linux-kernel - Re: FUTEX_CMP_REQUEUE

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Message-ID: <46455EB4.901@redhat.com>
Date:	Fri, 11 May 2007 23:29:08 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Pierre Peiffer <pierre.peiffer@...l.net>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>, Ingo Molnar <mingo@...e.hu>
Subject: Re: FUTEX_CMP_REQUEUE_PI is not quite there

Andrew Morton wrote:
> Well yup.  We're kind of waiting for someone to reply
> to http://lkml.org/lkml/2007/5/7/129

Seems to be the same or at least related.

On comment about my first mail: this is the correct code of condvars, 
despite what I wrote before.  I wasn't thinking clear.  The internal 
futex is a normal futex.  It is the job of the CMP_REQUEUE_PI call to 
figure this out, select the waiter with the highest priority, and boost 
the priority if necessary based on the targer futex which always is a PI 
futex.

-- 
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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