linux-kernel - Re: [RFC] Userspace RCU: (ab)using futexes to save cpu cycles and energy

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Message-ID: <4AC097A4.9070903@lumino.de>
Date:	Mon, 28 Sep 2009 13:01:56 +0200
From:	Michael Schnell <mschnell@...ino.de>
To:	linux-kernel@...r.kernel.org
Subject: Re: [RFC] Userspace RCU: (ab)using futexes to save cpu cycles and
 energy

Michael Schnell wrote:
> Why is that different ?

It might be that (different from a sema), a FUTEX can only be unlocked
by the process that locked it.

But then why should FUTEX offer advantages over sema, if in that
application the FUTEX is supposed to block with a system call, anyway ?

-Michael
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