tests/auto/qreadlocker/tst_qreadlocker.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 19 Feb 2010 23:40:16 +0200
branchRCL_3
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Revision: 201003 Kit: 201007
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the test suite of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtTest/QtTest>
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#include <QCoreApplication>
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#include <QReadLocker>
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#include <QSemaphore>
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#include <QThread>
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//TESTED_CLASS=
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//TESTED_FILES=
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class tst_QReadLockerThread : public QThread
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{
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public:
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    QReadWriteLock lock;
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    QSemaphore semaphore, testSemaphore;
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    void waitForTest()
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    {
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        semaphore.release();
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        testSemaphore.acquire();
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    }
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};
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class tst_QReadLocker : public QObject
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{
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    Q_OBJECT
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public:
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    tst_QReadLocker();
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    ~tst_QReadLocker();
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    tst_QReadLockerThread *thread;
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    void waitForThread()
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    {
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        thread->semaphore.acquire();
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    }
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    void releaseThread()
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    {
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        thread->testSemaphore.release();
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    }
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private slots:
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    void scopeTest();
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    void unlockAndRelockTest();
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    void lockerStateTest();
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};
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tst_QReadLocker::tst_QReadLocker()
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{
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}
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tst_QReadLocker::~tst_QReadLocker()
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{
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}
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void tst_QReadLocker::scopeTest()
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{
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    class ScopeTestThread : public tst_QReadLockerThread
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    {
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    public:
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        void run()
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        {
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            waitForTest();
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            {
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                QReadLocker locker(&lock);
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                waitForTest();
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            }
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            waitForTest();
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        }
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    };
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    thread = new ScopeTestThread;
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    thread->start();
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    waitForThread();
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    // lock should be unlocked before entering the scope that creates the QReadLocker
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    QVERIFY(thread->lock.tryLockForWrite());
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    thread->lock.unlock();
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    releaseThread();
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    waitForThread();
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    // lock should be locked by the QReadLocker
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    QVERIFY(!thread->lock.tryLockForWrite());
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    releaseThread();
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    waitForThread();
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    // lock should be unlocked when the QReadLocker goes out of scope
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    QVERIFY(thread->lock.tryLockForWrite());
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    thread->lock.unlock();
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    releaseThread();
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    QVERIFY(thread->wait());
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    delete thread;
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    thread = 0;
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}
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void tst_QReadLocker::unlockAndRelockTest()
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{
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    class UnlockAndRelockThread : public tst_QReadLockerThread
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    {
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    public:
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        void run()
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        {
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            QReadLocker locker(&lock);
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            waitForTest();
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            locker.unlock();
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            waitForTest();
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            locker.relock();
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            waitForTest();
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        }
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    };
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    thread = new UnlockAndRelockThread;
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    thread->start();
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    waitForThread();
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    // lock should be locked by the QReadLocker
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    QVERIFY(!thread->lock.tryLockForWrite());
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    releaseThread();
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    waitForThread();
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    // lock has been explicitly unlocked via QReadLocker
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    QVERIFY(thread->lock.tryLockForWrite());
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    thread->lock.unlock();
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    releaseThread();
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    waitForThread();
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    // lock has been explicity relocked via QReadLocker
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    QVERIFY(!thread->lock.tryLockForWrite());
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    releaseThread();
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    QVERIFY(thread->wait());
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    delete thread;
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    thread = 0;
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}
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void tst_QReadLocker::lockerStateTest()
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{
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    class LockerStateThread : public tst_QReadLockerThread
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    {
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    public:
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        void run()
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        {
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            {
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                QReadLocker locker(&lock);
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                locker.relock();
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                locker.unlock();
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                waitForTest();
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            }
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            waitForTest();
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        }
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    };
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    thread = new LockerStateThread;
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    thread->start();
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    waitForThread();
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    // even though we relock() after creating the QReadLocker, it shouldn't lock the lock more than once
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    QVERIFY(thread->lock.tryLockForWrite());
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    thread->lock.unlock();
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    releaseThread();
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    waitForThread();
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    // if we call QReadLocker::unlock(), its destructor should do nothing
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    QVERIFY(thread->lock.tryLockForWrite());
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    thread->lock.unlock();
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    releaseThread();
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    QVERIFY(thread->wait());
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    delete thread;
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    thread = 0;
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}
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QTEST_MAIN(tst_QReadLocker)
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#include "tst_qreadlocker.moc"