Skip site navigation (1)Skip section navigation (2)
Date:      Fri, 1 Dec 2000 18:01:04 -0800 (PST)
From:      Matthew Jacob <mjacob@feral.com>
To:        Andrew Gallatin <gallatin@cs.duke.edu>
Cc:        dg@root.com, Bosko Milekic <bmilekic@technokratis.com>, "Kenneth D. Merry" <ken@kdm.org>, arch@FreeBSD.ORG, alfred@FreeBSD.ORG
Subject:   Re: zero copy code review 
Message-ID:  <Pine.BSF.4.21.0012011758110.46782-100000@beppo.feral.com>
In-Reply-To: <14888.22179.833528.247128@grasshopper.cs.duke.edu>

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

> 
> 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.

We used to kill off shell pipes by spraying Sparc-1s as a test. This was
another reason (at the time) that SunOS (4.2based with 4.3 changes- pipes were
implemented with mbufs) was considered eligible to be replaced with SVr4.

-matt




To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-arch" in the body of the message




Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.4.21.0012011758110.46782-100000>