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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSHAREDMEMORY_P_H
#define QSHAREDMEMORY_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "qsharedmemory.h"
#ifdef QT_NO_SHAREDMEMORY
# ifndef QT_NO_SYSTEMSEMAPHORE
namespace QSharedMemoryPrivate
{
int createUnixKeyFile(const QString &fileName);
QString makePlatformSafeKey(const QString &key,
const QString &prefix = QLatin1String("qipc_sharedmemory_"));
}
#endif
#else
#include "qsystemsemaphore.h"
#include "private/qobject_p.h"
#ifdef Q_OS_WIN
#include <qt_windows.h>
#else
#include <sys/sem.h>
#endif
QT_BEGIN_NAMESPACE
#ifndef QT_NO_SYSTEMSEMAPHORE
/*!
Helper class
*/
class QSharedMemoryLocker
{
public:
inline QSharedMemoryLocker(QSharedMemory *sharedMemory) : q_sm(sharedMemory)
{
Q_ASSERT(q_sm);
}
inline ~QSharedMemoryLocker()
{
if (q_sm)
q_sm->unlock();
}
inline bool lock()
{
if (q_sm && q_sm->lock())
return true;
q_sm = 0;
return false;
}
private:
QSharedMemory *q_sm;
};
#endif // QT_NO_SYSTEMSEMAPHORE
class Q_AUTOTEST_EXPORT QSharedMemoryPrivate : public QObjectPrivate
{
Q_DECLARE_PUBLIC(QSharedMemory)
public:
QSharedMemoryPrivate();
void *memory;
int size;
QString key;
QSharedMemory::SharedMemoryError error;
QString errorString;
#ifndef QT_NO_SYSTEMSEMAPHORE
QSystemSemaphore systemSemaphore;
bool lockedByMe;
#endif
static int createUnixKeyFile(const QString &fileName);
static QString makePlatformSafeKey(const QString &key,
const QString &prefix = QLatin1String("qipc_sharedmemory_"));
#ifdef Q_OS_WIN
HANDLE handle();
#else
key_t handle();
#endif
bool initKey();
bool cleanHandle();
bool create(int size);
bool attach(QSharedMemory::AccessMode mode);
bool detach();
void setErrorString(const QString &function);
#ifndef QT_NO_SYSTEMSEMAPHORE
bool tryLocker(QSharedMemoryLocker *locker, const QString function) {
if (!locker->lock()) {
errorString = QSharedMemory::tr("%1: unable to lock").arg(function);
error = QSharedMemory::LockError;
return false;
}
return true;
}
#endif // QT_NO_SYSTEMSEMAPHORE
private:
#ifdef Q_OS_WIN
HANDLE hand;
#else
key_t unix_key;
#endif
};
QT_END_NAMESPACE
#endif // QT_NO_SHAREDMEMORY
#endif // QSHAREDMEMORY_P_H
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