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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation 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 Technology Preview License Agreement accompanying
** this package.
**
** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QCache>
#include <QMutex>
#include <QThreadStorage>
#include "threads.h"
//! [0]
void MyThread::run()
//! [0] //! [1]
{
//! [1] //! [2]
}
//! [2]
#define Counter ReentrantCounter
//! [3]
class Counter
//! [3] //! [4]
{
public:
Counter() { n = 0; }
void increment() { ++n; }
void decrement() { --n; }
int value() const { return n; }
private:
int n;
};
//! [4]
#undef Counter
#define Counter ThreadSafeCounter
//! [5]
class Counter
//! [5] //! [6]
{
public:
Counter() { n = 0; }
void increment() { QMutexLocker locker(&mutex); ++n; }
void decrement() { QMutexLocker locker(&mutex); --n; }
int value() const { QMutexLocker locker(&mutex); return n; }
private:
mutable QMutex mutex;
int n;
};
//! [6]
typedef int SomeClass;
//! [7]
QThreadStorage<QCache<QString, SomeClass> *> caches;
void cacheObject(const QString &key, SomeClass *object)
//! [7] //! [8]
{
if (!caches.hasLocalData())
caches.setLocalData(new QCache<QString, SomeClass>);
caches.localData()->insert(key, object);
}
void removeFromCache(const QString &key)
//! [8] //! [9]
{
if (!caches.hasLocalData())
return;
caches.localData()->remove(key);
}
//! [9]
int main()
{
return 0;
}
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