Re: Accessing pthread_key_create thread-specific data

Florian Weimer via Gdb
2021-03-12T16:00:26Z

* Tom Tromey:

>>>>>> "Florian" == Florian Weimer via Gdb <gdb@sourceware.org> writes:
>
> Florian> We have some functionality in libthread_db in glibc that provides access
> Florian> to pthread_key_create thread-specific data (aka pthread_setspecific and
> Florian> pthread_getspecific). I would like to write a GDB test for this
> Florian> functionality, but I can't find how GDB exposes this data in the UI. Is
> Florian> this just dead code?
>
> As far as I know, these aren't used and I think have never been used.

Thanks for conforming.

> I'm not sure how I would go about exposing this to users. The most
> natural way might be to intercept calls to pthread_*specific. Maybe a
> couple of new convenience functions would be good though, and less
> magical.
>
> I guess this would primarily be useful for core file debugging?

That's a good point. The data structures are not completely trivial to
decode even if you have debuginfo symbols.

I do not plan to work on that. I just had to make some changes on the
glibc side, but I guess I just won't be able to test them.

Thanks,
Florian