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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://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.LGPL3 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-3.0.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 (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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].load();
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;
};
QT_END_NAMESPACE
#endif // QT_NO_THREAD
#endif // QMUTEXPOOL_P_H
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