linux-kernel - Re: [RFC patch 4/7] futex: Add support for attached futexes

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Message-ID: <alpine.DEB.2.11.1604031155580.3978@nanos>
Date:	Sun, 3 Apr 2016 11:57:51 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andy Lutomirski <luto@...nel.org>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Darren Hart <darren@...art.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Michael Kerrisk <mtk.manpages@...glemail.com>,
	Davidlohr Bueso <dave@...olabs.net>, Chris Mason <clm@...com>,
	Carlos O'Donell <carlos@...hat.com>,
	Torvald Riegel <triegel@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: [RFC patch 4/7] futex: Add support for attached futexes

On Sat, 2 Apr 2016, Andy Lutomirski wrote:

> On 04/02/2016 04:09 AM, Thomas Gleixner wrote:
> [omitted due to some Thunderbird bug, sigh]
> 
> What happens if you mix attached an non-attached ops on the same futex?

Not much. You might get an error code, sleep forever or the call will just
result in a NOP wasting cpu cycles. That's the same when you mix
shared/private operations on the same futex.

Thanks,

	tglx