Re: Collecting markers with MPS

[Eli Zaretskii]

> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Cc: Helmut Eller <eller.helmut@gmail.com>,  emacs-devel@gnu.org
> Date: Wed, 24 Apr 2024 12:58:23 +0200
> 
> Gerd Möllmann <gerd.moellmann@gmail.com> writes:
> 
> > Eli Zaretskii <eliz@gnu.org> writes:
> >
> >> Can't the new GC tell us which markers are unreferenced?
> >
> > I'm afraid no. At least I haven't seen it mentioned in the docs.

Does this mean MPS doesn't allow a user-defined function to be called
when some object is found unreferenced?  I'd assume such callbacks are
available, since some objects need custom code to dispose of.

> Err, and the marker would be references from the list anyway...

Maybe I don't understand the problem we are talking about.  Is this
about unchain_dead_markers, which is called from sweep_buffers?  If
so, how are non-dead markers currently identified during the mark
phase?