Re: Some experience with the igc branch

[Eli Zaretskii]

> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Cc: pipcet@protonmail.com,  ofv@wanadoo.es,  emacs-devel@gnu.org,
>   eller.helmut@gmail.com,  acorallo@gnu.org
> Date: Wed, 25 Dec 2024 14:08:34 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > So why are those unsafe?  Because they access Lisp objects, or for
> > some other reason?
> 
> What do you mean with unsafe? We are accessing an object's memory. That
> memory may potentially be protected by a barrier.

That's what I meant by "unsafe".  I'm still wrapping my head around
this stuff, so apologies if I ask stupid questions.  Here's another
one: why accessing the same object's memory that may be protected by a
barrier OK from the main (a.k.a. "Lisp") thread, when MPS could have
meanwhile started GC asynchronously?  IOW, how is this "normal" access
to Lisp objects different from access from a signal handler?