f9f395c28b
Updated version of LGPL and FDL licenseheaders. Apply release phase licenseheaders for all source files. Reviewed-by: Trust Me
115 lines
3.2 KiB
C++
115 lines
3.2 KiB
C++
/****************************************************************************
|
|
**
|
|
** 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
|