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Re: Dynamic loading progress

From: Stefan Monnier
Subject: Re: Dynamic loading progress
Date: Wed, 09 Jul 2014 18:18:02 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux)

> It should work but I've ran into a strange problem: the doc field is
> set correctly in step a) but the field becomes either an invalid lisp
> object or garbage at step b).
> It suspect it has to do with garbage collecting since I have not done
> anything special to protect the doc field. I'm not sure how to
> proceed.

Right.  You need to tell the GC to trace this new field.

Look at the mark_object function in alloc.c.

You could change its handling of PVEC_SUBR such that it calls itself
recursively on the `doc' field and then make sure the VECTOR_MARKED_P bit
gets reset to false in gc_sweep.

Or maybe force those `doc' references to be kept alive by adding
globally reachable references to them (e.g. have a global list of all
the cons cells you ever added to such a `doc' field, and then
`staticpro' that list).


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