| #pragma once |
| /* |
| * (C) 2023 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| * All Rights Reserved |
| * |
| * Author: Eric Wild <ewild@sysmocom.de> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Affero 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 Affero General Public License for more details. |
| * |
| * You should have received a copy of the GNU Affero General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include <functional> |
| #include <thread> |
| #include <atomic> |
| #include <vector> |
| #include <future> |
| #include <mutex> |
| #include <queue> |
| |
| struct single_thread_pool { |
| std::mutex m; |
| std::condition_variable cv; |
| std::atomic<bool> stop_flag; |
| std::atomic<bool> is_ready; |
| std::deque<std::function<void()>> wq; |
| std::thread worker_thread; |
| |
| template <class F> |
| void add_task(F &&f) |
| { |
| std::unique_lock<std::mutex> l(m); |
| wq.emplace_back(std::forward<F>(f)); |
| cv.notify_one(); |
| return; |
| } |
| |
| single_thread_pool() : stop_flag(false), is_ready(false), worker_thread(std::thread([this] { thread_loop(); })) |
| { |
| } |
| ~single_thread_pool() |
| { |
| stop(); |
| } |
| |
| std::thread::native_handle_type get_handle() |
| { |
| return worker_thread.native_handle(); |
| } |
| |
| private: |
| void stop() |
| { |
| { |
| std::unique_lock<std::mutex> l(m); |
| wq.clear(); |
| stop_flag = true; |
| cv.notify_one(); |
| } |
| worker_thread.join(); |
| } |
| |
| void thread_loop() |
| { |
| while (true) { |
| is_ready = true; |
| std::function<void()> f; |
| { |
| std::unique_lock<std::mutex> l(m); |
| if (wq.empty()) { |
| cv.wait(l, [&] { return !wq.empty() || stop_flag; }); |
| } |
| if (stop_flag) |
| return; |
| is_ready = false; |
| f = std::move(wq.front()); |
| wq.pop_front(); |
| } |
| f(); |
| } |
| } |
| }; |