On Mar 18, 2009, at 2:17 PM, Martin Gysel wrote:
> Hi
>
> I have a 'cython' class which interfaces c code. therefor I need some
> callback functions which I declared outside of the class. Over a
> userdata argument pointer this function gets the reference of my
> class.
> Callback registration and also the callback itself work. The
> problem is,
> as soon as the callback starts to execute, I'll get a segfault (from
> time to time it also works...). So I debugged the c code, the segfault
> occurs while getting the sdtout for the print statement. So I removed
> all print statements but from my callback I want to call either a
> function of my class or some python callback (which needs to be
> registered first). For me it seems the segfault occurs when accessing
> some python objects. I also tried to play around with 'which gil' and
> 'nogil' but no luck. When using 'which gil' it segfaults
> immediately the
> callback gets called.
> What do I wrong? I assume it should be possible to have print in
> callback functions and also to have access to python objects.
Yes, that should be possible. It does sound like you're having
threading/gil issues. What is your callback function signature? When
you say you've tried "with gil" are you doing
cdef void my_callback(void *data) with gil:
...
- Robert
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