From: Marius Vollmer <mvo@zagadka.de>
Cc: jantien@xs4all.nl, guile-devel@gnu.org
Subject: Re: scm_gc_unprotect during GC
Date: Tue, 21 Sep 2004 23:23:54 +0200 [thread overview]
Message-ID: <87k6untixh.fsf@zagadka.ping.de> (raw)
In-Reply-To: <16706.21406.130861.89431@byrd.xs4all.nl> (Han-Wen Nienhuys's message of "Sat, 11 Sep 2004 03:23:42 +0200")
Han-Wen Nienhuys <hanwen@xs4all.nl> writes:
> A short term solution is to make sure that LilyPond never does
> scm_gc_unprotect_object() from smobbed destructor. However, I feel
> that this is a kludge.
>
> Either scm_gc_unprotect_object is callable during sweep, or this is
> forbidden. At present, GUILE does not print a warning, but barfs in an
> unrelated location.
Yes, that's unfortunate. Almost anything is forbidden during sweep,
and we need to document that more clearly.
I'd say that a smob free function should not call
scm_gc_unprotect_object, or any other function that accesses the heap.
The heap might be in an inconsistent state, etc. We probably should
list all functions that are callable, starting with just scm_gc_free.
Why do you need to call scm_gc_unprotect_object from your smob free
function? To release a SCM value that was in use by the smob? The
usual way to do that is to mark that value in the smob mark function.
--
GPG: D5D4E405 - 2F9B BCCC 8527 692A 04E3 331E FAF8 226A D5D4 E405
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next prev parent reply other threads:[~2004-09-21 21:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-11 1:23 scm_gc_unprotect during GC Han-Wen Nienhuys
2004-09-21 21:23 ` Marius Vollmer [this message]
2004-09-24 9:24 ` Han-Wen Nienhuys
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