count_down_latch.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef FLUTTER_FML_SYNCHRONIZATION_COUNT_DOWN_LATCH_H_
#define FLUTTER_FML_SYNCHRONIZATION_COUNT_DOWN_LATCH_H_
 
#include <atomic>
 
#include "flutter/fml/macros.h"
#include "flutter/fml/synchronization/waitable_event.h"
 
namespace fml {
 
class CountDownLatch {
 public:
  explicit CountDownLatch(size_t count);
 
  ~CountDownLatch();
 
  void Wait();
 
  void CountDown();
 
 private:
  std::atomic_size_t count_;
  ManualResetWaitableEvent waitable_event_;
 
  FML_DISALLOW_COPY_AND_ASSIGN(CountDownLatch);
};
 
}  // namespace fml
 
#endif  // FLUTTER_FML_SYNCHRONIZATION_COUNT_DOWN_LATCH_H_