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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: "Asynchronous Requests from Emacs Dynamic Modules"
Date: Sat, 31 Oct 2020 11:13:45 +0200
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 (message from yyoncho on Sat, 31 Oct 2020 10:02:41 +0200)
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> From: yyoncho <yyoncho@gmail.com>
> Date: Sat, 31 Oct 2020 10:02:41 +0200
> Cc: Zhu Zihao <all_but_last@163.com>, ak@akirakyle.com, 
> 	emacs-devel <emacs-devel@gnu.org>
> 
> Allowing condition-notify call from non-elisp threads would solve the problem as well. 

I don't see how that could be possible without redesigning the entire
Lisp threads machinery.

In general, no part of the Lisp interpreter -- and that includes the
Lisp thread related functions -- can ever safely run from an async
non-Lisp thread.