1 /* 2 * Copyright (c) 2022 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 16 #ifndef CONDITION_LOCK_H 17 #define CONDITION_LOCK_H 18 19 #include <mutex> 20 #include <condition_variable> 21 22 namespace OHOS::ObjectStore { 23 template <typename T> 24 class ConditionLock { 25 public: ConditionLock()26 explicit ConditionLock() {} ~ConditionLock()27 ~ConditionLock() {} 28 public: Notify(const T & data)29 void Notify(const T &data) 30 { 31 std::lock_guard<std::mutex> lock(mutex_); 32 data_ = data; 33 isSet_ = true; 34 cv_.notify_one(); 35 } 36 Wait()37 T Wait() 38 { 39 std::unique_lock<std::mutex> lock(mutex_); 40 cv_.wait_for(lock, std::chrono::seconds(INTERVAL), [this]() { return isSet_; }); 41 T data = data_; 42 cv_.notify_one(); 43 return data; 44 } 45 Clear()46 void Clear() 47 { 48 std::lock_guard<std::mutex> lock(mutex_); 49 isSet_ = false; 50 cv_.notify_one(); 51 } 52 53 private: 54 bool isSet_ = false; 55 T data_; 56 std::mutex mutex_; 57 std::condition_variable cv_; 58 static constexpr int64_t INTERVAL = 5; 59 }; 60 } // namespace OHOS::ObjectStore 61 62 #endif // CONDITION_LOCK_H 63