mirror of
https://github.com/Xaymar/obs-StreamFX
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72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
/*
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* Modern effects for a modern Streamer
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* Copyright (C) 2020 Michael Fabian Dirks
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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 General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "util-threadpool.hpp"
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#include <cstddef>
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// Most Tasks likely wait for IO, so we can use that time for other tasks.
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#define CONCURRENCY_MULTIPLIER 2
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util::threadpool::threadpool() : _workers(), _worker_stop(false), _tasks(), _tasks_lock(), _tasks_cv()
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{
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std::size_t concurrency = static_cast<size_t>(std::thread::hardware_concurrency()) * CONCURRENCY_MULTIPLIER;
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for (std::size_t n = 0; n < concurrency; n++) {
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_workers.emplace_back(std::bind(&util::threadpool::work, this));
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}
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}
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util::threadpool::~threadpool()
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{
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_worker_stop = true;
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_tasks_cv.notify_all();
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for (auto& thread : _workers) {
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_tasks_cv.notify_all();
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if (thread.joinable())
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thread.join();
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}
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}
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void util::threadpool::push(threadpool_function_t fn, std::shared_ptr<void> data)
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{
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std::unique_lock<std::mutex> lock(_tasks_lock);
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_tasks.emplace_back(fn, data);
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_tasks_cv.notify_one();
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}
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void util::threadpool::work()
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{
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while (!_worker_stop) {
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std::pair<threadpool_function_t, std::shared_ptr<void>> work;
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// Wait for more work, or immediately continue if there is still work to do.
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{
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std::unique_lock<std::mutex> lock(_tasks_lock);
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if (_tasks.size() == 0)
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_tasks_cv.wait(lock, [this]() { return _worker_stop || _tasks.size() > 0; });
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if (_worker_stop || (_tasks.size() == 0))
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continue;
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work = _tasks.front();
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_tasks.pop_front();
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}
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// Execute work.
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if (work.first)
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work.first(work.second);
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}
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}
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