From: Michael Schnell <mschnell@lumino.de>
To: unlisted-recipients:; (no To-header on input)
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
nios2-dev <nios2-dev@sopc.et.ntust.edu.tw>
Subject: Re: atomic RAM ?
Date: Fri, 09 Apr 2010 12:54:26 +0200 [thread overview]
Message-ID: <4BBF0762.8040505@lumino.de> (raw)
In-Reply-To: <201004081615.01151.arnd@arndb.de>
On 04/08/2010 04:15 PM, Arnd Bergmann wrote:
> /* returns one if we got the lock, zero if someone else holds it */
> bool hashlock_addr(volatile void *addr);
>
I don't see how (to do FUTEX) a hashlock can be implemented in a way
that we stay in user mode when locking it and - if it's already locked -
we do a Kernel call for waiting on it being unlocked by another thread.
(This is what FUTEX does.)
-Michael
next prev parent reply other threads:[~2010-04-09 10:54 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-08 7:32 atomic RAM ? Michael Schnell
[not found] ` <4BBDA1CB.3070204@davidnewall.com>
2010-04-08 9:52 ` Michael Schnell
2010-04-12 12:54 ` Pavel Machek
2010-04-14 8:42 ` Michael Schnell
[not found] ` <k2gbca41b4c1004080243nc45a10aereaae18557808c943@mail.gmail.com>
2010-04-08 10:12 ` Michael Schnell
2010-04-08 10:45 ` Alan Cox
2010-04-08 12:11 ` Michael Schnell
2010-04-08 12:14 ` David Miller
2010-04-08 12:30 ` Michael Schnell
2010-04-08 14:15 ` Arnd Bergmann
2010-04-09 10:54 ` Michael Schnell [this message]
[not found] ` <4BBEECC8.10005@lumino.de>
[not found] ` <201004091714.04990.arnd@arndb.de>
2010-04-12 9:58 ` Michael Schnell
2010-04-12 15:02 ` Arnd Bergmann
2010-04-13 10:11 ` Michael Schnell
[not found] ` <u2j42b5547a1004120845x87d7f2f7wd4acea1144153dd6@mail.gmail.com>
2010-04-13 8:39 ` [Nios2-dev] " Michael Schnell
2010-04-08 13:37 ` Alan Cox
2010-04-09 10:55 ` Michael Schnell
2010-04-09 11:54 ` Alan Cox
2010-04-09 12:53 ` Michael Schnell
2010-04-09 13:15 ` Alan Cox
2010-04-09 13:14 ` Michael Schnell
2010-04-09 13:32 ` Michael Schnell
2010-04-14 12:46 ` Michael Schnell
2010-04-14 12:57 ` Alan Cox
2010-04-14 14:38 ` Michael Schnell
2010-04-09 1:36 ` Mike Frysinger
2010-04-09 9:23 ` Michael Schnell
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