GDB pretty-printers for glibc?

[Paul Smith]

Does anyone have any GDB pretty-printers created for GNU libc data
structures?  I wonder if something like this (once developed) shouldn't
be added to the GNU libc release and installed by default.

I'm thinking in particular of pretty-printers for things like
pthread_mutex_t, pthread_cond_t, FILE, etc. but I'm sure there are
other types which could benefit from pretty-printing.