91 lines
2.7 KiB
C++
91 lines
2.7 KiB
C++
/**
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This file is a part of rexy's general purpose library
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Copyright (C) 2020 rexy712
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef REXY_THREADPOOL_HPP
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#define REXY_THREADPOOL_HPP
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#include <vector>
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#include <queue>
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#include <condition_variable>
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#include <mutex> //unique_lock, scoped_lock
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#include <shared_mutex> //shared_mutex, shared_lock
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#include <atomic> //atomic_bool
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#include <memory> //shared_ptr
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#include <future> //future, packaged_task
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#include <functional> //function, bind
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#include <utility> //move, forward
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namespace rexy{
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class threadpool
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{
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private:
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using mutex_t = std::shared_mutex;
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using write_lock_t = std::unique_lock<mutex_t>;
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using read_lock_t = std::shared_lock<mutex_t>;
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private:
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mutable read_lock_t m_ctor_lock;
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mutable std::condition_variable_any m_qcv;
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mutable mutex_t m_qlk;
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std::vector<std::thread> m_workers;
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std::queue<std::function<void()>> m_jobs;
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std::atomic_bool m_valid = true;
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public:
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explicit threadpool(int numthreads = std::thread::hardware_concurrency());
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threadpool(const threadpool&);
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threadpool(threadpool&&);
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~threadpool(void);
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threadpool& operator=(const threadpool&) = delete;
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threadpool& operator=(threadpool&&) = delete;
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void invalidate(void);
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template<class Func, class... Args>
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auto add_job(Func&& f, Args&&... args) -> std::future<decltype(std::forward<Func>(f)(std::forward<Args>(args)...))>;
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private:
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void worker_loop(void);
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};
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template<class Func, class... Args>
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auto threadpool::add_job(Func&& f, Args&&... args) -> std::future<decltype(std::forward<Func>(f)(std::forward<Args>(args)...))>{
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using return_t = decltype(std::forward<Func>(f)(std::forward<Args>(args)...));
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using task_t = std::packaged_task<return_t(void)>;
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//shared pointer to a packaged task which takes no arguments in operator()
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std::shared_ptr<task_t> task_ptr = std::make_shared<task_t>(std::bind(std::forward<Func>(f), std::forward<Args>(args)...));
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{
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write_lock_t lk(m_qlk);
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//make a copy of the shared pointer by capturing by-value
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m_jobs.emplace([task_ptr]{(*task_ptr)();});
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}
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//wakeup a worker to run the job
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m_qcv.notify_one();
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return task_ptr->get_future();
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}
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}
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#endif
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