linux-kernel - Re: futex: Allow FUTEX_CLOCK_REALTIME with FUTEX

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Message-ID: <alpine.DEB.2.11.1606241151500.5839@nanos>
Date:	Fri, 24 Jun 2016 11:52:07 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
cc:	Darren Hart <dvhart@...radead.org>,
	Matthieu CASTET <matthieu.castet@...rot.com>,
	linux-kernel@...r.kernel.org, Darren Hart <dvhart@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	Eric Dumazet <dada1@...mosbay.com>
Subject: Re: futex: Allow FUTEX_CLOCK_REALTIME with FUTEX_WAIT op

On Fri, 24 Jun 2016, Michael Kerrisk (man-pages) wrote:
> By the way, I just realized something that wasn't initially obvious
> to me, and documented it in the futex(2) man page:
> 
>               Note:  for  FUTEX_WAIT,  timeout is interpreted as a
>               relative value.  This differs from other futex oper‐
>               ations,  where timeout is interpreted as an absolute
>               value.  To obtain the equivalent of FUTEX_WAIT  with
>               an  absolute  timeout, employ FUTEX_WAIT_BITSET with
>               val3 specified as FUTEX_BITSET_MATCH_ANY.
> 
> Okay?

Yes.