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103 lines
2.7 KiB
103 lines
2.7 KiB
/*****************************************************************************
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* Copyright (C) 2024 VLC authors and VideoLAN
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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 "workerthreadset.hpp"
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#include <QTimer>
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WorkerThreadSet::~WorkerThreadSet()
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{
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for (auto worker : workers)
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{
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if (!worker.thread)
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continue;
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finish( worker );
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}
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}
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void WorkerThreadSet::assignToWorkerThread(QObject *obj)
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{
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auto worker = reserve();
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obj->moveToThread( worker );
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QObject::connect(obj, &QObject::destroyed, worker, [this, worker]()
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{
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unreserve( worker );
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});
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}
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void WorkerThreadSet::finish(Worker &worker)
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{
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worker.thread->quit();
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worker.thread->wait();
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delete worker.thread;
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}
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QThread *WorkerThreadSet::reserve()
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{
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auto itr = std::min_element(std::begin(workers)
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, std::end(workers)
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, [](const Worker &l, const Worker &r)
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{
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return l.load < r.load;
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});
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assert(itr != std::end(workers));
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if (!itr->thread)
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{
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itr->thread = new QThread;
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itr->thread->start();
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}
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itr->load++;
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itr->inactiveTime.invalidate();
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return itr->thread;
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}
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void WorkerThreadSet::unreserve(QThread *thread)
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{
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auto itr = std::find_if(std::begin(workers)
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, std::end(workers)
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, [thread](const Worker &i) { return i.thread == thread; });
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if (itr == std::end(workers)) return; // impossible?
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const int load = --itr->load;
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if (load != 0)
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return;
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itr->inactiveTime.start();
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QTimer::singleShot(CLEANUP_TIMEOUT, this, &WorkerThreadSet::cleanupInactiveWorker);
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}
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void WorkerThreadSet::cleanupInactiveWorker()
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{
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for (auto &worker : workers)
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{
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if ((worker.load == 0)
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&& worker.inactiveTime.hasExpired(MAX_INACTIVE_TIME)
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&& worker.thread)
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{
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finish( worker );
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worker.thread = nullptr;
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}
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}
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}
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