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 USCRIPT_THREADPOOL_H
16 #define USCRIPT_THREADPOOL_H
17 #include <atomic>
18 #include <condition_variable>
19 #include <functional>
20 #include <mutex>
21 #include <thread>
22 #include <vector>
23 
24 namespace Uscript {
25 struct Task {
26     std::function<void(int)> processor;
27     int32_t workSize;
28 };
29 struct TaskNode {
30     Task task;
31     bool available;
32     std::vector<std::atomic_bool*> subTaskFlag;
33 };
34 
35 void SetScriptProportion(float proportion);
36 float GetScriptProportion();
37 
38 class ThreadPool {
39 public:
40     static ThreadPool* CreateThreadPool(int32_t number);
41     static void AddTask(Task &&task);
42     static void Destroy();
43 
44     void Init(int32_t number);
45 
46     void AddNewTask(Task &&task);
47 
GetThreadNumber()48     int32_t GetThreadNumber() const
49     {
50         return threadNumber_;
51     }
52 
53 private:
54     void ThreadRun(int32_t threadIndex);
55     void RunTask(Task &&task, int32_t index);
56     int32_t AcquireWorkIndex();
57 
ThreadExecute(void * context,int32_t threadIndex)58     static void ThreadExecute(void* context, int32_t threadIndex)
59     {
60         ((ThreadPool*)context)->ThreadRun(threadIndex);
61     }
62 
ThreadPool()63     ThreadPool()
64     {
65     }
66     ~ThreadPool();
67 
68 private:
69     static constexpr int32_t threadPoolMaxTasks = 1;
70     std::vector<std::thread> workers_;
71     std::atomic<bool> stop_ = { false };
72 
73     std::vector<TaskNode> taskQueue_;
74     std::mutex queueMutex_;
75     int32_t threadNumber_ = 0;
76 };
77 } // namespace Uscript
78 #endif
79