[Qt-interest] QThread Question

[Bradley T. Hughes]

Donal O'Connor wrote:
> Thanks Sean for your good explanations.
> 
> William,
> I've indeed done this but had problems finding GUI thread ID but got this
> via: QApplication::instance()->thread()->currentThreadId();

Remember that QThread::currentThreadId() is a static function, always 
returning the id for the *calling* thread.

If you want to check if 2 objects have the same thread affinity, it's enough 
to compare the QThread pointers returned by QObject::thread(). For example:

     if (object->thread() != qApp->thread())
         qFatal("PANIC");

> Both the slot thead ID and the GUI thread ID match so that's enough.
>
> No wonder this application was running slow and things blocking eachother.
> 
> Thanks to everyone for their help, I've learned a lot.
> 
> 
> Regards,
> Donal
> 
> On Thu, Aug 6, 2009 at 12:30 PM, william.crocker at analog.com <
> william.crocker at analog.com> wrote:
> 
>>
>> Donal O'Connor wrote:
>>> Hi,
>>>
>>> I've got code here written by somebody else that seems to make use of
>>> several threads but I'm quite worried that the processing is not done in
>>> a different thread like intended.
>>>
>> When in doubt, print the id of the current thread from
>> the context of code in question and compare this with the
>> id of the main thread.
>>
>> QThread *QThread::currentThread ()   [static]
>>     Returns a pointer to a QThread which represents
>>     the currently executing thread.
>>
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>>
> 


-- 
Bradley T. Hughes (Nokia-D-Qt/Oslo), bradley.hughes at nokia.com
Sandakervn. 116, P.O. Box 4332 Nydalen, 0402 Oslo, Norway