From owner-freebsd-arch  Fri Dec  1 18: 6:23 2000
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To: mjacob@feral.com
Cc: Andrew Gallatin <gallatin@cs.duke.edu>,
	Bosko Milekic <bmilekic@technokratis.com>,
	"Kenneth D. Merry" <ken@kdm.org>, arch@FreeBSD.ORG,
	alfred@FreeBSD.ORG
Subject: Re: zero copy code review 
In-reply-to: Your message of "Fri, 01 Dec 2000 18:01:04 PST."
             <Pine.BSF.4.21.0012011758110.46782-100000@beppo.feral.com> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Fri, 01 Dec 2000 18:02:20 -0800
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>
>> 
>> David Greenman writes:
>>  >    Oops. The original assumption (and code that I wrote) was that M_WAIT
>>  > _cannot_ return a NULL pointer. This was changed in FreeBSD recently, and
>> 
>> Yes, that's always been my assumption too.  That's why I never noticed
>> it...
>
>IIRC, this has never been guaranteed. It's often unlikely that a request can't
>be satisfied after a sleep with the current code.

   FreeBSD blocked indefinitly and never returned a NULL pointer.

-DG

David Greenman
Co-founder, The FreeBSD Project - http://www.freebsd.org
President, TeraSolutions, Inc. - http://www.terasolutions.com
Pave the road of life with opportunities.


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