Re: Asynchronous DNS

[Eli Zaretskii]

> From: Alain Schneble <address@hidden>
> CC: Eli Zaretskii <address@hidden>, <address@hidden>
> Date: Sun, 14 Feb 2016 12:19:03 +0100
> 
> Lars Ingebrigtsen <address@hidden> writes:
> 
> > Alain Schneble <address@hidden> writes:
> >
> >> The following patch removes the separate dns_processes list in favour of
> >> reusing Vprocess_alist.  The latter list is now used to loop over all
> >> processes -- to check if pending DNS requests have completed.
> >>
> >> Do you agree whith this change?
> >
> > Well, it changes a test in the network loop that is basically a if (!
> > NILP (Qnil)) in 99.9999% (plus some nines) of the cases with code that
> > loops through all processes in the network loop all the time.
> 
> True.  Seems like I was too naive. I thought that these additional
> cycles were negligible (even though it's O(n)...).

We could traverse the list when Emacs is idle and maintain the result
in a cache variable.