Date: Tue, 06 Feb 2001 09:06:12 -0800 From: Peter Wemm <peter@netplex.com.au> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/dev/awi awi.c src/sys/dev/ed if_ed.c src/sys/dev/fe if_fe.c src/sys/dev/ie if_ie.c src/sys/dev/lnc if_lnc.c src/sys/dev/pdq pdq_ifsubr.c src/sys/dev/ray if_ray.c src/sys/dev/sn if_sn.c src/sys/dev/snc dp83932.c src/sys/dev/usb ... Message-ID: <200102061706.f16H6Ct48905@mobile.wemm.org> In-Reply-To: <35414.981478030@critter>
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Poul-Henning Kamp wrote:
> In message <200102061643.LAA32336@khavrinen.lcs.mit.edu>, Garrett Wollman wri
tes:
> ><<On Tue, 06 Feb 2001 08:41:00 -0800, Peter Wemm <peter@netplex.com.au> said
:
> >
> >> I thought LIST was doubly linked, which means we should be able to have a
> >> LIST_PREV(), right? SLIST is singly linked as is STAILQ.
> >
> >There is a LIST_PREV macro, but in order to traverse the entire list
> >backwards, one must first get to the very end, which requires a loop
> >in LIST and a single dereference in TAILQ.
>
> There is no LIST_PREV macro in any versions of the file I know off.
>
> See previous email to Peter why making one would be awkward.
Depends on what you want to do. Traversing a list from the end backwards
is not the only reason for having it. NFS wants it, for example.
Cheers,
-Peter
--
Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au
"All of this is for nothing if we don't go to the stars" - JMS/B5
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