From owner-freebsd-hackers  Mon May 11 18:16:32 1998
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To: "Justin T. Gibbs" <gibbs@plutotech.com>
Cc: Julian Assange <proff@iq.org>, gibbs@FreeBSD.ORG, hackers@FreeBSD.ORG,
        dyson@FreeBSD.ORG, mrg@eterna.com.au, mckusick@mckusick.com
Subject: Re: more queue.h brokenness 
Reply-To: Jason Thorpe <thorpej@nas.nasa.gov>
From: Jason Thorpe <thorpej@nas.nasa.gov>
Date: Mon, 11 May 1998 18:05:34 -0700
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On Mon, 11 May 1998 18:21:46 -0600 
 "Justin T. Gibbs" <gibbs@plutotech.com> wrote:

 > For -stable?  Yes, it was me that brought currents sys/queue.h in.  The
 > changes that were made to sys/queue.h in this area, however, were 
 > performed by Kirk and are used by the soft update code.

[ . . . ]

 > It's used in the soft update code as well as in latest version of the CAM
 > aic7xxx sequencer compiler.  Supporting CAM was the main reason I brought
 > the code in.

Given how the TAILQ_PREV() and TAILQ_LAST() macros work (when I realized
how they work, I had to stop, get up, and go get another cup of coffee
to calm my nerves), I just have to ask:

	"Why no just use CIRCLEQ?"

I mean, that's what they're for, and they're not really that much more
expensive (only on insertion; an extra pointer indirection, and modify
two elements rather than one).

Jason R. Thorpe                                       thorpej@nas.nasa.gov
NASA Ames Research Center                            Home: +1 408 866 1912
NAS: M/S 258-5                                       Work: +1 650 604 0935
Moffett Field, CA 94035                             Pager: +1 650 428 6939

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