kaldi-semaphore.cc
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// util/kaldi-semaphore.cc
// 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.
#include "base/kaldi-error.h"
#include "util/kaldi-semaphore.h"
namespace kaldi {
Semaphore::Semaphore(int32 count) {
KALDI_ASSERT(count >= 0);
count_ = count;
}
Semaphore::~Semaphore() {}
bool Semaphore::TryWait() {
std::unique_lock<std::mutex> lock(mutex_);
if(count_) {
count_--;
return true;
}
return false;
}
void Semaphore::Wait() {
std::unique_lock<std::mutex> lock(mutex_);
while(!count_)
condition_variable_.wait(lock);
count_--;
}
void Semaphore::Signal() {
std::unique_lock<std::mutex> lock(mutex_);
count_++;
condition_variable_.notify_one();
}
} // namespace kaldi