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Diffstat (limited to 'src/corelib/doc/snippets/threads/threads.cpp')
-rw-r--r-- | src/corelib/doc/snippets/threads/threads.cpp | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/corelib/doc/snippets/threads/threads.cpp b/src/corelib/doc/snippets/threads/threads.cpp new file mode 100644 index 0000000000..9ef716705a --- /dev/null +++ b/src/corelib/doc/snippets/threads/threads.cpp @@ -0,0 +1,117 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor +** the names of its contributors may be used to endorse or promote +** products derived from this software without specific prior written +** permission. +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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] +{ + 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; +} |