linux-kernel - Re: atomic RAM ?

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Date:	Wed, 14 Apr 2010 13:57:04 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Michael Schnell <mschnell@...ino.de>
Cc:	nios2-dev <nios2-dev@...c.et.ntust.edu.tw>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: atomic RAM ?

> > FUTEX  ... is an implementation ...  for certain classes of processor.
> Alan,
> 
> If that is true "in depth", there should be no FUTEX-relevant  code,
> neither in the Kernel, nor in the library, that should be considered
> "arch-independent".

We have a lot of kernel code which is only usable on some architectures
and a few opt out of. The largest example of course being the mm layer
which is strictly for MMU equipped systems.

The important point is that you don't *have* to use futex to provide the
posix pthread lock primitives if they don't fit your platform.

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