Re: GC + Java finalization

[Jonas Hahnfeld via "Developers list for Guile, the GNU extensibility library" <guile-devel@gnu.org>]

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Am Freitag, dem 19.11.2021 um 13:35 +0000 schrieb Maxime Devos:
> Jonas Hahnfeld schreef op vr 19-11-2021 om 14:32 [+0100]:
> > > You coud simply ...
> > > 
> > > 
> > > > -      scm_gc_free (rx, sizeof(regex_t), "regex");
> > > > +      free (rx);
> > > 
> > > drop the scm_gc_free AFAIK.
> > 
> > No, I cannot as explained in the patch summary: If we use
> > scm_gc_free
> > in a free function of a Smob, this relies on Java finalization
> > because
> > the memory must not be reclaimed in the same cycle.
> 
> The suggestion was to remove scm_gc_free, and not introduce free.
> I.e., don't free rx manually at all, let boehmgc decide:
> 
>  regex_free (SCM obj)
>  {
>    regfree (SCM_RGX (obj));
> -  scm_gc_free (SCM_RGX (obj), sizeof(regex_t), "regex");
>    return 0;
>  }

This is dangerous because we still pass the memory to regfree, so it
must not be freed before.

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