qmutexpool.cpp

Go to the documentation of this file.

/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** 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 Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/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 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, Digia gives you certain additional
** rights.  These rights are described in the Digia 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qatomic.h"
#include "qmutexpool_p.h"

#ifndef QT_NO_THREAD

QT_BEGIN_NAMESPACE

// qt_global_mutexpool is here for backwards compatibility only,
// use QMutexpool::instance() in new clode.
Q_CORE_EXPORT QMutexPool *qt_global_mutexpool = 0;
Q_GLOBAL_STATIC_WITH_ARGS(QMutexPool, globalMutexPool, (QMutex::Recursive))


QMutexPool::QMutexPool(QMutex::RecursionMode recursionMode, int size)
    : mutexes(size), recursionMode(recursionMode)
{
    for (int index = 0; index < mutexes.count(); ++index) {
        mutexes[index] = 0;
    }
}

QMutexPool::~QMutexPool()
{
    for (int index = 0; index < mutexes.count(); ++index) {
        delete mutexes[index];
        mutexes[index] = 0;
    }
}

QMutexPool *QMutexPool::instance()
{
    return globalMutexPool();
}

QMutex *QMutexPool::createMutex(int index)
{
    // mutex not created, create one
    QMutex *newMutex = new QMutex(recursionMode);
    if (!mutexes[index].testAndSetOrdered(0, newMutex))
        delete newMutex;
    return mutexes[index];
}

QMutex *QMutexPool::globalInstanceGet(const void *address)
{
    QMutexPool * const globalInstance = globalMutexPool();
    if (globalInstance == 0)
        return 0;
    return globalInstance->get(address);
}

QT_END_NAMESPACE

#endif // QT_NO_THREAD