Re: Concurrency via isolated process/thread

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: Ihor Radchenko <yantar92@posteo.net>,  emacs-devel@gnu.org
> Date: Sat, 08 Jul 2023 08:51:48 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Programs that use async threads avoid global variables like the
> > plague.  Emacs is full of them.
> 
> That's not true.  Look at any modern Unix kernel, and their detailed
> locking around traditional Unix data structures, such as allproc, the
> run queue, the vnode cache, and et cetera.

I said "programs", not "OSes".

It _is_ possible to have threads with global variables, but that
requires locking, which punishes performance.  We even do that in
Emacs, with Lisp threads.  I thought this discussion was about less
painful implementations.