[Interest] QObject: Cannot create children for a parent that is in a different thread.

[Celal SAVUR]

Hello Thiago,

Actually I just find out that the C function which I am calling in Qt, is
creating a thread. I do not have any control over this thread. The library
I am using that have callback interface and whenever data available it
calls my callback method in Qt.

So, in order to solve this problem, what should I do?

By the way, my application does not crash so I don't have backtrace.

Thank you in advance.







Celal SAVUR



On Tue, Aug 18, 2015 at 5:30 PM, Thiago Macieira <thiago.macieira at intel.com>
wrote:

> On Tuesday 18 August 2015 14:23:05 Thiago Macieira wrote:
> > On Tuesday 18 August 2015 16:33:39 Celal SAVUR wrote:
> > > Hello everyone,
> > >
> > > I am keep getting this warning. Although I am not using thread. Do you
> > > have
> > > any idea?
> > >
> > > QObject: Cannot create children for a parent that is in a different
> > > thread.
> >
> > I think you are using threads. Please run your application with
> > QT_FATAL_WARNINGS=1 set in the environment and pastebin the backtrace.
>
> I can tell from the pointer values that you have multiple threads:
>
> > > (Parent is QHeaderView(0x1fee070), parent's thread is
> QThread(0x81dc70),
> > > current thread is QThread(0x7fff88000b00)
>
> The low-value pointers are heap allocations from the main thread's heap
> pool.
> The high pointer value for the second QThread is a heap allocation from a
> secondary thread's pool.
>
> The pointer value isn't that of the QThread object, but of the internal
> QThreadData and that one is created inside each thread. Since we have a
> pointer that comes from the heap pool of an auxiliary thread, we conclude
> an
> auxiliary thread was started.
>
> So you are using threads.
>
> --
> Thiago Macieira - thiago.macieira (AT) intel.com
>   Software Architect - Intel Open Source Technology Center
>
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