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

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Date:	Mon, 28 Sep 2009 12:58:52 +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:
> Mathieu Desnoyers wrote:
>> The mutex code (and usual futex users) use futex to implement mutual
>> exclusion.  My goal is to send a wakeup signal to a thread waiting for
>> work to perform when adding such work. But without any mutual exclusion.
> 
> Why is that different ?
> 
> if you use a normal FUTEX like pthread_mutex_...() and have the thread
> block right at the start (by blocking the *UTEX before creating the
> thread). Now you can wake the thread by unblocking the *UTEX.
> 
> -Michael
> 
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