Allowing condition-notify call from non-elisp threads would solve the
problem as well.

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=42028

On Sat, Oct 31, 2020 at 9:46 AM Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Zhu Zihao <all_but_last@163.com>
> > Date: Sat, 31 Oct 2020 11:18:43 +0800
> > Cc: emacs-devel@gnu.org
> >
> > What about callbacks? You can pass a Lisp closure to module and call the
> > closure from module.
>
> How will this work, if the callback is called asynchronously?  The
> Lisp interpreter cannot be reentered.
>
> I think the method described by Stefan is the only sane path towards
> solving these situations.  It uses the infrastructure Emacs itself
> uses for asynchronous interactions.
>
>