/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
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** This file is part of the Qt3D module of the Qt Toolkit.
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** 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
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****************************************************************************/

#include "jobrunner_p.h"
#include "qthreadpooler_p.h"

#include <QtCore/QThread>
#include <QtCore/QMutexLocker>
#include <QtCore/QAtomicInt>

QT_BEGIN_NAMESPACE

namespace Qt3D {

JobRunner::JobRunner(QThreadPooler *parent)
    : QThread(parent),
      m_abort(0),
      m_pooler(parent),
      m_jobAvailable(Q_NULLPTR),
      m_mutex(Q_NULLPTR)
{
    QObject::connect(parent, SIGNAL(shuttingDown()), this, SLOT(shutDown()));
}

JobRunner::~JobRunner()
{
    shutDown();
}

void JobRunner::run()
{
    Q_ASSERT(m_jobAvailable != Q_NULLPTR);

    while (!m_abort.load()) {
        if (const QSharedPointer<TaskInterface> task = m_pooler->nextTask()) {
            m_pooler->startRunning();
            task->run(task, this);
            m_pooler->stopRunning();
        } else {
            suspend();
        }
    }
}

void JobRunner::suspend()
{
    const QMutexLocker locker(m_mutex);

    m_jobAvailable->wait(m_mutex);
}

void JobRunner::shutDown()
{
    m_abort.store(1);
}

} // namespace Qt3D

QT_END_NAMESPACE