[Interest] Terminating a QThread
Etienne Sandré-Chardonnal
etienne.sandre at m4x.org
Fri Jun 21 13:00:34 CEST 2013
Sorry Mandeep, I didn't read your post first. Basically what I posted is
similar.
A mutex is a little bit overkill here, you could use an atomic variable if
you want to be sure, but just a bool flag will be enough as it is always
set atomically AFAIK
2013/6/21 Mandeep Sandhu <mandeepsandhu.chd at gmail.com>
> On Fri, Jun 21, 2013 at 1:36 PM, francois cellier <f_cellier at yahoo.fr>wrote:
>
>> Dear all,
>>
>> Even if I know that it can be dangerous to terminate a thread, I need to
>> do it for my application.
>> The function that run into the thread is like a long linear sequence of
>> code that has not been designed in a signal/slot way. Moreover, in my
>> thread, I need an eventloop as I use in it some TCP or UDP Qt sockets.
>>
>> I have tried the worker approach with the following code and I did not
>> find a way to terminate the thread :
>>
>> For my thread class :
>>
>> 1. ThreadEx::ThreadEx(QObject <http://qt-project.org/doc/QObject.html>
>> *parent) :
>> 2. QThread <http://qt-project.org/doc/QThread.html>(parent)
>> 3. {
>> 4. }
>> 5.
>> 6. void ThreadEx::run()
>> 7. {
>> 8. QThread <http://qt-project.org/doc/QThread.html>::
>> setTerminationEnabled(true);
>> 9. exec();
>> 10. }
>>
>>
>>
>> For my worker class:
>>
>> 1. ObjectInThread::ObjectInThread(QObject<http://qt-project.org/doc/QObject.html>
>> *parent) :
>> 2. QObject <http://qt-project.org/doc/QObject.html>(parent)
>> 3. {
>> 4. }
>> 5.
>> 6.
>> 7. void ObjectInThread::run()
>> 8. {
>> 9. int compteur = 0;
>> 10. //here i am using a loop instead of the long linear flow but it
>> is not a loop in the real code
>> 11. while(1)
>> 12. {
>> 13. qDebug() <<compteur;
>> 14. compteur++;
>> 15. Sleep(1000);
>> 16. }
>> 17. }
>>
>> You use a condition variable in your loop here, which will exit out of
> the run() function. This variable can be set from your stop() slot
> (protected by a mutex if needed).
> In your main(GUI) thread you can wait for your worker thread to exit:
>
> m_thread->quit();
> m_thread->wait();
>
> HTH,
> -mandeep
>
>
> This should cleanly exit the thread.
>
>
>> Moreover I tried the other way of using QThread that consists in
>> inheriting the QThread class and overriding the run method with the code :
>>
>> void ThreadEx::run()
>> {
>> int compteur = 0;
>> while(1)
>> {
>> qDebug() <<compteur;
>> compteur++;
>> sleep(1);
>> }
>> }
>>
>> In that case terminate works but I do not have an eventloop as I did not
>> call the exec method.
>>
>> Is this the expected behaviour ?
>>
>> I am using Qt5.1 on centOS / RedHat 6.2. I have also tried this on
>> Windows with no more success.
>>
>> Thanks for your help,
>> François
>>
>>
>>
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