| /* |
| * Copyright (C) 2004-2023 Savoir-faire Linux Inc. |
| * |
| * This program is free software: you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation, either version 3 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <https://www.gnu.org/licenses/>. |
| */ |
| #pragma once |
| |
| #include <atomic> |
| #include <thread> |
| #include <functional> |
| #include <stdexcept> |
| #include <condition_variable> |
| #include <mutex> |
| |
| #include <opendht/logger.h> |
| |
| namespace dhtnet { |
| |
| struct ThreadLoopException : public std::runtime_error |
| { |
| ThreadLoopException() |
| : std::runtime_error("ThreadLoopException") |
| {} |
| }; |
| |
| class ThreadLoop |
| { |
| public: |
| enum class ThreadState { READY, RUNNING, STOPPING }; |
| |
| ThreadLoop(std::shared_ptr<dht::log::Logger> logger, |
| const std::function<bool()>& setup, |
| const std::function<void()>& process, |
| const std::function<void()>& cleanup); |
| virtual ~ThreadLoop(); |
| |
| void start(); |
| void exit(); |
| virtual void stop(); |
| void join(); |
| void waitForCompletion(); // thread will stop itself |
| |
| bool isRunning() const noexcept; |
| bool isStopping() const noexcept { return state_ == ThreadState::STOPPING; } |
| std::thread::id get_id() const noexcept { return threadId_; } |
| |
| private: |
| ThreadLoop(const ThreadLoop&) = delete; |
| ThreadLoop(ThreadLoop&&) noexcept = delete; |
| ThreadLoop& operator=(const ThreadLoop&) = delete; |
| ThreadLoop& operator=(ThreadLoop&&) noexcept = delete; |
| |
| // These must be provided by users of ThreadLoop |
| std::function<bool()> setup_; |
| std::function<void()> process_; |
| std::function<void()> cleanup_; |
| |
| void mainloop(std::thread::id& tid, |
| const std::function<bool()> setup, |
| const std::function<void()> process, |
| const std::function<void()> cleanup); |
| |
| std::atomic<ThreadState> state_ {ThreadState::READY}; |
| std::thread::id threadId_; |
| std::thread thread_; |
| std::shared_ptr<dht::log::Logger> logger_; |
| }; |
| |
| class InterruptedThreadLoop : public ThreadLoop |
| { |
| public: |
| InterruptedThreadLoop(std::shared_ptr<dht::log::Logger> logger, |
| const std::function<bool()>& setup, |
| const std::function<void()>& process, |
| const std::function<void()>& cleanup) |
| : ThreadLoop::ThreadLoop(logger, setup, process, cleanup) |
| {} |
| |
| void stop() override; |
| |
| void interrupt() noexcept { cv_.notify_one(); } |
| |
| template<typename Rep, typename Period> |
| void wait_for(const std::chrono::duration<Rep, Period>& rel_time) |
| { |
| if (std::this_thread::get_id() != get_id()) |
| throw std::runtime_error("can not call wait_for outside thread context"); |
| |
| std::unique_lock lk(mutex_); |
| cv_.wait_for(lk, rel_time, [this]() { return isStopping(); }); |
| } |
| |
| template<typename Rep, typename Period, typename Pred> |
| bool wait_for(const std::chrono::duration<Rep, Period>& rel_time, Pred&& pred) |
| { |
| if (std::this_thread::get_id() != get_id()) |
| throw std::runtime_error("can not call wait_for outside thread context"); |
| |
| std::unique_lock lk(mutex_); |
| return cv_.wait_for(lk, rel_time, [this, pred] { return isStopping() || pred(); }); |
| } |
| |
| template<typename Pred> |
| void wait(Pred&& pred) |
| { |
| if (std::this_thread::get_id() != get_id()) |
| throw std::runtime_error("Can not call wait outside thread context"); |
| |
| std::unique_lock lk(mutex_); |
| cv_.wait(lk, [this, p = std::forward<Pred>(pred)] { return isStopping() || p(); }); |
| } |
| |
| private: |
| std::mutex mutex_; |
| std::condition_variable cv_; |
| }; |
| |
| } // namespace dhtnet |