Re: User interaction from multiple threads

["Elias Mårtenson" <lokedhs@gmail.com>]

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On Fri, 24 Aug 2018 at 19:46, Michael Albinus <michael.albinus@gmx.de>
wrote:

> Eli Zaretskii <eliz@gnu.org> writes:
>
> > The idea expressed by several people is that once you start
> > interacting with some thread's prompt, the other threads are locked
> > out of interaction, until the interacting thread is done with the
> > series of prompts that allow it to go on with its business.
>
> Yes. The simplest locking mechanism I could imagine is a mutex locking
> such interactions. This must be used for every
> echo-a-prompt-and-read-the-answer interaction by default (we shall
> determine all low-level cases). And it shall be a predefined, documented
> mutex, like `interaction-mutex'.
>

May I propose that the murex be hidden behind a function and a macro? The
purpose of this would be to allow for the function to adviced by libraries
that want to do something special. Something like this:

(defmacro with-prompt-interaction (&body body)
  (call-with-prompt-interaction `(lambda ()  ,@body)))

(defun call-with-prompt-interaction (fn)
  (with-mutex (interaction-mutex)
    (funcall fn)))

This would allow advices to be applied to the call-with-prompt-interaction
function.

Regards,
Elias

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