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82 lines
2.3 KiB
82 lines
2.3 KiB
/****************************************************************************
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Copyright (c) 2020-2023 Xiamen Yaji Software Co., Ltd.
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http://www.cocos.com
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#include "ThreadPool.h"
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namespace cc {
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uint8_t const ThreadPool::CPU_CORE_COUNT = std::thread::hardware_concurrency();
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uint8_t const ThreadPool::MAX_THREAD_COUNT = CPU_CORE_COUNT - 1;
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void ThreadPool::start() {
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if (_running) {
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return;
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}
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_running = true;
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for (uint8_t i = 0; i < MAX_THREAD_COUNT; ++i) {
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addThread();
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}
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}
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void ThreadPool::stop() {
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if (!_running) {
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return;
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}
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_running = false;
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_event.signalAll();
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for (auto &worker : _workers) {
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if (worker.joinable()) {
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worker.join();
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}
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}
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_workers.clear();
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}
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void ThreadPool::addThread() {
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CC_ASSERT(_workers.size() < MAX_THREAD_COUNT);
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auto workerLoop = [this]() {
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while (_running) {
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Task task = nullptr;
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if (_tasks.try_dequeue(task)) {
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task();
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} else {
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// Double Check
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_event.wait([this]() {
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return _tasks.size_approx() != 0;
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});
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}
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}
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};
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_workers.emplace_back(workerLoop);
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}
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} // namespace cc
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