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85 lines
3.0 KiB
85 lines
3.0 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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#pragma once
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#include <atomic>
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#include <cstdint>
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#include <functional>
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#include <future>
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#include <thread>
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#include "Event.h"
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#include "base/Macros.h"
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#include "base/std/container/list.h"
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#include "concurrentqueue/concurrentqueue.h"
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namespace cc {
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class ThreadPool final {
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public:
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using Task = std::function<void()>;
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using TaskQueue = moodycamel::ConcurrentQueue<Task>;
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static uint8_t const CPU_CORE_COUNT;
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static uint8_t const MAX_THREAD_COUNT;
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ThreadPool() = default;
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~ThreadPool() = default;
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ThreadPool(ThreadPool const &) = delete;
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ThreadPool(ThreadPool &&) noexcept = delete;
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ThreadPool &operator=(ThreadPool const &) = delete;
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ThreadPool &operator=(ThreadPool &&) noexcept = delete;
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template <typename Function, typename... Args>
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auto dispatchTask(Function &&func, Args &&...args) -> std::future<decltype(func(std::forward<Args>(args)...))>;
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void start();
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void stop();
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private:
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using Event = ConditionVariable;
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void addThread();
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TaskQueue _tasks{};
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ccstd::list<std::thread> _workers{};
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Event _event{};
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std::atomic<bool> _running{false};
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uint8_t _workerCount{MAX_THREAD_COUNT};
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};
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template <typename Function, typename... Args>
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auto ThreadPool::dispatchTask(Function &&func, Args &&...args) -> std::future<decltype(func(std::forward<Args>(args)...))> {
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CC_ASSERT(_running);
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using ReturnType = decltype(func(std::forward<Args>(args)...));
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auto task = std::make_shared<std::packaged_task<ReturnType()>>(std::bind(std::forward<Function>(func), std::forward<Args>(args)...));
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bool const succeed = _tasks.enqueue([task]() {
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(*task)();
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});
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CC_ASSERT(succeed);
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_event.signal();
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return task->get_future();
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}
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} // namespace cc
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