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

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Message-ID: <2649c14b-bee1-f94c-4e59-769a096af391@gmail.com>
Date:	Fri, 24 Jun 2016 12:00:05 +0200
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	mtk.manpages@...il.com, 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 06/24/2016 11:52 AM, Thomas Gleixner wrote:
> 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.

Thanks, Thomas.

Cheers,

Michael



-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/