110 lines
3.3 KiB
C++
110 lines
3.3 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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}
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std::shared_ptr<::util::threadpool::task> util::threadpool::push(threadpool_callback_t fn, threadpool_data_t data)
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{
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auto task = std::make_shared<util::threadpool::task>(fn, data);
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std::unique_lock<std::mutex> lock(_tasks_lock);
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_tasks.emplace_back(task);
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_tasks_cv.notify_one();
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return task;
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}
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void util::threadpool::pop(std::shared_ptr<::util::threadpool::task> work)
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{
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if (work) {
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work->_is_dead.store(true);
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}
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}
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void util::threadpool::work()
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{
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static thread_local std::shared_ptr<util::threadpool::task> local_work{};
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while (!_worker_stop) {
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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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// Lock the tasks mutex to check for work.
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std::unique_lock<std::mutex> lock(_tasks_lock);
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// If there are currently no tasks queued, wait on the condition variable.
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// This temporarily unlocks the mutex until it is woken up.
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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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}
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// If there is either no tasks or we were asked to stop, skip everything.
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if (_worker_stop || (_tasks.size() == 0)) {
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continue;
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}
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// Grab the latest task and immediately remove it from the queue.
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local_work = _tasks.front();
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_tasks.pop_front();
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}
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// If the task was killed, skip everything again.
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if (local_work->_is_dead.load()) {
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continue;
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}
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// Try to execute work, but don't crash on catchable exceptions.
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if (local_work->_callback) {
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try {
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local_work->_callback(local_work->_data);
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} catch (std::exception const& ex) {
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} catch (...) { // This does not catch unrecoverable exceptions, or exceptions that went through C code.
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}
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}
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}
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}
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util::threadpool::task::task() {}
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util::threadpool::task::task(threadpool_callback_t fn, threadpool_data_t dt) : _callback(fn), _data(dt), _is_dead(false)
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{}
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