From owner-freebsd-hackers@FreeBSD.ORG  Sun Jan 15 11:36:29 2006
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From: Robert Watson <rwatson@FreeBSD.org>
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To: prime <guomingyan@gmail.com>
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Cc: freebsd-hackers@freebsd.org, Tiffany Snyder <tiffany.snyder@gmail.com>
Subject: Re: How priority propagation works on read/write lock?
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On Sun, 15 Jan 2006, prime wrote:

> On 1/15/06, Tiffany Snyder <tiffany.snyder@gmail.com> wrote:
>>
>> Does FreeBSD support rwlocks?
...
> FreeBSD supports sx now,see sx(9).sx has the same semanteme
> as rwlock.

While semantically they are very simila, John Baldwin has a work-in-progress 
implementation of rwlock's in Perforce.  Given the progress he appears to be 
making, I imagine we'll see it in CVS within a week or two.

Robert N M Watson