Date: Mon, 27 Mar 2000 12:08:33 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Daniel Eischen <eischen@vigrid.com> Cc: Nate Williams <nate@yogotech.com>, nms@otdel-1.org, freebsd-current@FreeBSD.ORG Subject: Re: Is there spinlocks/semaphores available for drivers? Message-ID: <200003272008.MAA42799@apollo.backplane.com> References: <Pine.SUN.3.91.1000327142313.16202A@pcnet1.pcnet.com>
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:
:There's a paper that describes how Solaris transitioned from spl()s
:to mutexes. ISTR they created one mutex for each splxxx. I'll have
:to find this and re-read it.
:
:--
:Dan Eischen
I think we're using a slightly different mechanism... our spl*()'s
are actually interrupt bit masks. That is, any single spl*() call
may mask several interrupt sources. Turning a mask with five or six
bits set in it into a set of mutexes is a very expensive proposition.
-Matt
Matthew Dillon
<dillon@backplane.com>
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