/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the test suite 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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/


#include <QtTest/QtTest>

#include <QCoreApplication>
#include <QReadLocker>
#include <QSemaphore>
#include <QThread>

//TESTED_CLASS=
//TESTED_FILES=

class tst_QReadLockerThread : public QThread
{
public:
    QReadWriteLock lock;
    QSemaphore semaphore, testSemaphore;

    void waitForTest()
    {
        semaphore.release();
        testSemaphore.acquire();
    }
};

class tst_QReadLocker : public QObject
{
    Q_OBJECT

public:
    tst_QReadLocker();
    ~tst_QReadLocker();

    tst_QReadLockerThread *thread;

    void waitForThread()
    {
        thread->semaphore.acquire();
    }
    void releaseThread()
    {
        thread->testSemaphore.release();
    }

private slots:
    void scopeTest();
    void unlockAndRelockTest();
    void lockerStateTest();
};

tst_QReadLocker::tst_QReadLocker()
{
}

tst_QReadLocker::~tst_QReadLocker()
{
}

void tst_QReadLocker::scopeTest()
{
    class ScopeTestThread : public tst_QReadLockerThread
    {
    public:
        void run()
        {
            waitForTest();

            {
                QReadLocker locker(&lock);
                waitForTest();
            }

            waitForTest();
        }
    };

    thread = new ScopeTestThread;
    thread->start();

    waitForThread();
    // lock should be unlocked before entering the scope that creates the QReadLocker
    QVERIFY(thread->lock.tryLockForWrite());
    thread->lock.unlock();
    releaseThread();

    waitForThread();
    // lock should be locked by the QReadLocker
    QVERIFY(!thread->lock.tryLockForWrite());
    releaseThread();

    waitForThread();
    // lock should be unlocked when the QReadLocker goes out of scope
    QVERIFY(thread->lock.tryLockForWrite());
    thread->lock.unlock();
    releaseThread();

    QVERIFY(thread->wait());

    delete thread;
    thread = 0;
}


void tst_QReadLocker::unlockAndRelockTest()
{
    class UnlockAndRelockThread : public tst_QReadLockerThread
    {
    public:
        void run()
        {
            QReadLocker locker(&lock);

            waitForTest();

            locker.unlock();

            waitForTest();

            locker.relock();

            waitForTest();
        }
    };

    thread = new UnlockAndRelockThread;
    thread->start();

    waitForThread();
    // lock should be locked by the QReadLocker
    QVERIFY(!thread->lock.tryLockForWrite());
    releaseThread();

    waitForThread();
    // lock has been explicitly unlocked via QReadLocker
    QVERIFY(thread->lock.tryLockForWrite());
    thread->lock.unlock();
    releaseThread();

    waitForThread();
    // lock has been explicity relocked via QReadLocker
    QVERIFY(!thread->lock.tryLockForWrite());
    releaseThread();

    QVERIFY(thread->wait());

    delete thread;
    thread = 0;
}

void tst_QReadLocker::lockerStateTest()
{
#if QT_VERSION < 0x040200
    QSKIP("QReadLocker doesn't keep state in Qt < 4.2", SkipAll);
#else
    class LockerStateThread : public tst_QReadLockerThread
    {
    public:
        void run()
        {
            {
                QReadLocker locker(&lock);
                locker.relock();
                locker.unlock();

                waitForTest();
            }

            waitForTest();
        }
    };

    thread = new LockerStateThread;
    thread->start();

    waitForThread();
    // even though we relock() after creating the QReadLocker, it shouldn't lock the lock more than once
    QVERIFY(thread->lock.tryLockForWrite());
    thread->lock.unlock();
    releaseThread();

    waitForThread();
    // if we call QReadLocker::unlock(), its destructor should do nothing
    QVERIFY(thread->lock.tryLockForWrite());
    thread->lock.unlock();
    releaseThread();

    QVERIFY(thread->wait());

    delete thread;
    thread = 0;
#endif
}

QTEST_MAIN(tst_QReadLocker)
#include "tst_qreadlocker.moc"