1 files changed, 937 insertions, 0 deletions

diff --git a/tests/auto/corelib/kernel/qeventloop/tst_qeventloop.cpp b/tests/auto/corelib/kernel/qeventloop/tst_qeventloop.cpp
new file mode 100644
index 0000000000..6f8a75ed3d
--- /dev/null
+++ b/tests/auto/corelib/kernel/qeventloop/tst_qeventloop.cpp
@@ -0,0 +1,937 @@
+/****************************************************************************
+**
+** 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.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+#include <QtTest/QtTest>
+
+
+#include <qabstracteventdispatcher.h>
+#include <qcoreapplication.h>
+#include <qcoreevent.h>
+#include <qeventloop.h>
+#include <qmutex.h>
+#include <qthread.h>
+#include <qtimer.h>
+#include <qwaitcondition.h>
+#include <QTcpServer>
+#include <QTcpSocket>
+
+#ifdef Q_OS_SYMBIAN
+#include <e32base.h>
+#include <unistd.h>
+#endif
+
+#include "../../../../shared/util.h"
+
+//TESTED_CLASS=
+//TESTED_FILES=
+
+class EventLoopExiter : public QObject
+{
+    Q_OBJECT
+    QEventLoop *eventLoop;
+public:
+    inline EventLoopExiter(QEventLoop *el)
+        : eventLoop(el)
+    { }
+public slots:
+    void exit();
+    void exit1();
+    void exit2();
+};
+
+void EventLoopExiter::exit()
+{ eventLoop->exit(); }
+
+void EventLoopExiter::exit1()
+{ eventLoop->exit(1); }
+
+void EventLoopExiter::exit2()
+{ eventLoop->exit(2); }
+
+class EventLoopThread : public QThread
+{
+    Q_OBJECT
+signals:
+    void checkPoint();
+public:
+    QEventLoop *eventLoop;
+    void run();
+};
+
+void EventLoopThread::run()
+{
+    eventLoop = new QEventLoop;
+    emit checkPoint();
+    (void) eventLoop->exec();
+    delete eventLoop;
+    eventLoop = 0;
+}
+
+class MultipleExecThread : public QThread
+{
+    Q_OBJECT
+signals:
+    void checkPoint();
+public:
+    QMutex mutex;
+    QWaitCondition cond;
+    volatile int result1;
+    volatile int result2;
+    MultipleExecThread() : result1(0xdead), result2(0xbeef) {}
+
+    void run()
+    {
+        QMutexLocker locker(&mutex);
+        // this exec should work
+
+        cond.wakeOne();
+        cond.wait(&mutex);
+
+        QTimer timer;
+        connect(&timer, SIGNAL(timeout()), SLOT(quit()), Qt::DirectConnection);
+        timer.setInterval(1000);
+        timer.start();
+        result1 = exec();
+
+        // this should return immediately, since exit() has been called
+        cond.wakeOne();
+        cond.wait(&mutex);
+        QEventLoop eventLoop;
+        result2 = eventLoop.exec();
+    }
+};
+
+class StartStopEvent: public QEvent
+{
+public:
+    StartStopEvent(int type, QEventLoop *loop = 0)
+        : QEvent(Type(type)), el(loop)
+    { }
+
+    QEventLoop *el;
+};
+
+class EventLoopExecutor : public QObject
+{
+    Q_OBJECT
+    QEventLoop *eventLoop;
+public:
+    int returnCode;
+    EventLoopExecutor(QEventLoop *eventLoop)
+        : QObject(), eventLoop(eventLoop), returnCode(-42)
+    {
+    }
+public slots:
+    void exec()
+    {
+        QTimer::singleShot(100, eventLoop, SLOT(quit()));
+        // this should return immediately, and the timer event should be delivered to
+        // tst_QEventLoop::exec() test, letting the test complete
+        returnCode = eventLoop->exec();
+    }
+};
+
+#ifndef QT_NO_EXCEPTIONS
+class QEventLoopTestException { };
+
+class ExceptionThrower : public QObject
+{
+    Q_OBJECT
+public:
+    ExceptionThrower() : QObject() { }
+public slots:
+    void throwException()
+    {
+        QEventLoopTestException e;
+        throw e;
+    }
+};
+#endif
+
+class tst_QEventLoop : public QObject
+{
+    Q_OBJECT
+public:
+    tst_QEventLoop();
+    ~tst_QEventLoop();
+public slots:
+    void init();
+    void cleanup();
+private slots:
+    // This test *must* run first. See the definition for why.
+    void onlySymbianActiveScheduler();
+    void symbianNestedActiveSchedulerLoop_data();
+    void symbianNestedActiveSchedulerLoop();
+    void processEvents();
+    void exec();
+    void throwInExec();
+    void reexec();
+    void exit();
+    void execAfterExit();
+    void wakeUp();
+    void quit();
+    void processEventsExcludeSocket();
+    void processEventsExcludeTimers();
+    void deliverInDefinedOrder_QTBUG19637();
+
+    // keep this test last:
+    void nestedLoops();
+
+protected:
+    void customEvent(QEvent *e);
+};
+
+tst_QEventLoop::tst_QEventLoop()
+{ }
+
+tst_QEventLoop::~tst_QEventLoop()
+{ }
+
+void tst_QEventLoop::init()
+{ }
+
+void tst_QEventLoop::cleanup()
+{ }
+
+#ifdef Q_OS_SYMBIAN
+class OnlySymbianActiveScheduler_helper : public QObject
+{
+    Q_OBJECT
+
+public:
+    OnlySymbianActiveScheduler_helper(int fd, QTimer *zeroTimer)
+        : fd(fd),
+          timerCount(0),
+          zeroTimer(zeroTimer),
+          zeroTimerCount(0),
+          notifierCount(0)
+    {
+    }
+    ~OnlySymbianActiveScheduler_helper() {}
+
+public slots:
+    void timerSlot()
+    {
+        // Let all the events occur twice so we know they reactivated after
+        // each occurrence.
+        if (++timerCount >= 2) {
+            // This will hopefully run last, so stop the active scheduler.
+            CActiveScheduler::Stop();
+        }
+    }
+    void zeroTimerSlot()
+    {
+        if (++zeroTimerCount >= 2) {
+            zeroTimer->stop();
+        }
+    }
+    void notifierSlot()
+    {
+        if (++notifierCount >= 2) {
+            char dummy;
+            ::read(fd, &dummy, 1);
+        }
+    }
+
+private:
+    int fd;
+    int timerCount;
+    QTimer *zeroTimer;
+    int zeroTimerCount;
+    int notifierCount;
+};
+#endif
+
+void tst_QEventLoop::onlySymbianActiveScheduler() {
+#ifndef Q_OS_SYMBIAN
+    QSKIP("This is a Symbian-only test.", SkipAll);
+#else
+    // In here we try to use timers and sockets exclusively using the Symbian
+    // active scheduler and no processEvents().
+    // This test should therefore be run first, so that we can verify that
+    // the first occurrence of processEvents does not do any initialization that
+    // we depend on.
+
+    // Open up a pipe so we can test socket notifiers.
+    int pipeEnds[2];
+    if (::pipe(pipeEnds) != 0) {
+        QFAIL("Could not open pipe");
+    }
+    QSocketNotifier notifier(pipeEnds[0], QSocketNotifier::Read);
+    QSignalSpy notifierSpy(&notifier, SIGNAL(activated(int)));
+    char dummy = 1;
+    ::write(pipeEnds[1], &dummy, 1);
+
+    QTimer zeroTimer;
+    QSignalSpy zeroTimerSpy(&zeroTimer, SIGNAL(timeout()));
+    zeroTimer.setInterval(0);
+    zeroTimer.start();
+
+    QTimer timer;
+    QSignalSpy timerSpy(&timer, SIGNAL(timeout()));
+    timer.setInterval(2000); // Generous timeout or this test will fail if there is high load
+    timer.start();
+
+    OnlySymbianActiveScheduler_helper helper(pipeEnds[0], &zeroTimer);
+    connect(&notifier, SIGNAL(activated(int)), &helper, SLOT(notifierSlot()));
+    connect(&zeroTimer, SIGNAL(timeout()), &helper, SLOT(zeroTimerSlot()));
+    connect(&timer, SIGNAL(timeout()), &helper, SLOT(timerSlot()));
+
+    CActiveScheduler::Start();
+
+    ::close(pipeEnds[1]);
+    ::close(pipeEnds[0]);
+
+    QCOMPARE(notifierSpy.count(), 2);
+    QCOMPARE(zeroTimerSpy.count(), 2);
+    QCOMPARE(timerSpy.count(), 2);
+#endif
+}
+
+void tst_QEventLoop::processEvents()
+{
+    QSignalSpy spy1(QAbstractEventDispatcher::instance(), SIGNAL(aboutToBlock()));
+    QSignalSpy spy2(QAbstractEventDispatcher::instance(), SIGNAL(awake()));
+
+    QEventLoop eventLoop;
+
+    QCoreApplication::postEvent(&eventLoop, new QEvent(QEvent::User));
+
+    // process posted events, QEventLoop::processEvents() should return
+    // true
+    QVERIFY(eventLoop.processEvents());
+    QCOMPARE(spy1.count(), 0);
+    QCOMPARE(spy2.count(), 1);
+
+    // allow any session manager to complete its handshake, so that
+    // there are no pending events left.
+    while (eventLoop.processEvents())
+        ;
+
+    // On mac we get application started events at this point,
+    // so process events one more time just to be sure.
+    eventLoop.processEvents();
+
+    // no events to process, QEventLoop::processEvents() should return
+    // false
+    spy1.clear();
+    spy2.clear();
+    QVERIFY(!eventLoop.processEvents());
+    QCOMPARE(spy1.count(), 0);
+    QCOMPARE(spy2.count(), 1);
+
+    // make sure the test doesn't block forever
+    int timerId = startTimer(100);
+
+    // wait for more events to process, QEventLoop::processEvents()
+    // should return true
+    spy1.clear();
+    spy2.clear();
+    QVERIFY(eventLoop.processEvents(QEventLoop::WaitForMoreEvents));
+
+    // Verify that the eventloop has blocked and woken up. Some eventloops
+    // may block and wake up multiple times.
+    QVERIFY(spy1.count() > 0);
+    QVERIFY(spy2.count() > 0);
+    // We should get one awake for each aboutToBlock, plus one awake when
+    // processEvents is entered.
+    QVERIFY(spy2.count() >= spy1.count());
+
+    killTimer(timerId);
+}
+
+#if defined(Q_OS_SYMBIAN) && defined(Q_CC_NOKIAX86)
+// Symbian needs bit longer timeout for emulator, as emulator startup causes additional delay
+#  define EXEC_TIMEOUT 1000
+#else
+#  define EXEC_TIMEOUT 100
+#endif
+
+
+void tst_QEventLoop::exec()
+{
+    {
+        QEventLoop eventLoop;
+        EventLoopExiter exiter(&eventLoop);
+        int returnCode;
+
+        QTimer::singleShot(EXEC_TIMEOUT, &exiter, SLOT(exit()));
+        returnCode = eventLoop.exec();
+        QCOMPARE(returnCode, 0);
+
+        QTimer::singleShot(EXEC_TIMEOUT, &exiter, SLOT(exit1()));
+        returnCode = eventLoop.exec();
+        QCOMPARE(returnCode, 1);
+
+        QTimer::singleShot(EXEC_TIMEOUT, &exiter, SLOT(exit2()));
+        returnCode = eventLoop.exec();
+        QCOMPARE(returnCode, 2);
+    }
+
+    {
+        // calling QEventLoop::exec() after a thread loop has exit()ed should return immediately
+        // Note: this behaviour differs from QCoreApplication and QEventLoop
+        // see tst_QCoreApplication::eventLoopExecAfterExit, tst_QEventLoop::reexec
+        MultipleExecThread thread;
+
+        // start thread and wait for checkpoint
+        thread.mutex.lock();
+        thread.start();
+        thread.cond.wait(&thread.mutex);
+
+        // make sure the eventloop runs
+        QSignalSpy spy(QAbstractEventDispatcher::instance(&thread), SIGNAL(awake()));
+        thread.cond.wakeOne();
+        thread.cond.wait(&thread.mutex);
+        QVERIFY(spy.count() > 0);
+        int v = thread.result1;
+        QCOMPARE(v, 0);
+
+        // exec should return immediately
+        spy.clear();
+        thread.cond.wakeOne();
+        thread.mutex.unlock();
+        thread.wait();
+        QCOMPARE(spy.count(), 0);
+        v = thread.result2;
+        QCOMPARE(v, -1);
+    }
+
+    {
+        // a single instance of QEventLoop should not be allowed to recurse into exec()
+        QEventLoop eventLoop;
+        EventLoopExecutor executor(&eventLoop);
+
+        QTimer::singleShot(EXEC_TIMEOUT, &executor, SLOT(exec()));
+        int returnCode = eventLoop.exec();
+        QCOMPARE(returnCode, 0);
+        QCOMPARE(executor.returnCode, -1);
+    }
+}
+
+void tst_QEventLoop::throwInExec()
+{
+#if defined(QT_NO_EXCEPTIONS) || defined(NO_EVENTLOOP_EXCEPTIONS)
+    QSKIP("Exceptions are disabled", SkipAll);
+#elif defined(Q_OS_WINCE_WM) || defined(Q_OS_SYMBIAN)
+    // Windows Mobile cannot handle cross library exceptions
+    // qobject.cpp will try to rethrow the exception after handling
+    // which causes gwes.exe to crash
+
+    // Symbian doesn't propagate exceptions from eventloop, but converts them to
+    // CActiveScheduler errors instead -> this test will hang.
+    QSKIP("This platform doesn't support propagating exceptions through the event loop", SkipAll);
+#elif defined(Q_OS_LINUX)
+    // C++ exceptions can't be passed through glib callbacks.  Skip the test if
+    // we're using the glib event loop.
+    QByteArray dispatcher = QAbstractEventDispatcher::instance()->metaObject()->className();
+    if (dispatcher.contains("Glib")) {
+        QSKIP(
+            qPrintable(QString(
+                "Throwing exceptions in exec() won't work if %1 event dispatcher is used.\n"
+                "Try running with QT_NO_GLIB=1 in environment."
+            ).arg(QString::fromLatin1(dispatcher))),
+            SkipAll
+        );
+    }
+#endif
+
+    {
+        // QEventLoop::exec() is exception safe
+        QEventLoop eventLoop;
+        int caughtExceptions = 0;
+
+        try {
+            ExceptionThrower exceptionThrower;
+            QTimer::singleShot(EXEC_TIMEOUT, &exceptionThrower, SLOT(throwException()));
+            (void) eventLoop.exec();
+        } catch (...) {
+            ++caughtExceptions;
+        }
+        try {
+            ExceptionThrower exceptionThrower;
+            QTimer::singleShot(EXEC_TIMEOUT, &exceptionThrower, SLOT(throwException()));
+            (void) eventLoop.exec();
+        } catch (...) {
+            ++caughtExceptions;
+        }
+        QCOMPARE(caughtExceptions, 2);
+    }
+}
+
+void tst_QEventLoop::reexec()
+{
+    QEventLoop loop;
+
+    // exec once
+    QMetaObject::invokeMethod(&loop, "quit", Qt::QueuedConnection);
+    QCOMPARE(loop.exec(), 0);
+
+    // and again
+    QMetaObject::invokeMethod(&loop, "quit", Qt::QueuedConnection);
+    QCOMPARE(loop.exec(), 0);
+}
+
+void tst_QEventLoop::exit()
+{ DEPENDS_ON(exec()); }
+
+void tst_QEventLoop::execAfterExit()
+{
+    QEventLoop loop;
+    EventLoopExiter obj(&loop);
+
+    QMetaObject::invokeMethod(&obj, "exit", Qt::QueuedConnection);
+    loop.exit(1);
+    QCOMPARE(loop.exec(), 0);
+}
+
+void tst_QEventLoop::wakeUp()
+{
+    EventLoopThread thread;
+    QEventLoop eventLoop;
+    connect(&thread, SIGNAL(checkPoint()), &eventLoop, SLOT(quit()));
+    connect(&thread, SIGNAL(finished()), &eventLoop, SLOT(quit()));
+
+    thread.start();
+    (void) eventLoop.exec();
+
+    QSignalSpy spy(QAbstractEventDispatcher::instance(&thread), SIGNAL(awake()));
+    thread.eventLoop->wakeUp();
+
+    // give the thread time to wake up
+    QTimer::singleShot(1000, &eventLoop, SLOT(quit()));
+    (void) eventLoop.exec();
+
+    QVERIFY(spy.count() > 0);
+
+    thread.quit();
+    (void) eventLoop.exec();
+}
+
+void tst_QEventLoop::quit()
+{
+    QEventLoop eventLoop;
+    int returnCode;
+
+    QTimer::singleShot(100, &eventLoop, SLOT(quit()));
+    returnCode = eventLoop.exec();
+    QCOMPARE(returnCode, 0);
+}
+
+
+void tst_QEventLoop::nestedLoops()
+{
+    QCoreApplication::postEvent(this, new StartStopEvent(QEvent::User));
+    QCoreApplication::postEvent(this, new StartStopEvent(QEvent::User));
+    QCoreApplication::postEvent(this, new StartStopEvent(QEvent::User));
+
+    // without the fix, this will *wedge* and never return
+    QTest::qWait(1000);
+}
+
+void tst_QEventLoop::customEvent(QEvent *e)
+{
+    if (e->type() == QEvent::User) {
+        QEventLoop loop;
+        QCoreApplication::postEvent(this, new StartStopEvent(int(QEvent::User) + 1, &loop));
+        loop.exec();
+    } else {
+        static_cast<StartStopEvent *>(e)->el->exit();
+    }
+}
+
+class SocketEventsTester: public QObject
+{
+    Q_OBJECT
+public:
+    SocketEventsTester()
+    {
+        socket = 0;
+        server = 0;
+        dataArrived = false;
+        testResult = false;
+    }
+    ~SocketEventsTester()
+    {
+        delete socket;
+        delete server;
+    }
+    bool init()
+    {
+        bool ret = false;
+        server = new QTcpServer();
+        socket = new QTcpSocket();
+        connect(server, SIGNAL(newConnection()), this, SLOT(sendHello()));
+        connect(socket, SIGNAL(readyRead()), this, SLOT(sendAck()), Qt::DirectConnection);
+        if((ret = server->listen(QHostAddress::LocalHost, 0))) {
+            socket->connectToHost(server->serverAddress(), server->serverPort());
+            socket->waitForConnected();
+        }
+        return ret;
+    }
+
+    QTcpSocket *socket;
+    QTcpServer *server;
+    bool dataArrived;
+    bool testResult;
+public slots:
+    void sendAck()
+    {
+        dataArrived = true;
+    }
+    void sendHello()
+    {
+        char data[10] ="HELLO";
+        qint64 size = sizeof(data);
+
+        QTcpSocket *serverSocket = server->nextPendingConnection();
+        serverSocket->write(data, size);
+        serverSocket->flush();
+        QTest::qSleep(200); //allow the TCP/IP stack time to loopback the data, so our socket is ready to read
+        QCoreApplication::processEvents(QEventLoop::ExcludeSocketNotifiers);
+        testResult = dataArrived;
+        QCoreApplication::processEvents(); //check the deferred event is processed
+        serverSocket->close();
+        QThread::currentThread()->exit(0);
+    }
+};
+
+class SocketTestThread : public QThread
+{
+    Q_OBJECT
+public:
+    SocketTestThread():QThread(0),testResult(false){};
+    void run()
+    {
+        SocketEventsTester *tester = new SocketEventsTester();
+        if (tester->init())
+            exec();
+        testResult = tester->testResult;
+        dataArrived = tester->dataArrived;
+        delete tester;
+    }
+     bool testResult;
+     bool dataArrived;
+};
+
+void tst_QEventLoop::processEventsExcludeSocket()
+{
+    SocketTestThread thread;
+    thread.start();
+    QVERIFY(thread.wait());
+    QVERIFY(!thread.testResult);
+    QVERIFY(thread.dataArrived);
+}
+
+class TimerReceiver : public QObject
+{
+public:
+    int gotTimerEvent;
+
+    TimerReceiver()
+        : QObject(), gotTimerEvent(-1)
+    { }
+
+    void timerEvent(QTimerEvent *event)
+    {
+        gotTimerEvent = event->timerId();
+    }
+};
+
+void tst_QEventLoop::processEventsExcludeTimers()
+{
+    TimerReceiver timerReceiver;
+    int timerId = timerReceiver.startTimer(0);
+
+    QEventLoop eventLoop;
+
+    // normal process events will send timers
+    eventLoop.processEvents();
+    QCOMPARE(timerReceiver.gotTimerEvent, timerId);
+    timerReceiver.gotTimerEvent = -1;
+
+    // normal process events will send timers
+    eventLoop.processEvents(QEventLoop::X11ExcludeTimers);
+#if !defined(Q_OS_UNIX) || defined(Q_OS_SYMBIAN)
+    QEXPECT_FAIL("", "X11ExcludeTimers only works on UN*X", Continue);
+#endif
+    QCOMPARE(timerReceiver.gotTimerEvent, -1);
+    timerReceiver.gotTimerEvent = -1;
+
+    // resume timer processing
+    eventLoop.processEvents();
+    QCOMPARE(timerReceiver.gotTimerEvent, timerId);
+    timerReceiver.gotTimerEvent = -1;
+}
+
+#ifdef Q_OS_SYMBIAN
+class DummyActiveObject : public CActive
+{
+public:
+    DummyActiveObject(int levels);
+    ~DummyActiveObject();
+
+    void Start();
+
+protected:
+    void DoCancel();
+    void RunL();
+
+public:
+    bool succeeded;
+
+private:
+    RTimer m_rTimer;
+    int remainingLevels;
+};
+
+class ActiveSchedulerLoop : public QObject
+{
+public:
+    ActiveSchedulerLoop(int levels) : succeeded(false), timerId(-1), remainingLevels(levels) {}
+    ~ActiveSchedulerLoop() {}
+
+    void timerEvent(QTimerEvent *e);
+
+public:
+    bool succeeded;
+    int timerId;
+    int remainingLevels;
+};
+
+DummyActiveObject::DummyActiveObject(int levels)
+    : CActive(CActive::EPriorityStandard),
+      succeeded(false),
+      remainingLevels(levels)
+{
+    m_rTimer.CreateLocal();
+}
+
+DummyActiveObject::~DummyActiveObject()
+{
+    Cancel();
+    m_rTimer.Close();
+}
+
+void DummyActiveObject::DoCancel()
+{
+    m_rTimer.Cancel();
+}
+
+void DummyActiveObject::RunL()
+{
+    if (remainingLevels - 1 <= 0) {
+        ActiveSchedulerLoop loop(remainingLevels - 1);
+        loop.timerId = loop.startTimer(0);
+        QCoreApplication::processEvents();
+
+        succeeded = loop.succeeded;
+    } else {
+        succeeded = true;
+    }
+    CActiveScheduler::Stop();
+}
+
+void DummyActiveObject::Start()
+{
+    m_rTimer.After(iStatus, 100000); // 100 ms
+    SetActive();
+}
+
+void ActiveSchedulerLoop::timerEvent(QTimerEvent *e)
+{
+    Q_UNUSED(e);
+    DummyActiveObject *dummy = new(ELeave) DummyActiveObject(remainingLevels);
+    CActiveScheduler::Add(dummy);
+
+    dummy->Start();
+
+    CActiveScheduler::Start();
+
+    succeeded = dummy->succeeded;
+
+    delete dummy;
+
+    killTimer(timerId);
+}
+
+// We cannot trap panics when the test case fails, so run it in a different thread instead.
+class ActiveSchedulerThread : public QThread
+{
+public:
+    ActiveSchedulerThread(QEventLoop::ProcessEventsFlag flags);
+    ~ActiveSchedulerThread();
+
+protected:
+    void run();
+
+public:
+    volatile bool succeeded;
+
+private:
+    QEventLoop::ProcessEventsFlag m_flags;
+};
+
+ActiveSchedulerThread::ActiveSchedulerThread(QEventLoop::ProcessEventsFlag flags)
+    : succeeded(false),
+      m_flags(flags)
+{
+}
+
+ActiveSchedulerThread::~ActiveSchedulerThread()
+{
+}
+
+void ActiveSchedulerThread::run()
+{
+    ActiveSchedulerLoop loop(2);
+    loop.timerId = loop.startTimer(0);
+    // It may panic in here if the active scheduler and the Qt loop don't go together.
+    QCoreApplication::processEvents(m_flags);
+
+    succeeded = loop.succeeded;
+}
+#endif // ifdef Q_OS_SYMBIAN
+
+void tst_QEventLoop::symbianNestedActiveSchedulerLoop_data()
+{
+    QTest::addColumn<int>("processEventFlags");
+
+    QTest::newRow("AllEvents") << (int)QEventLoop::AllEvents;
+    QTest::newRow("WaitForMoreEvents") << (int)QEventLoop::WaitForMoreEvents;
+}
+
+/*
+  Before you start fiddling with this test, you should have a good understanding of how
+  Symbian active objects work. What the test does is to try to screw up the semaphore count
+  in the active scheduler to cause stray signals, by running the Qt event loop and the
+  active scheduler inside each other. Naturally, its attempts to do this should be futile!
+*/
+void tst_QEventLoop::symbianNestedActiveSchedulerLoop()
+{
+#ifndef Q_OS_SYMBIAN
+    QSKIP("This is a Symbian only test.", SkipAll);
+#else
+    QFETCH(int, processEventFlags);
+
+    ActiveSchedulerThread thread((QEventLoop::ProcessEventsFlag)processEventFlags);
+    thread.start();
+    thread.wait(2000);
+
+    QVERIFY(thread.succeeded);
+#endif
+}
+
+Q_DECLARE_METATYPE(QThread*)
+
+namespace DeliverInDefinedOrder_QTBUG19637 {
+    enum { NbThread = 3,  NbObject = 500, NbEventQueue = 5, NbEvent = 50 };
+
+    struct CustomEvent : public QEvent {
+        CustomEvent(int q, int v) : QEvent(Type(User + q)), value(v) {}
+        int value;
+    };
+
+    struct Object : public QObject {
+        Q_OBJECT
+    public:
+        Object() : count(0) {
+            for (int i = 0; i < NbEventQueue;  i++)
+                lastReceived[i] = -1;
+        }
+        int lastReceived[NbEventQueue];
+        int count;
+        virtual void customEvent(QEvent* e) {
+            QVERIFY(e->type() >= QEvent::User);
+            QVERIFY(e->type() < QEvent::User + 5);
+            uint idx = e->type() - QEvent::User;
+            int value = static_cast<CustomEvent *>(e)->value;
+            QVERIFY(lastReceived[idx] < value);
+            lastReceived[idx] = value;
+            count++;
+        }
+
+    public slots:
+        void moveToThread(QThread *t) {
+            QObject::moveToThread(t);
+        }
+    };
+
+}
+
+void tst_QEventLoop::deliverInDefinedOrder_QTBUG19637()
+{
+    using namespace DeliverInDefinedOrder_QTBUG19637;
+    qMetaTypeId<QThread*>();
+    QThread threads[NbThread];
+    Object objects[NbObject];
+    for (int t = 0; t < NbThread; t++) {
+        threads[t].start();
+    }
+
+    int event = 0;
+
+    for (int o = 0; o < NbObject; o++) {
+        objects[o].moveToThread(&threads[o % NbThread]);
+        for (int e = 0; e < NbEvent; e++) {
+            int q = e % NbEventQueue;
+            QCoreApplication::postEvent(&objects[o], new CustomEvent(q, ++event) , q);
+            if (e % 7)
+                QMetaObject::invokeMethod(&objects[o], "moveToThread", Qt::QueuedConnection, Q_ARG(QThread*, &threads[(e+o)%NbThread]));
+        }
+    }
+
+    QTest::qWait(30);
+    for (int o = 0; o < NbObject; o++) {
+        QTRY_COMPARE(objects[o].count, int(NbEvent));
+    }
+
+    for (int t = 0; t < NbThread; t++) {
+        threads[t].quit();
+        threads[t].wait();
+    }
+
+}
+
+
+QTEST_MAIN(tst_QEventLoop)
+#include "tst_qeventloop.moc"