Skip site navigation (1)Skip section navigation (2)
Date:      Wed, 21 Dec 2011 10:41:33 -0700
From:      Warner Losh <imp@bsdimp.com>
To:        =?iso-8859-1?Q?Dag-Erling_Sm=F8rgrav?= <des@des.no>
Cc:        threads@freebsd.org, Poul-Henning Kamp <phk@phk.freebsd.dk>, freebsd-arch@freebsd.org
Subject:   Re: [Patch] C1X threading support
Message-ID:  <3ECEEFA0-6542-46CE-86D5-8A4D8226C81D@bsdimp.com>
In-Reply-To: <868vm6t0np.fsf@ds4.des.no>
References:  <58923.1324292241@critter.freebsd.dk> <AC4BCD04-6555-4AD1-BBCD-3C706852ECCF@bsdimp.com> <4EEF765D.4090300@zedat.fu-berlin.de> <868vm6t0np.fsf@ds4.des.no>

next in thread | previous in thread | raw e-mail | index | archive | help

On Dec 21, 2011, at 8:16 AM, Dag-Erling Sm=F8rgrav wrote:

> "O. Hartmann" <ohartman@zedat.fu-berlin.de> writes:
>> How is the other BSD sibbling, NetBSD, dealing with such things? =
NetBSD
>> is supposed to run on a trmendous variety of hardware, even a mixture =
of
>> bigendian and littleenddian and I'm quite sure they must have =
overcome
>> this probleme anyway.
>=20
> The same way FreeBSD does: where ordering matters, use explicit
> conversions when reading and writing.  The conversion functions / =
macros
> are defined in such a manner that unnecessary conversions (e.g. host =
to
> little-endian on a little-endian system) do not generate any code at
> all.  The only downside is that you can't directly compare variables
> unless you're certain that they're both in host order.

And it is difficult for automated tools to help you know if you are =
"sure" or not.

Warner




Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?3ECEEFA0-6542-46CE-86D5-8A4D8226C81D>