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From: Kip Macy <kmacy@fsmware.com>
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Cc: Divacky Roman <xdivac02@stud.fit.vutbr.cz>,
	Perforce Change Reviews <perforce@freebsd.org>,
	Robert Watson <rwatson@freebsd.org>, Roman Divacky <rdivacky@freebsd.org>
Subject: Re: PERFORCE change 103633 for review
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> Yes, but my assumption is that it lets the easy cases just run in userland and
> only goes into the kernel for a hard case, so you need to use atomic ops such
> as casuptr().

Correct, umtx post-dates and is meant to compete with futex.

          -Kip