[Qt-interest] Delete QObjects which are moved to different thread

[Wilhelm]

Am 26.10.2011 11:16, schrieb Wilhelm:
> Am 26.10.2011 09:37, schrieb Giuseppe D'Angelo:
>> On 26 October 2011 09:34, Giuseppe D'Angelo<dangelog at gmail.com> wrote:
>>> On 26 October 2011 09:27, Wilhelm<wilhelm.meier at fh-kl.de> wrote:
>>>> Hi,
>>>>
>>>> if I move a QObject to a different QThread and then destroy this object
>>>> deferred, the dtor is called by this thread, if it is running: ok.
>>>>
>>>> But if the other thread is not running, I can't use deferred deletion
>>>> since there is no running event loop.
>>>> Trying to delete the object from the main thread via delete operator,
>>>> the dtor ist called from a different thread than the main thread: I
>>>> assume the QObject-dtor detects that the object belongs to a different
>>>> thread and if that is not running it starts a new thread to execute the
>>>> dtor. Right?
>>>
>>> Wrong.
>>
>> Sorry -- I hit the "send" button instead of the "save" button. :)
>>
>> Still, it's wrong. The object gets deleted from the main thread, and
>> that's something you shouldn't do (QObjects are reentrant and not
>> thread safe -- they're supposed to be accessed only from the thread
>> they're living in).
>
> see the attached minimal example producing the following output:
>
> Test::Test(QObject*) QThread(0x25231a0)
> Worker::Worker(QObject*) QThread(0x25231a0)
> void Test::test() QThread(0x25231a0)
> virtual Worker::~Worker() QThread(0x2534390)
>
> if the thread isn't started!

Ok, sometimes asking a question is the answer ...

Sorry, I confused "living" thread (QObject::thread()) and "executing" 
thread (QObject::thread()->currentThread()).

Thanks anyway!

>
>>
>> Why did you move the object in the first place if you don't have a
>> running thread with a running event loop? Or, if that thread has
>> finished, why didn't you clean up the objects living in it?
>
> it was just curiousity!
>
>>
>> Cheers,
>> --
>> Giuseppe D'Angelo
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>
>
>
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-- 
Wilhelm