Re: Questions about throw-on-input

[yyoncho <yyoncho@gmail.com>]

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Hi Eli,

Threads seem to the correct solution for the problem I am trying to solve.
Thank you for your help.

Thanks,
Ivan

On Fri, May 8, 2020 at 2:45 PM Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Ivan Yonchovski <yyoncho@gmail.com>
> > Cc: emacs-devel@gnu.org
> > Date: Fri, 08 May 2020 14:23:34 +0300
> >
> > (defun process-events ()
> >   (when (input-pending-p)
> >     (run-with-timer 0.01 nil (lambda () (throw 'exit nil)))
> >     (recursive-edit)))
> >
> > (dotimes (counter 1000)
> >   (sleep-for 0.01) ;; simulate execution of N tasks
> >   (message "%s" counter)
> >   (process-events))
> >
> > This code is able to handle C-n but obviously it will break if someone
> > starts another recursive-edit or for complex keybindings, e. g. `C-x b`.
>
> I think you will indeed find that this is very fragile.
>
> > Are you aware of something doing something similar? Do you think it
> > makes sense if you want to process something slow on the background
> > without blocking emacs?
>
> I think this is why we added threads to Emacs.  Why not try doing this
> in a thread?
>
> > > AFAIU, such facilities need to have a separate event loop that
> > > generally runs in a separate thread.
> >
> > In the C# case it all happens on the UI thread. DoEvents means handle
> > mouse clicks, repaint controls, etc(the stuff from the event loop) and
> > then continue with current execution.
>
> When display is as intimately connected to the global state as it is
> in Emacs, I don't think such separation can fly.
>

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