lkml.org 
[lkml]   [2000]   [Jan]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: (*(unsigned long *)&jiffies)++;
On Mon, 10 Jan 2000, Tigran Aivazian wrote:
> On Fri, 7 Jan 2000, Petko Manolov wrote:
> > AFAIK incl _lock_ the bus even without "lock" in fornt of the
> > instruction
> > on 386 machine. Or at least i386 instruction set manual say so.
> > But there is no word about all this in the newest manual i got from
> > Intel. Is this changed on i[56]86?
>
> The section 7.1.2.1 (of Intel PIII, Volume III) says that automatic
> LOCK-ing is done:
>
> * When executing an XCHG instruction that references memory.

ok, but what about the whole family. So i[345]86 and P II, too?
Are any buggy mask revisions known, that break this assumption?

Would be nice instruction for binary semaphores ;) For other
things it doesn't reduce any costs :(

> I know we all can read and cut'n'paste but sometimes it is nice to find
> useful facts in a single email message :)

Agree ;) <Put in persistent archive...>

Regards

Ingo Oeser
--
Feel the power of the penguin - run linux@your.pc
<esc>:x


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:55    [W:1.738 / U:0.388 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site