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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QWINDOWSTHREADPOOLRUNNER_H
#define QWINDOWSTHREADPOOLRUNNER_H
#include <QtCore/QMutex>
#include <QtCore/QRunnable>
#include <QtCore/QThreadPool>
#include <QtCore/QWaitCondition>
QT_BEGIN_NAMESPACE
/*!
\class QWindowsThreadPoolRunner
\brief Runs a task in the global instance of QThreadPool
QThreadPool does not provide a method to wait on a single task, so this needs
to be done by using QWaitCondition/QMutex.
\internal
\ingroup qt-lighthouse-win
*/
class QWindowsThreadPoolRunner
{
Q_DISABLE_COPY(QWindowsThreadPoolRunner)
#ifndef QT_NO_THREAD
template <class RunnableFunction> // nested class implementing QRunnable to execute a function.
class Runnable : public QRunnable
{
public:
explicit Runnable(QMutex *m, QWaitCondition *c, RunnableFunction f)
: m_mutex(m), m_condition(c), m_function(f) {}
void run() Q_DECL_OVERRIDE
{
m_function();
m_mutex->lock();
m_condition->wakeAll();
m_mutex->unlock();
}
private:
QMutex *m_mutex;
QWaitCondition *m_condition;
RunnableFunction m_function;
}; // class Runnable
public:
QWindowsThreadPoolRunner() {}
template <class Function>
bool run(Function f, unsigned long timeOutMSecs = 5000)
{
QThreadPool *pool = QThreadPool::globalInstance();
Q_ASSERT(pool);
Runnable<Function> *runnable = new Runnable<Function>(&m_mutex, &m_condition, f);
m_mutex.lock();
pool->start(runnable);
const bool ok = m_condition.wait(&m_mutex, timeOutMSecs);
m_mutex.unlock();
if (!ok)
pool->cancel(runnable);
return ok;
}
private:
QMutex m_mutex;
QWaitCondition m_condition;
#else // !QT_NO_THREAD
public:
QWindowsThreadPoolRunner() {}
template <class Function>
bool run(Function f, unsigned long /* timeOutMSecs */ = 5000)
{
f();
return true;
}
#endif // QT_NO_THREAD
};
QT_END_NAMESPACE
#endif // QWINDOWSTHREADPOOLRUNNER_H
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