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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** 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 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qthreadpooler_p.h"
#include "dependencyhandler_p.h"
#include <QtCore/QThreadPool>
#include <QDebug>
QT_BEGIN_NAMESPACE
namespace Qt3D {
/*!
\class Qt3D::QThreadPoolerPrivate
\internal
*/
QThreadPooler::QThreadPooler(QObject *parent)
: QObject(parent),
m_futureInterface(Q_NULLPTR),
m_mutex(new QMutex(QMutex::NonRecursive)),
m_taskCount(0)
{
}
QThreadPooler::~QThreadPooler()
{
// Wait till all tasks are finished before deleting mutex
QMutexLocker locker(m_mutex);
locker.unlock();
delete m_mutex;
}
void QThreadPooler::setDependencyHandler(DependencyHandler *handler)
{
m_dependencyHandler = handler;
m_dependencyHandler->setMutex(m_mutex);
}
void QThreadPooler::enqueueTasks(QVector<RunnableInterface *> &tasks)
{
// The caller have to set the mutex
for (QVector<RunnableInterface *>::iterator it = tasks.begin();
it != tasks.end(); it++) {
if (!m_dependencyHandler->hasDependency((*it)) && !(*it)->reserved()) {
(*it)->setReserved(true);
(*it)->setPooler(this);
QThreadPool::globalInstance()->start((*it));
}
}
}
void QThreadPooler::taskFinished(RunnableInterface *task)
{
const QMutexLocker locker(m_mutex);
release();
QVector<RunnableInterface *> freedTasks;
if (task->dependencyHandler())
freedTasks = m_dependencyHandler->freeDependencies(task);
if (freedTasks.size())
enqueueTasks(freedTasks);
if (currentCount() == 0) {
if (m_futureInterface) {
m_futureInterface->reportFinished();
delete m_futureInterface;
}
m_futureInterface = Q_NULLPTR;
}
}
QFuture<void> QThreadPooler::mapDependables(QVector<RunnableInterface *> &taskQueue)
{
const QMutexLocker locker(m_mutex);
if (!m_futureInterface)
m_futureInterface = new QFutureInterface<void>();
if (taskQueue.size())
m_futureInterface->reportStarted();
acquire(taskQueue.size());
enqueueTasks(taskQueue);
return QFuture<void>(m_futureInterface);
}
QFuture<void> QThreadPooler::future()
{
const QMutexLocker locker(m_mutex);
if (!m_futureInterface)
return QFuture<void>();
else
return QFuture<void>(m_futureInterface);
}
void QThreadPooler::acquire(int add)
{
// The caller have to set the mutex
forever {
int localCount = m_taskCount.load();
if (m_taskCount.testAndSetOrdered(localCount, localCount + add))
return;
}
}
void QThreadPooler::release()
{
// The caller have to set the mutex
forever {
int localCount = m_taskCount.load();
// Task counter going below zero means coding errors somewhere.
Q_ASSERT(localCount > 0);
if (m_taskCount.testAndSetOrdered(localCount, localCount - 1))
return;
}
}
int QThreadPooler::currentCount()
{
// The caller have to set the mutex
return m_taskCount.load();
}
int QThreadPooler::maxThreadCount() const
{
return QThreadPool::globalInstance()->maxThreadCount();
}
} // namespace Qt3D
QT_END_NAMESPACE
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