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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** 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 General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** 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-3.0.html.
**
****************************************************************************/
#pragma once
#include <QSharedMemory>
#include <QSystemSemaphore>
namespace QmlDesigner {
class SharedMemory
{
friend class SharedMemoryLocker;
public:
SharedMemory();
SharedMemory(const QString &key);
~SharedMemory();
void setKey(const QString &key);
QString key() const;
bool create(int size, QSharedMemory::AccessMode mode = QSharedMemory::ReadWrite);
int size() const;
bool attach(QSharedMemory::AccessMode mode = QSharedMemory::ReadWrite);
bool isAttached() const;
bool detach();
void *data();
const void* constData() const;
const void *data() const;
bool lock();
bool unlock();
QSharedMemory::SharedMemoryError error() const;
QString errorString() const;
protected:
#ifdef Q_OS_UNIX
bool initKeyInternal();
void cleanHandleInternal();
bool createInternal(QSharedMemory::AccessMode mode, size_t size);
bool attachInternal(QSharedMemory::AccessMode mode);
bool detachInternal();
int handle();
void setErrorString(const QString &function);
#endif
private:
#ifndef Q_OS_UNIX
QSharedMemory m_sharedMemory;
#else
void *m_memory;
size_t m_size;
QString m_key;
QByteArray m_nativeKey;
QSharedMemory::SharedMemoryError m_error;
QString m_errorString;
QSystemSemaphore m_systemSemaphore;
bool m_lockedByMe;
int m_fileHandle;
bool m_createdByMe;
#endif
};
} // namespace QmlDesigner
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