linux-kernel - Re: Revised futex(2) man page for review

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Message-ID: <20150427203705.GE29351@xo-6d-61-c0.localdomain>
Date:	Mon, 27 Apr 2015 22:37:05 +0200
From:	Pavel Machek <pavel@....cz>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Darren Hart <dvhart@...ux.intel.com>,
	Carlos O'Donell <carlos@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, Jakub Jelinek <jakub@...hat.com>,
	"linux-man@...r.kernel.org" <linux-man@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	Arnd Bergmann <arnd@...db.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux API <linux-api@...r.kernel.org>,
	Torvald Riegel <triegel@...hat.com>,
	Roland McGrath <roland@...k.frob.com>,
	Darren Hart <dvhart@...radead.org>,
	Anton Blanchard <anton@...ba.org>,
	Eric Dumazet <edumazet@...gle.com>,
	bill o gallmeister <bgallmeister@...il.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Daniel Wagner <wagi@...om.org>, Rich Felker <dalias@...c.org>,
	Andy Lutomirski <luto@...capital.net>,
	bert hubert <bert.hubert@...herlabs.nl>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Heinrich Schuchardt <xypron.glpk@....de>
Subject: Re: Revised futex(2) man page for review

Hi!

>               The FUTEX_WAIT_OP operation is equivalent to execute the follow???
>               ing  code  atomically  and totally ordered with respect to other
>               futex operations on any of the two supplied futex words:

"to executing"?

>               The  operation  and  comparison  that  are  to  be performed are
>               encoded in the bits of  the  argument  val3.   Pictorially,  the
>               encoding is:
> 
>                       +---+---+-----------+-----------+
>                       |op |cmp|   oparg   |  cmparg   |
>                       +---+---+-----------+-----------+
>                         4   4       12          12    <== # of bits
> 

:-)

> RETURN VALUE
>        In the event of an error, all operations return -1  and  set  errno  to
>        indicate  the  cause of the error.  The return value on success depends
>        on the operation, as described in the following list:

Did you say (at the begining) that there is no glibc wrapper?

>        EINVAL The operation in futex_op is one of those that employs  a  time???
>               out,  but  the supplied timeout argument was invalid (tv_sec was
>               less than zero, or tv_nsec was not less than 1000,000,000).

1,000...?

> NOTES
>        Glibc does not provide a wrapper for this system call;  call  it  using
>        syscall(2).

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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