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Proposal for a new mechanism for delayed stuff

From: Lars Ingebrigtsen
Subject: Proposal for a new mechanism for delayed stuff
Date: Tue, 25 Dec 2012 14:20:31 +0100
User-agent: Gnus/5.130006 (Ma Gnus v0.6) Emacs/24.3.50 (gnu/linux)

Gnus does a lot of stuff that it doesn't really know how long it'll take
to do.  For instance, connecting to a mail server, and rendering
complex HTML.

If Gnus were to output "Connecting to foo", "sending retrieval
commands", "waiting for foo to finish outputting" (which are usually
done asynchronously, intermingled between many servers), Gnus would spew
an inordinate number of messages.

And sometimes the user should know what's taking so long, so that the
user can decide what to do about it.

So the ideal would be if we could say "display a message if things take
too long".

The idea I had yesterday was to make this totally general:

  (1.5 (message "This is sure taking a lot of time..."))
  (10 (message "This is sure taking forever!")))

A la condition-case and stuff, although here we have forms that are
run if the main form takes too long.  So after 1.5 seconds we trigger
the first, and after 10 we trigger the second.

And perhaps it would also be possible to have a special thing in the
timeout forms that would conclude the entire main form?  Like `return'
or something.

So it's like `with-timeout', only that it doesn't end executing the
body.  And it would hopefully be possible to implement it such a way
that a looping body form would also be "pre-emptible".  

(domestic pets only, the antidote for overdose, milk.)
  http://lars.ingebrigtsen.no  *  Lars Magne Ingebrigtsen

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