1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 #ifndef OHOS_PROFILER_STD_SEMAPHORE_H 16 #define OHOS_PROFILER_STD_SEMAPHORE_H 17 18 #include <condition_variable> 19 #include <mutex> 20 #include "i_semaphore.h" 21 #include "nocopyable.h" 22 23 class StdSemaphore : public ISemaphore { 24 public: 25 explicit StdSemaphore(unsigned int value); 26 ~StdSemaphore(); 27 bool Wait() override; 28 bool TryWait() override; 29 bool TimedWait(int seconds, int nanoSeconds) override; 30 bool Post() override; 31 unsigned int Value() const override; 32 33 private: 34 bool TryWaitLocked(); 35 36 mutable std::mutex mutex_; 37 std::condition_variable condVar_; 38 volatile unsigned int value_; 39 40 DISALLOW_COPY_AND_MOVE(StdSemaphore); 41 }; 42 43 class StdSemaphoreFactory : public ISemaphoreFactory { 44 public: 45 SemaphorePtr Create(unsigned int value) override; 46 }; 47 48 #endif // OHOS_PROFILER_STD_SEMAPHORE_H