Thanks for all the help. We're going with addSystemEventTrigger for now, but we'll keep twistd in mind for future work.
Jason On Fri, Feb 11, 2011 at 1:51 PM, Glyph Lefkowitz <gl...@twistedmatrix.com>wrote: > > On Feb 11, 2011, at 11:55 AM, exar...@twistedmatrix.com wrote: > > > On 03:59 pm, jren...@gmail.com wrote: > >> On Fri, Feb 11, 2011 at 10:01 AM, <exar...@twistedmatrix.com> wrote: > >>> On Python 2.5 and earlier you won't be able to get Twisted's SIGCHLD > >>> handler using signal.getsignal. > >> > >> We're also moving to python 2.6 (the change is really Debian 5 to > >> Debian 6). > >> Should it would work in 2.6? > > > > I think so. > >> > >>> What sort of things do your signal handlers do? > >> > >> IIRC, the main thing is to shut down the web server (cherrypy) we're > >> running > >> in parallel with twisted. We also have some disk-caching for stateful > >> signals which needs to ensure the cache file is up-to-date. > > > > For shutdown-type things, reactor.addSystemEventTrigger(phase, > > 'shutdown', f) might be better than getting into signal handlers (where > > phase is 'before', 'during', or 'after'). > > > There's already a system event trigger already hooked up to the reactor: > your main service's stopService call. If your cherrypy webserver is wrapped > up in an IService implementation in the service hierarchy constructed in > your twistd plugin or tac file, you can just implement 'stopService' and not > do any manual registration with event triggers. This is really a better way > to go in general, as it's easier for other API consumers to deal with such > an object than using the global broadcasting mechanism in the reactor. > > If you do want to manually add your own system event trigger, in most > interesting cases you'll need to use the 'before' phase. During 'before', > Deferreds returned by event triggers are respected (i.e. the reactor keeps > running as long as they haven't fired). If you schedule one for 'during' or > 'after', the event trigger really needs to do all of its work and complete > it immediately (i.e. before returning). > > > _______________________________________________ > Twisted-Python mailing list > Twisted-Python@twistedmatrix.com > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python > -- Jason Rennie Research Scientist, ITA Software 617-714-2645 http://www.itasoftware.com/
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