Spinlocks would be the one to protect the variable and synchronies
between CPU, But it's a busy waiting mechanism(just a word of caution).
Regards,
Hannibal
-----Original Message-----
From: Jesper Juhl [mailto:[email protected]]
Sent: Friday, July 14, 2006 2:18 PM
To: [email protected]
Cc: [email protected]
Subject: Re: SMP share data declaration
On 14/07/06, [email protected] <[email protected]> wrote:
> I know that an integer variable should be declared volatile to share
between
> CPUs.
NO. volatile won't protect you sufficiently.
Use spinlocks, mutexes, semaphores, barriers and the like to protect
variables from concurrent access. Using volatile for this is a BUG and
it won't work correctly.
--
Jesper Juhl <[email protected]>
Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html
Plain text mails only, please http://www.expita.com/nomime.html
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