linux-kernel - Re: implementing Futex

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Message-ID: <4A855EE5.9010105@lumino.de>
Date:	Fri, 14 Aug 2009 14:56:05 +0200
From:	Michael Schnell <mschnell@...ino.de>
To:	Arnd Bergmann <arnd@...db.de>
CC:	linux-kernel@...r.kernel.org,
	Mike Frysinger <vapier.adi@...il.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Jakub Jelinek <jakub@...hat.com>,
	Thomas Chou <thomas@...ron.com.tw>
Subject: Re: implementing Futex

Arnd Bergmann wrote:
> The man page says that the last parameter is ignored for op=FUTEX_WAKE,
> which is correct. The code that you were looking at however is for
> of=FUTEX_WAKE_OP, which is not documented as of manpages-3.22.
> 
> It was added by Jakub back in 2005, but if he wrote a documentation
> for it, it never went into the man pages package. On a similar
> note, Ingo also added other futex operations that are not documented
> yet.
> 

Thus in any documented software, the quite complex stuff in
"futex_atomic_op_inuser", which is provided in several different
"futex.h" files for all those architectures *never* is used ?

Weired !

Is there any viable use for this ?

Would it not be appropriate either to do a documentation or to remove it ?

-Michael
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