[Buildbot-devel] deferreds from polling change source

[Jorge Gonzalez]

Thanks Tom. This is what I was looking for:
twisted.internet.threads.deferToThread<http://twistedmatrix.com/documents/13.0.0/api/twisted.internet.threads.deferToThread.html>

Jorge


On Thu, Jun 27, 2013 at 4:14 PM, Tom Prince <tom.prince at ualberta.net> wrote:

> Jorge Gonzalez <gjorge at google.com> writes:
> >   def poll(self):
> >     defered_poll = defer.Deferred()
> >     defered_poll.addCallback(lambda _: self.DoTheActualPoll())
> >     defered_poll.callback(None)
> >     return defered_poll
>
> `.doTheActualPoll` will just be called when `.callback` is
> called. Deferreds don't magically make something asynchronous, they are
> just a way of organizing callbacks.
>
> The right way to do this is to change `.doTheActualPoll` to be
> asynchronous. How to do this will depend on what is doing. Anything else
> will cause everything to freeze while it is running.
>
>   Tom
>
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