From owner-freebsd-hackers@FreeBSD.ORG  Wed Aug 15 15:24:06 2007
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Date: Wed, 15 Aug 2007 17:24:00 +0200
From: Roman Divacky <rdivacky@freebsd.org>
To: Nex Mon <sugarfreemonkey@gmail.com>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: questions on nonsleepable lock
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On Wed, Aug 15, 2007 at 05:10:48PM +0800, Nex Mon wrote:
> thanks for your reply.
> 
> i didn't use WITNESS. it is disabled.
> 
> is their a list a list of which locks are sleepable and non-sleepable
> in FreeBSD6.2? is sleeping triggered by a call to "sleep", IO operation
> or a result of context switching by kernel?

all locks except sx and Giant are nonsleepable, sleeping can be triggered
by calling foo_sleep() and/or by calling a sleeping function (like io etc.)