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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: http://www.qt-project.org/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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 1.1, 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QMUTEX_H
#define QMUTEX_H
#include <QtCore/qglobal.h>
#include <QtCore/qatomic.h>
#include <new>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Core)
#if !defined(QT_NO_THREAD) && !defined(qdoc)
class QMutexData;
class Q_CORE_EXPORT QBasicMutex
{
public:
inline void lock() {
if (!fastTryLock())
lockInternal();
}
inline void unlock() {
Q_ASSERT(d_ptr.load()); //mutex must be locked
if (!d_ptr.testAndSetRelease(dummyLocked(), 0))
unlockInternal();
}
bool tryLock(int timeout = 0) {
return fastTryLock() || lockInternal(timeout);
}
bool isRecursive();
private:
inline bool fastTryLock() {
return d_ptr.testAndSetAcquire(0, dummyLocked());
}
bool lockInternal(int timeout = -1);
void unlockInternal();
QBasicAtomicPointer<QMutexData> d_ptr;
static inline QMutexData *dummyLocked() {
return reinterpret_cast<QMutexData *>(quintptr(1));
}
friend class QMutex;
friend class QMutexData;
};
class Q_CORE_EXPORT QMutex : public QBasicMutex {
public:
enum RecursionMode { NonRecursive, Recursive };
explicit QMutex(RecursionMode mode = NonRecursive);
~QMutex();
private:
Q_DISABLE_COPY(QMutex)
};
class Q_CORE_EXPORT QMutexLocker
{
public:
inline explicit QMutexLocker(QBasicMutex *m)
{
Q_ASSERT_X((reinterpret_cast<quintptr>(m) & quintptr(1u)) == quintptr(0),
"QMutexLocker", "QMutex pointer is misaligned");
if (m) {
m->lock();
val = reinterpret_cast<quintptr>(m) | quintptr(1u);
} else {
val = 0;
}
}
inline ~QMutexLocker() { unlock(); }
inline void unlock()
{
if ((val & quintptr(1u)) == quintptr(1u)) {
val &= ~quintptr(1u);
mutex()->unlock();
}
}
inline void relock()
{
if (val) {
if ((val & quintptr(1u)) == quintptr(0u)) {
mutex()->lock();
val |= quintptr(1u);
}
}
}
#if defined(Q_CC_MSVC)
#pragma warning( push )
#pragma warning( disable : 4312 ) // ignoring the warning from /Wp64
#endif
inline QMutex *mutex() const
{
return reinterpret_cast<QMutex *>(val & ~quintptr(1u));
}
#if defined(Q_CC_MSVC)
#pragma warning( pop )
#endif
private:
Q_DISABLE_COPY(QMutexLocker)
quintptr val;
};
#else // QT_NO_THREAD or qdoc
class Q_CORE_EXPORT QMutex
{
public:
enum RecursionMode { NonRecursive, Recursive };
inline explicit QMutex(RecursionMode mode = NonRecursive) { Q_UNUSED(mode); }
static inline void lock() {}
static inline bool tryLock(int timeout = 0) { Q_UNUSED(timeout); return true; }
static inline void unlock() {}
static inline bool isRecursive() { return true; }
private:
Q_DISABLE_COPY(QMutex)
};
class Q_CORE_EXPORT QMutexLocker
{
public:
inline explicit QMutexLocker(QMutex *) {}
inline ~QMutexLocker() {}
static inline void unlock() {}
static void relock() {}
static inline QMutex *mutex() { return 0; }
private:
Q_DISABLE_COPY(QMutexLocker)
};
typedef QMutex QBasicMutex;
#endif // QT_NO_THREAD or qdoc
QT_END_NAMESPACE
QT_END_HEADER
#endif // QMUTEX_H
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