win: implement Semaphore

util/synchronization/semaphore.h

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #ifndef CRASHPAD_UTIL_SYNCHRONIZATION_SEMAPHORE_H_
 #define CRASHPAD_UTIL_SYNCHRONIZATION_SEMAPHORE_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_MACOSX)
 #include <dispatch/dispatch.h>
+#elif defined(OS_WIN)
+#include <windows.h>
 #else
 #include <semaphore.h>
 #endif
 
 namespace crashpad {
 
 //! \brief An anonymous in-process counting sempahore.
 class Semaphore {
  public:
   //! \brief Initializes the semaphore.
@@ skipping 14 matching lines @@
 
   //! \brief Performs the signal (or “post”) operation on the semaphore.
   //!
   //! Atomically increments the value of the semaphore by 1. If the new value is
   //! 0, a caller blocked in Wait() will be awakened.
   void Signal();
 
  private:
 #if defined(OS_MACOSX)
   dispatch_semaphore_t semaphore_;
+#elif defined(OS_WIN)
+  HANDLE semaphore_;
 #else
   sem_t semaphore_;
 #endif
 };
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_UTIL_SYNCHRONIZATION_SEMAPHORE_H_