Dumping the state of a deadlocked process

MrJean1 MrJean1 at gmail.com
Fri Oct 6 23:18:45 CEST 2006

Did you try using the signal module?  If not, a basic example is here
<http://docs.python.org/lib/node546.html> which may need to be

/Jean Brouwers

andre.naess at gmail.com wrote:
> Hi all
> I'm currently having some issues with a process getting deadlocked. The
> problem is that the only way I can seem to find information about where
> it deadlocks is by making a wild guess, insert a pdb.set_trace() before
> this point, and then step until it locks up, hoping that I've guessed
> right.
> The frustrating part is that most of the time my guesses are wrong.
> It would be really nice if I could send the python process some signal
> which would cause it to print the current stacktrace and exit
> immediately. That way I would quickly be able to pinpoint where in the
> code the deadlock happens. Java has a somewhat similar feature where
> you can send a running VM process a SIGQUIT, to which it will respond
> by dumping all current threads and lots of other information on stdout.
> Is this possible somehow?

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