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From: Lynn Winebarger <owinebar@free-expression.org>
Cc: guile-devel@gnu.org
Subject: Re: new GC code merged
Date: Sat, 17 Aug 2002 20:31:23 -0500	[thread overview]
Message-ID: <02081720312303.19624@locke.free-expression.org> (raw)
In-Reply-To: <15710.60437.890421.939332@blauw.xs4all.nl>

On Saturday 17 August 2002 19:36, Han-Wen Nienhuys wrote:
> owinebar@free-expression.org writes:
> 
> >        Excuse my ignorance.  The notes in tag.h indicate that the
> > least significant bit of the 2nd word of a cell is used for marking.
> > I was reading gc.h and it appears the mark bits are stored
> > separately.  On the other hand, I looked at a copy of guile from
> > before your changes and it might also have used separate mark
> > bitvectors.  So is that lsb of the second word of a cell actually
> > free for some other use besides marking?
> 
> This has been changed shortly after 1.4 was released. It's free for
> use, but since all the tags live in the first word of a cell, I don't
> readily see a use for it (but I don't know much about implementations
> for LISP like languages)
> 
      You just never know when an extra bit might come in handy.  Now that 
I look again, the comments don't say that last bit is used for gc (as they did 
a few months ago).

Lynn


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      reply	other threads:[~2002-08-18  1:31 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-08-04  0:27 new GC code merged Han-Wen
2002-08-05 18:18 ` Marius Vollmer
2002-08-17  5:30 ` Lynn Winebarger
2002-08-18  0:36   ` Han-Wen Nienhuys
2002-08-18  1:31     ` Lynn Winebarger [this message]

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