Re: Emacs design and architecture. How about copy-on-write?

[Eli Zaretskii]

> From: Emanuel Berg <incal@dataswamp.org>
> Date: Tue, 19 Sep 2023 21:38:39 +0200
> 
> Eli Zaretskii wrote:
> 
> > If we need to lock 99.99% of Emacs "single" variables, it is
> > easier to lock everything. Faster, too.
> 
> Why do we need to do that?
> 
> For one thread, one write operation, and one variable, only
> that variable has to be locked?
> 
> (operate-on var1) ; here we need a lock on var1
> (operate-on var2) ; etc

We don't have 'operate' in Emacs, but we do have setq, setf, and
others.  Where do you locak and where do you unlock in that case?

Just try to write a simplest Lisp program, and you will see the
problem.