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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QSHAREDMEMORY_H
#define QSHAREDMEMORY_H
#include <QtCore/qglobal.h>
#ifndef QT_NO_QOBJECT
# include <QtCore/qobject.h>
#else
# include <QtCore/qobjectdefs.h>
# include <QtCore/qscopedpointer.h>
# include <QtCore/qstring.h>
#endif
QT_BEGIN_NAMESPACE
#if QT_CONFIG(sharedmemory)
class QSharedMemoryPrivate;
class Q_CORE_EXPORT QSharedMemory : public QObject
{
Q_OBJECT
Q_DECLARE_PRIVATE(QSharedMemory)
public:
enum AccessMode
{
ReadOnly,
ReadWrite
};
enum SharedMemoryError
{
NoError,
PermissionDenied,
InvalidSize,
KeyError,
AlreadyExists,
NotFound,
LockError,
OutOfResources,
UnknownError
};
QSharedMemory(QObject *parent = nullptr);
QSharedMemory(const QString &key, QObject *parent = nullptr);
~QSharedMemory();
void setKey(const QString &key);
QString key() const;
void setNativeKey(const QString &key);
QString nativeKey() const;
bool create(qsizetype size, AccessMode mode = ReadWrite);
qsizetype size() const;
bool attach(AccessMode mode = ReadWrite);
bool isAttached() const;
bool detach();
void *data();
const void* constData() const;
const void *data() const;
#if QT_CONFIG(systemsemaphore)
bool lock();
bool unlock();
#endif
SharedMemoryError error() const;
QString errorString() const;
private:
Q_DISABLE_COPY(QSharedMemory)
};
#endif // QT_CONFIG(sharedmemory)
QT_END_NAMESPACE
#endif // QSHAREDMEMORY_H
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