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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 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 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QMUTEXPOOL_P_H
#define QMUTEXPOOL_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of QSettings. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "QtCore/qatomic.h"
#include "QtCore/qmutex.h"
#include "QtCore/qvarlengtharray.h"
#ifndef QT_NO_THREAD
QT_BEGIN_NAMESPACE
class Q_CORE_EXPORT QMutexPool
{
public:
explicit QMutexPool(QMutex::RecursionMode recursionMode = QMutex::NonRecursive, int size = 131);
~QMutexPool();
inline QMutex *get(const void *address) {
int index = uint(quintptr(address)) % mutexes.count();
QMutex *m = mutexes[index];
if (m)
return m;
else
return createMutex(index);
}
static QMutexPool *instance();
static QMutex *globalInstanceGet(const void *address);
private:
QMutex *createMutex(int index);
QVarLengthArray<QAtomicPointer<QMutex>, 131> mutexes;
QMutex::RecursionMode recursionMode;
};
extern Q_CORE_EXPORT QMutexPool *qt_global_mutexpool;
QT_END_NAMESPACE
#endif // QT_NO_THREAD
#endif // QMUTEXPOOL_P_H
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