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/*
* Copyright (C) 2014 Christian Mollekopf <chrigi_1@fastmail.fm>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) version 3, or any
* later version accepted by the membership of KDE e.V. (or its
* successor approved by the membership of KDE e.V.), which shall
* act as a proxy defined in Section 6 of version 3 of the license.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "threadboundary.h"
#include <QThread>
Q_DECLARE_METATYPE(std::function<void()>);
namespace async {
ThreadBoundary::ThreadBoundary() : QObject()
{
qRegisterMetaType<std::function<void()>>("std::function<void()>");
}
ThreadBoundary::~ThreadBoundary()
{
}
void ThreadBoundary::callInMainThread(std::function<void()> f)
{
/*
* This implementation causes lambdas to pile up if the target thread is the same as the caller thread, or the caller thread calls faster
* than the target thread is able to execute the function calls. In that case any captures will equally pile up, resulting
* in significant memory usage i.e. due to Emitter::addHandler calls that each capture a domain object.
*/
if (QThread::currentThread() == this->thread()) {
f();
} else {
QMetaObject::invokeMethod(this, "runInMainThread", Qt::QueuedConnection, QGenericReturnArgument(), Q_ARG(std::function<void()>, f));
}
}
void ThreadBoundary::runInMainThread(std::function<void()> f)
{
f();
}
}
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