[Python-Dev] Signals, threads, blocking C functions

Michael Hudson mwh at python.net
Wed Sep 13 10:14:42 CEST 2006

"Martin v. Löwis" <martin at v.loewis.de> writes:

> Michael Hudson schrieb:
>>> According to [1], all python needs to do to avoid this problem is
>>> block all signals in all but the main thread;
>> Argh, no: then people who call system() from non-main threads end up
>> running subprocesses with all signals masked, which breaks other
>> things in very mysterious ways.  Been there...
> Python should register a pthread_atfork handler then, which clears
> the signal mask. Would that not work?

Not for system() at least:



  ROOSTA:  Ever since you arrived on this planet last night you've
           been going round telling people that you're Zaphod
           Beeblebrox, but that they're not to tell anyone else.
                    -- The Hitch-Hikers Guide to the Galaxy, Episode 7

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