Headless Application Crash when closing the user interface

For some reason, my application without head started crashing whenever the user interface is closed. Here is the stack trace that I get headless application when I close the user interface:

Thread [1] (STOPPED) (Suspended : Signal : SIGSEGV:Segmentation fault)
    QHostAddressPrivate::clear() at qhostaddress.cpp:293 0x1822926c
    QAbstractSocket::disconnectFromHostImplementation() at qabstractsocket.cpp:2,714 0x18243466
    qt_static_metacall() at moc_qabstractsocket.cpp:154 0x18245fa8
    QAbstractSocket::qt_static_metacall() at moc_qabstractsocket.cpp:140 0x18245fa8
    QMetaMethod::invoke() at qmetaobject.cpp:1,664 0x196a47d8
    QMetaObject::invokeMethod() at qmetaobject.cpp:1,179 0x196a6334
    invokeMethod() at qobjectdefs.h:418 0x182421e0
    QAbstractSocket::disconnectFromHost() at qabstractsocket.cpp:2,609 0x182421e0
    QAbstractSocketPrivate::canReadNotification() at qabstractsocket.cpp:634 0x18244974
    QAbstractSocketEngine::readNotification() at qabstractsocketengine.cpp:168 0x18237a60
    event() at qnativesocketengine.cpp:1,159 0x1824aeba
    QReadNotifier::event() at qnativesocketengine.cpp:1,156 0x1824aeba
    QCoreApplicationPrivate::notify_helper() at qcoreapplication.cpp:1,083 0x1969e00e
    QCoreApplication::notifyInternal() at qcoreapplication.cpp:953 0x1969de60
    sendEvent() at qcoreapplication.h:231 0x196c379e
    QEventDispatcherUNIX::activateSocketNotifiers() at qeventdispatcher_unix.cpp:894 0x196c379e
    QEventDispatcherUNIXPrivate::doSelect() at qeventdispatcher_unix.cpp:291 0x196c4042
    QEventDispatcherUNIX::processEvents() at qeventdispatcher_unix.cpp:936 0x196c42f0
    QEventLoop::processEvents() at qeventloop.cpp:149 0x1969cace
    QEventLoop::exec() at qeventloop.cpp:204 0x1969cd28
    QCoreApplication::exec() at qcoreapplication.cpp:1,225 0x196a0eda
    main() at main.cpp:39 0x10659de4

Now, you will see the entire track, with the exception of the entrance of main(), seems to be part of the loop of events or other system libraries. Anyone happen to know what is happening here or be willing to help?

Thanks in advance!

Well, I found a solution for the bug here. I was using sockets to communicate between my headless and requests for benefits and in my slot look for disconnect events in my application without a head, I got this code:

void disconnected()
{
    ...
    _socket->close();
    delete _socket;
    ...
}

I then changed this slot to look something like this, that solved my problem:

void disconnected()
{
    ...
    _socket->close();
    _socket->deleteLater();
    ...
}

My guess is that I tried to remove the plug while he was still waiting to be delivered to her events. Using deleteLater(), the event loop is responsible for the removal of the plug once all the events have been delivered, preventing the application from crashing.

Tags: BlackBerry Developers

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