forked from qt-creator/qt-creator
0da08c227f
QSharedMemory is using SVR4 shared memory for unix which is limited to 4 MB globally which is really hurting the performance for the designer. POSIX shared memory is lifting some of this constraints but still has some bugs on Max OS but generally works better. Change-Id: I74c1ffd56495f408cd9340cd159190a1175a4086 Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
97 lines
2.9 KiB
C++
97 lines
2.9 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of Qt Creator.
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**
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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****************************************************************************/
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#ifndef QMLDESIGNER_SHAREDMEMORY_H
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#define QMLDESIGNER_SHAREDMEMORY_H
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#include <QSharedMemory>
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#include <QSystemSemaphore>
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namespace QmlDesigner {
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class SharedMemory
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{
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friend class SharedMemoryLocker;
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public:
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SharedMemory();
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SharedMemory(const QString &key);
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~SharedMemory();
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void setKey(const QString &key);
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QString key() const;
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bool create(int size, QSharedMemory::AccessMode mode = QSharedMemory::ReadWrite);
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int size() const;
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bool attach(QSharedMemory::AccessMode mode = QSharedMemory::ReadWrite);
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bool isAttached() const;
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bool detach();
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void *data();
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const void* constData() const;
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const void *data() const;
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bool lock();
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bool unlock();
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QSharedMemory::SharedMemoryError error() const;
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QString errorString() const;
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protected:
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#ifdef Q_OS_UNIX
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bool initKeyInternal();
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bool cleanHandleInternal();
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bool createInternal(QSharedMemory::AccessMode mode, int size);
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bool attachInternal(QSharedMemory::AccessMode mode);
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bool detachInternal();
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int handle();
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void setErrorString(const QString &function);
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#endif
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private:
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#ifndef Q_OS_UNIX
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QSharedMemory m_sharedMemory;
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#else
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void *m_memory;
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int m_size;
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QString m_key;
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QByteArray m_nativeKey;
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QSharedMemory::SharedMemoryError m_error;
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QString m_errorString;
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QSystemSemaphore m_systemSemaphore;
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bool m_lockedByMe;
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int m_fileHandle;
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bool m_createdByMe;
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#endif
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};
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} // namespace QmlDesigner
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#endif // QMLDESIGNER_SHAREDMEMORY_H
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