bug#24849: Is Emacs put in idle mode when window is not focused?

[Eli Zaretskii <eliz@gnu.org>]

> From: Johan Andersson <johan.andersson@burtcorp.com>
> Date: Tue, 1 Nov 2016 20:48:59 +0100
> Cc: 24849@debbugs.gnu.org
> 
> (let* ((default-directory "/tmp")
> (process (start-process "server" nil "python" "-m" "SimpleHTTPServer" "8000")))
> (set-process-filter
> process
> (lambda (_ output)
> ;; ...
> )))
> 
> What happens in practice is that, when I get to work, I select the services I need and start them (unless
> Emacs was killed, they are already started). Sometimes I use Emacs quite frequently and then this is not so
> much of an issue because Emacs does not have time to idle. But when I don't use Emacs for a while, it will
> hang waiting for the response from the service (because Emacs is idle).

So you are saying that the service, which is a sub-process of Emacs,
produces some output, but Emacs doesn't read that output timely enough
because it's idle?  That's not possible, I think: when Emacs is idle,
it is most of the time stuck inside a call to 'pselect', which should
return immediately when some input arrived from a sub-process.

So I guess I still don't understand something in your setup.  But
what?