[Qt-interest] QThread eventloop problems

[Thiago Macieira]

Em Quinta-feira 25 Fevereiro 2010, às 18:50:20, Sergey Shekyan escreveu:
> Hi,
> 
> I am trying to have multithreaded app with QWebPage isntance in every
> thread. 

You can't do that. QtWebKit is not thread-safe.

You can only use it from the main thread.

> the way I am creating it is:
> 
> void
>  MyServer::incomingConnection(int socketDescriptor)
>   {
>     MyThread* thread = new MyThread(this, socketDescriptor);
>     connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));
>     thread->start();
>    }
> 
> and run() of MyThread is:
> void
>   MyThread::run(){
>     MyPage page(sockfd);
>     exec();
>   }
> 
> where, MyPage is subclassed from QObject, and has QWebPage member pointer,
> and slots to handle signals from QWebPage.
> 
> So the problem is everything works if I am creating MyPage in main event
> loop, and looks like I don't have the event loop, and no signals of
> QWebPage are triggered if MyPage is in MyThread. What am I doing wrong?

You didn't post the part where you connect the signals. Remember that MyThread 
is an object that lives in the main thread, so any signals you connect from 
MyPage to MyThread will be delivered in the main thread, not in MyThread's 
thread.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
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