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Diffstat (limited to 'tests/auto/corelib/thread/qthreadonce/qthreadonce.h')
-rw-r--r-- | tests/auto/corelib/thread/qthreadonce/qthreadonce.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/tests/auto/corelib/thread/qthreadonce/qthreadonce.h b/tests/auto/corelib/thread/qthreadonce/qthreadonce.h new file mode 100644 index 0000000000..c33625cbde --- /dev/null +++ b/tests/auto/corelib/thread/qthreadonce/qthreadonce.h @@ -0,0 +1,114 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the test suite 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 QTHREADONCE_H +#define QTHREADONCE_H + +#include <QtCore/qglobal.h> +#include <QtCore/qatomic.h> + +QT_BEGIN_HEADER + +QT_MODULE(Core) + +#ifndef QT_NO_THREAD + +class QOnceControl +{ +public: + QOnceControl(QBasicAtomicInt *); + ~QOnceControl(); + + bool mustRunCode(); + void done(); + +private: + QBasicAtomicInt *gv; + union { + qint32 extra; + void *d; + }; +}; + +#define Q_ONCE_GV_NAME2(prefix, line) prefix ## line +#define Q_ONCE_GV_NAME(prefix, line) Q_ONCE_GV_NAME2(prefix, line) +#define Q_ONCE_GV Q_ONCE_GV_NAME(_q_once_, __LINE__) + +#define Q_ONCE \ + static QBasicAtomicInt Q_ONCE_GV = Q_BASIC_ATOMIC_INITIALIZER(0); \ + if (0){} else \ + for (QOnceControl _control_(&Q_ONCE_GV); _control_.mustRunCode(); _control_.done()) + +template<typename T> +class QSingleton +{ + // this is a POD-like class + struct Destructor + { + T *&pointer; + Destructor(T *&ptr) : pointer(ptr) {} + ~Destructor() { delete pointer; } + }; + +public: + T *_q_value; + QBasicAtomicInt _q_guard; + + inline T *value() + { + for (QOnceControl control(&_q_guard); control.mustRunCode(); control.done()) { + _q_value = new T(); + static Destructor cleanup(_q_value); + } + return _q_value; + } + + inline T& operator*() { return *value(); } + inline T* operator->() { return value(); } + inline operator T*() { return value(); } +}; + +#endif // QT_NO_THREAD + +QT_END_HEADER + +#endif |