linux-kernel - Re: [PATCH] futex: add FUTEX_SET

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Message-ID: <4B033C2B.5000504@us.ibm.com>
Date:	Tue, 17 Nov 2009 16:13:31 -0800
From:	Darren Hart <dvhltc@...ibm.com>
To:	Michel Lespinasse <walken@...gle.com>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] futex: add FUTEX_SET_WAIT operation

Michel Lespinasse wrote:
> Hi,
> 
> I would like to propose adding a new FUTEX_SET_WAIT operation to the futex
> code, as per the following patch against 2.6.32-rc7

If we go ahead with this, I'd like to adapt FUTEX_WAIT_REQUEUE_PI to use 
this as well, as it faces all the same races related to the calling task 
getting to sleep in the kernel before a wake call (FUTEX_CMP_REQUEUE_PI 
in this case) as futex_wait does. FUTEX_SET_WAIT_REQUEUE_PI is 
ridiculously long... but it is what it is I guess :-)

-- 
Darren "not-as-brave-as-peterz (short quote for Linus)" Hart
IBM Linux Technology Center
Real-Time Linux Team
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