[Twisted-Python] Question about processes in python

Jason J. W. Williams jasonjwwilliams at gmail.com
Mon Apr 12 12:20:31 EDT 2010

The comment about passing installSignalHandlers=False to reactor.run()
is good to know. Are the signal handlers Twisted installs used by
Twisted for anything besides reactor.spawnProcess() or other tasks
related to sub-process management?


On Mon, Apr 12, 2010 at 10:06 AM, David Ripton <dripton at ripton.net> wrote:
> On 2010.04.12 09:39:21 -0600, Jason J. W. Williams wrote:
>> Haven't had any issues yet. Twisted imports occur inside the process
>> function. The app was originally written as a purely blocking
>> multiprocessing app and rewritten to use Twisted inside the
>> sub-processes. It's passed all automated and hand tests without an
>> issue. Is there a reason importing Twisted inside sub-process should
>> not work?
> Here's JP's canonical answer:
> http://stackoverflow.com/questions/1948641/twisted-threading-with-subprocess-popen
> I've seen this problem in real code.  We had a PyGTK + Twisted program
> that erroneously used subprocess in one place.  2% of the time, it
> caused an exception.  98% of the time, it worked fine.  Classic race
> condition.  Could be you have a similar bug but it never actually
> manifests on your combination of code, OS, and hardware.  Hard to say.
> --
> David Ripton    dripton at ripton.net
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