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From: presotto@pla...
Subject: Kernel question: i386 test-and-set problem
Date: Fri, 21 Jul 2000 09:15:44 -0400

I would have left the lock in if I could have figured out how to do
it and fix the other problems.  The main problem is that one side knows
p and the other side knows r.  If I have one lock, one side is going
to have to look at something not under a lock.  If I have two locks,
one in r and one in p, I can't figure out how to get them both to lock
in the same order.