[Qt-interest] Qthread takes a long time to stop

[Jeroen De Wachter]

Hi Sarvesh,

Do you know if the delay is in processing the message or getting the 
message?
Because if your getmessage() function is a blocking call and it waits 
for a message from the server (or for a timeout to occur), that may be a 
lot more important than the overhead of processing the message.

Kind regards,

Jeroen


Sarvesh Saran wrote:
>
> Hi,
>
> I have a helper thread derived from QThread which runs in a forever 
> loop. Inside the loop it reads messages from a server , does some 
> processing of the messages and send the message to the Main GUI thread.
>
> So the helper thread looks something like:
>
> Helperthread::run()
>
> {
>
> while(allowedToRun())
>
> {
>
> QString msg;
>
> getmessage(&msg); //read a message from the server
>
> processMessage(msg);
>
> }
>
> }
>
> Helperthread::processMessage()
>
> {
>
> //lots of case statements here….(to identify message types) and lots 
> of message processing
>
> }
>
> //this is a public slot called by the main GUI thread
>
> Helperthread::setAllowedToRun()
>
> {
>
> //set the flag to false;
>
> }
>
> My problem is that when the main window gets a close signal, it sets 
> the flag to false and has to wait for a long time for the helper 
> thread to finish.
>
> i.e in the main window on close :
>
> MainWindow::closeEvent()
>
> {
>
> helperthread->setAllowedToRun(false);
>
> helperthread->wait(); //this takes a long time because the helper 
> thread’s processMessage is quiet big and takes a long while to return.
>
> }
>
> Is there a way I can speed this up so that my main window does not 
> have to wait for a long time for the helper thread to exit ?
>
> Thanks,
>
> Sarvesh
>
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>
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