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 16 #ifndef FOUNDATION_ACE_FRAMEWORKS_BASE_THREAD_BACKGROUND_TASK_EXECUTOR_H 17 #define FOUNDATION_ACE_FRAMEWORKS_BASE_THREAD_BACKGROUND_TASK_EXECUTOR_H 18 19 #include <list> 20 #include <thread> 21 22 #include "base/utils/noncopyable.h" 23 24 namespace OHOS::Ace { 25 26 enum class BgTaskPriority { 27 DEFAULT, 28 LOW, 29 }; 30 31 class BackgroundTaskExecutor { 32 ACE_DISALLOW_COPY_AND_MOVE(BackgroundTaskExecutor); 33 34 public: 35 using Task = std::function<void()>; 36 37 static BackgroundTaskExecutor& GetInstance(); 38 39 bool PostTask(Task&& task, BgTaskPriority priority = BgTaskPriority::DEFAULT); 40 bool PostTask(const Task& task, BgTaskPriority priority = BgTaskPriority::DEFAULT); 41 42 void TriggerGarbageCollection(); 43 44 private: 45 BackgroundTaskExecutor(); 46 ~BackgroundTaskExecutor(); 47 48 void StartNewThreads(size_t num = 1); 49 void ThreadLoop(uint32_t threadNo); 50 51 std::mutex mutex_; 52 std::condition_variable condition_; 53 std::list<Task> tasks_; 54 std::list<Task> lowPriorityTasks_; 55 std::list<std::thread> threads_; 56 size_t currentThreadNum_ { 0 }; 57 size_t maxThreadNum_ { 0 }; 58 bool running_ { true }; 59 uint32_t purgeFlags_ { 0 }; 60 }; 61 62 } // namespace OHOS::Ace 63 64 #endif // FOUNDATION_ACE_FRAMEWORKS_BASE_THREAD_BACKGROUND_TASK_EXECUTOR_H 65