Date: Mon, 28 Jun 1999 12:47:25 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: John Hay <jhay@mikom.csir.co.za> Cc: peter@netplex.com.au (Peter Wemm), alc@cs.rice.edu (Alan Cox), tlambert@primenet.com (Terry Lambert), bakul@torrentnet.com (Bakul Shah), julian@whistle.com, freebsd-smp@FreeBSD.ORG Subject: Re: high-efficiency SMP locks - submission for review Message-ID: <199906281947.MAA24287@apollo.backplane.com> References: <199906281926.VAA16677@zibbi.mikom.csir.co.za>
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:> The 386, I doubt has it. There have been a couple of suggestions for ending
:> the support for the 386 as it will simplify some ugly code for emulating
:> kernel-mode write faults etc, but it's never happened. Apparently the
:> 386 is common in some areas still.
:
:The 386 is still used a lot in embeded systems. (With FreeBSD running on
:some of them. :-)
:
:John
:--
:John Hay -- John.Hay@mikom.csir.co.za
Since 386's are UP systems, I think it would be fairly easy to implement
the UP version of the compare-and-exchange primitive trivially with an
spl wrapper. We should be able to freely use use the cmpxchg instruction
on SMP systems.
-Matt
Matthew Dillon
<dillon@backplane.com>
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