pdb attach?

[Hynek Hanke]

Hello,

please, is there something like 'attach' in pdb yet? My application uses 
threads
and when it freezes (e.g. due to a deadlock situation), I'd like to get 
the traceback
of all threads and inspect at which point did the application get into 
problems.
Or could I send a signal to such a python process so that it would 
output backtraces
from all threads before terminating?

Because currently, if a thread runs into deadlock problems (or a thread 
fails on
an exception and the other thread can't join it), I have no way of 
determining
what went wrong.

Such processes are not possible to terminate via CTRL-C in the 
interpreter, so
I can't get the backtrace this way. Furthermore, I also need to debug 
subprocesses,
so these are difficult to invoke interactively.

I'm happy for any suggestions.

Thank you,
Hynek Hanke