Date: Tue, 19 Aug 2008 11:26:07 -0400 From: Ed Maste <emaste@freebsd.org> To: Julian Elischer <julian@elischer.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Acquiring a mtx after an sx lock Message-ID: <20080819152607.GA44331@sandvine.com> In-Reply-To: <48A9C1B0.5010805@elischer.org> References: <bc2d970808180814ue926d43s7966b36ffa3c9699@mail.gmail.com> <200808181754.18812.max@love2party.net> <bc2d970808180902h1ded9bcbp494d276ede0eeed@mail.gmail.com> <20080818162411.GA77460@sandvine.com> <48A9BFED.604@elischer.org> <48A9C1B0.5010805@elischer.org>
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On Mon, Aug 18, 2008 at 11:38:40AM -0700, Julian Elischer wrote: > >Ed Maste wrote: > >>Ahh, it seems ups' commit of rmlocks changed the "You have: sx_lock, > >>You want: Slp_mtx" case from no to ok (in r173444). > > Ignore me.. I was reading the table backwards.. of course if you have > an sx you can still take out a mutex, but not visa versa. Yep, and ups' r173444 change didn't affect this at all, it just corrected the table. If I don't hear otherwise I'll merge the changes to the table to 7 sometime soon: You have: You want: Spin_mtx Slp_mtx sx_lock rw_lock sleep - SPIN mutex ok no no no no-3 + SPIN mutex ok-1 no no no no-3 Sleep mutex ok ok-1 no ok no-3 - sx_lock ok no ok-2 no ok-4 + sx_lock ok ok ok-2 ok ok-4 rw_lock ok ok no ok-2 no-3 Have SPIN / want SPIN adds the "Recursion is defined per lock" footnote. Have sx / want Slp & have sx / want rw change from no to ok. - Ed
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