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Diffstat (limited to 'src/corelib/kernel/qsharedmemory_p.h')
-rw-r--r-- | src/corelib/kernel/qsharedmemory_p.h | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/src/corelib/kernel/qsharedmemory_p.h b/src/corelib/kernel/qsharedmemory_p.h new file mode 100644 index 0000000..08f0321 --- /dev/null +++ b/src/corelib/kernel/qsharedmemory_p.h @@ -0,0 +1,169 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (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 qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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 + |