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51 lines
1.4 KiB
51 lines
1.4 KiB
// util/kaldi-semaphore.h
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// Copyright 2012 Karel Vesely (Brno University of Technology)
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// 2017 Dogan Can (University of Southern California)
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// See ../../COPYING for clarification regarding multiple authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
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// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
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// MERCHANTABLITY OR NON-INFRINGEMENT.
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// See the Apache 2 License for the specific language governing permissions and
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// limitations under the License.
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#ifndef KALDI_THREAD_KALDI_SEMAPHORE_H_
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#define KALDI_THREAD_KALDI_SEMAPHORE_H_ 1
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#include <mutex>
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#include <condition_variable>
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namespace kaldi {
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class Semaphore {
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public:
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Semaphore(int32 count = 0);
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~Semaphore();
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bool TryWait(); ///< Returns true if Wait() goes through
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void Wait(); ///< decrease the counter
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void Signal(); ///< increase the counter
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private:
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int32 count_; ///< the semaphore counter, 0 means block on Wait()
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std::mutex mutex_;
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std::condition_variable condition_variable_;
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KALDI_DISALLOW_COPY_AND_ASSIGN(Semaphore);
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};
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} //namespace
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#endif // KALDI_THREAD_KALDI_SEMAPHORE_H_
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