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3e7f4b0da9
...so we don't spawn threads all the time. Used for gain avg/setting. Change-Id: Id675550f55e8ccbbbe6b0d91fbffd01b6ede15f7
92 lines
2.0 KiB
C++
92 lines
2.0 KiB
C++
#pragma once
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/*
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* (C) 2023 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* All Rights Reserved
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*
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* Author: Eric Wild <ewild@sysmocom.de>
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*
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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 Affero 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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*
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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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero 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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*/
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#include <functional>
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#include <thread>
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#include <atomic>
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#include <vector>
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#include <future>
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#include <mutex>
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#include <queue>
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struct single_thread_pool {
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std::mutex m;
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std::condition_variable cv;
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std::atomic<bool> stop_flag;
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std::atomic<bool> is_ready;
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std::deque<std::function<void()>> wq;
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std::thread worker_thread;
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template <class F>
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void add_task(F &&f)
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{
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std::unique_lock<std::mutex> l(m);
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wq.emplace_back(std::forward<F>(f));
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cv.notify_one();
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return;
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}
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single_thread_pool() : worker_thread(std::thread([this] { thread_loop(); }))
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{
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}
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~single_thread_pool()
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{
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stop();
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}
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std::thread::native_handle_type get_handle()
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{
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return worker_thread.native_handle();
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}
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private:
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void stop()
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{
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{
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std::unique_lock<std::mutex> l(m);
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wq.clear();
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stop_flag = true;
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cv.notify_one();
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}
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worker_thread.join();
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}
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void thread_loop()
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{
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while (true) {
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is_ready = true;
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std::function<void()> f;
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{
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std::unique_lock<std::mutex> l(m);
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if (wq.empty()) {
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cv.wait(l, [&] { return !wq.empty() || stop_flag; });
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}
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if (stop_flag)
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return;
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is_ready = false;
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f = std::move(wq.front());
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wq.pop_front();
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}
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f();
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}
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}
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}; |