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 #include "thread_pool.h"
16 #include <cstring>
17 #include "script_utils.h"
18 #include <unistd.h>
19
20 namespace Uscript {
21 static thread_local float g_scriptProportion = 1.0f;
22 static ThreadPool* g_threadPool = nullptr;
23 static std::mutex g_initMutex;
24
SetScriptProportion(float proportion)25 void SetScriptProportion(float proportion)
26 {
27 g_scriptProportion = proportion;
28 }
29
GetScriptProportion()30 float GetScriptProportion()
31 {
32 return g_scriptProportion;
33 }
34
CreateThreadPool(int number)35 ThreadPool* ThreadPool::CreateThreadPool(int number)
36 {
37 std::lock_guard<std::mutex> lock(g_initMutex);
38 if (g_threadPool != nullptr) {
39 return g_threadPool;
40 }
41 g_threadPool = new ThreadPool();
42 g_threadPool->Init(number);
43 return g_threadPool;
44 }
45
Destroy()46 void ThreadPool::Destroy()
47 {
48 if (g_threadPool == nullptr) {
49 return;
50 }
51 std::lock_guard<std::mutex> lock(g_initMutex);
52 delete g_threadPool;
53 g_threadPool = nullptr;
54 }
55
Init(int32_t number)56 void ThreadPool::Init(int32_t number)
57 {
58 threadNumber_ = number;
59 taskQueue_.resize(threadPoolMaxTasks);
60 for (size_t t = 0; t < taskQueue_.size(); ++t) {
61 taskQueue_[t].available = true;
62 for (int32_t i = 0; i < threadNumber_; ++i) {
63 taskQueue_[t].subTaskFlag.emplace_back(new std::atomic_bool { false });
64 }
65 }
66 // Create workers
67 for (int32_t threadIndex = 0; threadIndex < threadNumber_; ++threadIndex) {
68 workers_.emplace_back(std::thread(ThreadPool::ThreadExecute, this, threadIndex));
69 }
70 }
71
ThreadRun(int32_t threadIndex)72 void ThreadPool::ThreadRun(int32_t threadIndex)
73 {
74 USCRIPT_LOGI("Create new thread successfully, tid: %d", gettid());
75 while (!stop_) {
76 for (int32_t k = 0; k < threadPoolMaxTasks; ++k) {
77 if (*taskQueue_[k].subTaskFlag[threadIndex]) {
78 taskQueue_[k].task.processor(threadIndex);
79 *taskQueue_[k].subTaskFlag[threadIndex] = false;
80 }
81 }
82 std::this_thread::sleep_for(std::chrono::milliseconds(50)); // 50ms
83 }
84 }
85
~ThreadPool()86 ThreadPool::~ThreadPool()
87 {
88 {
89 std::lock_guard<std::mutex> lock(queueMutex_);
90 stop_ = true;
91 }
92 for (auto& worker : workers_) {
93 worker.join();
94 }
95 for (auto& task : taskQueue_) {
96 for (auto c : task.subTaskFlag) {
97 delete c;
98 }
99 }
100 }
101
AddTask(Task && task)102 void ThreadPool::AddTask(Task &&task)
103 {
104 if (g_threadPool != nullptr) {
105 g_threadPool->AddNewTask(std::move(task));
106 }
107 }
108
AddNewTask(Task && task)109 void ThreadPool::AddNewTask(Task &&task)
110 {
111 int32_t index = AcquireWorkIndex();
112 if (index < 0) {
113 USCRIPT_LOGI("ThreadPool::AddNewTask Failed");
114 return;
115 }
116
117 RunTask(std::move(task), index);
118 // Works done. make this task available
119 std::lock_guard<std::mutex> lock(queueMutex_);
120 taskQueue_[index].available = true;
121 }
122
AcquireWorkIndex()123 int32_t ThreadPool::AcquireWorkIndex()
124 {
125 std::lock_guard<std::mutex> lock(queueMutex_);
126 for (int32_t i = 0; i < threadPoolMaxTasks; ++i) {
127 if (taskQueue_[i].available) {
128 taskQueue_[i].available = false;
129 return i;
130 }
131 }
132 return -1;
133 }
134
RunTask(Task && task,int32_t index)135 void ThreadPool::RunTask(Task &&task, int32_t index)
136 {
137 int32_t workSize = task.workSize;
138 taskQueue_[index].task = std::move(task);
139 // Mark each task should be executed
140 int32_t num = workSize > threadNumber_ ? threadNumber_ : workSize;
141 for (int32_t i = 0; i < num; ++i) {
142 *taskQueue_[index].subTaskFlag[i] = true;
143 }
144
145 bool complete = true;
146 do {
147 std::this_thread::sleep_for(std::chrono::milliseconds(50)); // 50ms
148 complete = true;
149 // 检查是否所有子任务执行结束
150 for (int32_t i = 0; i < num; ++i) {
151 if (*taskQueue_[index].subTaskFlag[i]) {
152 complete = false;
153 break;
154 }
155 }
156 } while (!complete);
157 }
158 } // namespace Uscript
159