 
   ~MacOSSemaphore() {
     semaphore_destroy(mach_task_self(), semaphore_);
   }
 
   // The MacOS mach semaphore documentation claims it does not have spurious
   // wakeups, the way pthreads semaphores do.  So the code from the linux
   // platform is not needed here.
   void Wait() { semaphore_wait(semaphore_); }
 
+  bool Wait(int timeout);
+
   void Signal() { semaphore_signal(semaphore_); }
 
  private:
   semaphore_t semaphore_;
 };
 
 
+bool MacOSSemaphore::Wait(int timeout) {
+  mach_timespec_t ts;
+  ts.tv_sec = timeout / 1000000;
+  ts.tv_nsec = (timeout % 1000000) * 1000;
+  return semaphore_timedwait(semaphore_, ts) != KERN_OPERATION_TIMED_OUT;
+}
+
+
 Semaphore* OS::CreateSemaphore(int count) {
   return new MacOSSemaphore(count);
 }
 
 
 // ----------------------------------------------------------------------------
 // MacOS socket support.
 //
 
 class MacOSSocket : public Socket {
@@ skipping 242 matching lines @@
   }
 
   // This sampler is no longer the active sampler.
   active_sampler_ = NULL;
   active_ = false;
 }
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal