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authorAlexis Menard <alexis.menard@nokia.com>2009-04-17 14:06:06 (GMT)
committerAlexis Menard <alexis.menard@nokia.com>2009-04-17 14:06:06 (GMT)
commitf15b8a83e2e51955776a3f07cb85ebfc342dd8ef (patch)
treec5dc684986051654898db11ce73e03b9fec8db99 /src/corelib/thread/qmutex.h
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Initial import of statemachine branch from the old kinetic repository
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+/****************************************************************************
+**
+** 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 QMUTEX_H
+#define QMUTEX_H
+
+#include <QtCore/qglobal.h>
+#include <new>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Core)
+
+#ifndef QT_NO_THREAD
+
+class QMutexPrivate;
+
+class Q_CORE_EXPORT QMutex
+{
+ friend class QWaitCondition;
+ friend class QWaitConditionPrivate;
+
+public:
+ enum RecursionMode { NonRecursive, Recursive };
+
+ explicit QMutex(RecursionMode mode = NonRecursive);
+ ~QMutex();
+
+ void lock();
+ bool tryLock();
+ bool tryLock(int timeout);
+ void unlock();
+
+#if defined(QT3_SUPPORT)
+ inline QT3_SUPPORT bool locked()
+ {
+ if (!tryLock())
+ return true;
+ unlock();
+ return false;
+ }
+ inline QT3_SUPPORT_CONSTRUCTOR QMutex(bool recursive)
+ {
+ new (this) QMutex(recursive ? Recursive : NonRecursive);
+ }
+#endif
+
+private:
+ Q_DISABLE_COPY(QMutex)
+
+ QMutexPrivate *d;
+};
+
+class Q_CORE_EXPORT QMutexLocker
+{
+public:
+ inline explicit QMutexLocker(QMutex *m)
+ : mtx(m)
+ {
+ Q_ASSERT_X((val & quintptr(1u)) == quintptr(0),
+ "QMutexLocker", "QMutex pointer is misaligned");
+ relock();
+ }
+ inline ~QMutexLocker() { unlock(); }
+
+ inline void unlock()
+ {
+ if (mtx) {
+ if ((val & quintptr(1u)) == quintptr(1u)) {
+ val &= ~quintptr(1u);
+ mtx->unlock();
+ }
+ }
+ }
+
+ inline void relock()
+ {
+ if (mtx) {
+ if ((val & quintptr(1u)) == quintptr(0u)) {
+ mtx->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)
+
+ union {
+ QMutex *mtx;
+ quintptr val;
+ };
+};
+
+#else // QT_NO_THREAD
+
+
+class Q_CORE_EXPORT QMutex
+{
+public:
+ enum RecursionMode { NonRecursive, Recursive };
+
+ inline explicit QMutex(RecursionMode mode = NonRecursive) { Q_UNUSED(mode); }
+ inline ~QMutex() {}
+
+ static inline void lock() {}
+ static inline bool tryLock() { return true; }
+ static inline bool tryLock(int timeout) { Q_UNUSED(timeout); return true; }
+ static void unlock() {}
+
+#if defined(QT3_SUPPORT)
+ static inline QT3_SUPPORT bool locked() { return false; }
+#endif
+
+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)
+};
+
+#endif // QT_NO_THREAD
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QMUTEX_H