/****************************************************************************
**
** Copyright (C) 2012 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
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** 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.
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** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** 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.
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** $QT_END_LICENSE$
**
****************************************************************************/

#include "qplatformdefs.h"

#include <QtCore/qatomic.h>

// If operating system, processor, and compiler detection fails, we fall back
// to this generic, out-of-line implementation

#if defined(QATOMIC_UNIX_H)

QT_BEGIN_NAMESPACE
static pthread_mutex_t qAtomicMutex = PTHREAD_MUTEX_INITIALIZER;

Q_CORE_EXPORT
bool QAtomicOps<int>::testAndSetRelaxed(int &_q_value, int expectedValue, int newValue) Q_DECL_NOTHROW
{
    bool returnValue = false;
    pthread_mutex_lock(&qAtomicMutex);
    if (_q_value == expectedValue) {
        _q_value = newValue;
        returnValue = true;
    }
    pthread_mutex_unlock(&qAtomicMutex);
    return returnValue;
}

Q_CORE_EXPORT
bool QAtomicOps<void *>::testAndSetRelaxed(void *&_q_value, void *expectedValue, void *newValue) Q_DECL_NOTHROW
{
    bool returnValue = false;
    pthread_mutex_lock(&qAtomicMutex);
    if (_q_value == expectedValue) {
        _q_value = newValue;
        returnValue = true;
    }
    pthread_mutex_unlock(&qAtomicMutex);
    return returnValue;
}

QT_END_NAMESPACE

#endif // QATOMIC_UNIX_H
