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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Michael Schnell <mschnell@lumino.de>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
	nios2-dev <nios2-dev@sopc.et.ntust.edu.tw>
Subject: Re: atomic RAM ?
Date: Fri, 9 Apr 2010 14:15:18 +0100	[thread overview]
Message-ID: <20100409141518.0dbe7050@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <4BBF2351.3040506@lumino.de>

> If you think it could be done with NIOS: using store ordering, how can I
> implement a  pthread_mutex_..() workalike ?

Lamport's Bakery is the classic algorithm for doing this. It has very
minimal assumptions about visibility of writes and the order they are
seen so should certainly work uniprocessor and may work SMP depending
upon the cache coherency rules.

It doesn't scale well to large numbers of threads however.

Alan

  reply	other threads:[~2010-04-09 13:11 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
     [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 [this message]
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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