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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QWINDOWSTHREADPOOLRUNNER_H
#define QWINDOWSTHREADPOOLRUNNER_H
#include <QtCore/qmutex.h>
#include <QtCore/qrunnable.h>
#include <QtCore/qthreadpool.h>
#include <QtCore/qwaitcondition.h>
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
*/
class QWindowsThreadPoolRunner
{
Q_DISABLE_COPY_MOVE(QWindowsThreadPoolRunner)
#if QT_CONFIG(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() 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_CONFIG(thread)
public:
QWindowsThreadPoolRunner() {}
template <class Function>
bool run(Function f, unsigned long /* timeOutMSecs */ = 5000)
{
f();
return true;
}
#endif // QT_CONFIG(thread)
};
QT_END_NAMESPACE
#endif // QWINDOWSTHREADPOOLRUNNER_H
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