How to disable connection timer in QTcpSocket

YuriQ

Hello.
QTcpSocket creates timer to handle connection timeout. I tried to use thousands of sockets (not a typicall use case, but anyway) and got this error messages:

QEventDispatcherWin32::registerTimer: Failed to create a timer (The current process has used all of its system allowance of handles for Window Manager objects.)

I think creating timer for every socket is huge wast of system resources when you use many sockets. I can handle timeouts manually using just one single timer. But I didn't find any option to disable built-in socket connection timer. How can do it?

My environment: Qt 5.4, 5.5.1, Windows 8.1, Visual Studio 2013

SGaist

Hi,

AFAIK, there's none, you should have to modify QAbtractSocket and build your own version of Qt for that.

But use a single timeout for so many sockets ? Sounds strange.

Out of curiosity, why do you need so many sockets ?

YuriQ

@SGaist

you should have to modify QAbtractSocket

Seems like you right. The code in 'qabstractsocket.cpp':

<...skipped...>
// Start the connect timer.
if (threadData->hasEventDispatcher()) {
    if (!connectTimer) {
        connectTimer = new QTimer(q);
        QObject::connect(connectTimer, SIGNAL(timeout()),
                         q, SLOT(_q_abortConnectionAttempt()),
                         Qt::DirectConnection);
    }
    connectTimer->start(QT_CONNECT_TIMEOUT);
}
<...skipped...>

And there are no options to disable it. But I think it will be easy to patch it to make it work without connectTimer.

But use a single timeout for thought of sockets ? Sounds strange.

What else can I do to avoid handles exhaustion? I don't see any other options.

Out of curiosity, why do you need so many sockets ?

Just testing Qt abilities and limitations in this particular area.