kaldi-semaphore.h
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// util/kaldi-semaphore.h
// Copyright 2012 Karel Vesely (Brno University of Technology)
// 2017 Dogan Can (University of Southern California)
// See ../../COPYING for clarification regarding multiple authors
//
// 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
//
// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
// MERCHANTABLITY OR NON-INFRINGEMENT.
// See the Apache 2 License for the specific language governing permissions and
// limitations under the License.
#ifndef KALDI_THREAD_KALDI_SEMAPHORE_H_
#define KALDI_THREAD_KALDI_SEMAPHORE_H_ 1
#include <mutex>
#include <condition_variable>
namespace kaldi {
class Semaphore {
public:
Semaphore(int32 count = 0);
~Semaphore();
bool TryWait(); ///< Returns true if Wait() goes through
void Wait(); ///< decrease the counter
void Signal(); ///< increase the counter
private:
int32 count_; ///< the semaphore counter, 0 means block on Wait()
std::mutex mutex_;
std::condition_variable condition_variable_;
KALDI_DISALLOW_COPY_AND_ASSIGN(Semaphore);
};
} //namespace
#endif // KALDI_THREAD_KALDI_SEMAPHORE_H_