Date: Mon, 04 Dec 2000 14:50:07 -0800 From: Mike Smith <msmith@freebsd.org> To: Brian Somers <brian@Awfulhak.org> Cc: Julian Elischer <julian@elischer.org>, brian@FreeBSD.org, archie@FreeBSD.org, phk@FreeBSD.org, smp@FreeBSD.org Subject: Re: Netgraph and SMP Message-ID: <200012042250.eB4Mo7F01738@mass.osd.bsdi.com> In-Reply-To: Your message of "Mon, 04 Dec 2000 22:31:36 GMT." <200012042231.eB4MVaD93192@hak.lan.Awfulhak.org>
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> > The simplest structure for this is a shared/exclusive lock
> > that supports intention; Terry would have ranted about this. (He would
> > have called it a SIX-lock, I think).
> [.....]
> > This may sound simplistic, but given that you don't necessarily make
> > changes to Netgraph very often, this is quite likely more than adequate
> > for now.
>
> Nice, I never realised there were shared/exclusive locks available.
> I think netgraph nodes would also need to have a ``modevent'' that
> fails MOD_UNLOAD events if any locks are outstanding.
Er, no, you just have to acquire the exclusive lock in the MOD_UNLOAD
handler.
As for the actual availibility of SIX-style locks; I'm fairly sure you
can do this with the lockmgr.
--
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
V I C T O R Y N O T V E N G E A N C E
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