Subj : Re: CMPXCHG timing
To   : comp.programming.threads
From : Alexander Terekhov
Date : Fri Apr 01 2005 03:17 pm


Joe Seigh wrote:
> 
> On 31 Mar 2005 17:38:46 -0800, Michael Pryhodko <mpryhodko@westpac.com.au> wrote:
> 
> > Well, I have decided to show my child :) It somewhat raw but readable:
> >
> (snip)
> 
> >
> > unlock()
> > {
> >     // sanity check
> >     ASSERT(A == P);
> >
> You need the sfence here for release semantics.  Strictly speaking
> it has to be mfence (store/store + store/load)
> 
> >     // mark flag 'free'
> >     A = 0;

You need vacation, Joe. ;-) 

http://groups.google.de/groups?selm=3EBFDC37.DDDE3230%40web.de
http://groups.google.de/groups?selm=42235BEC.C06F939B%40web.de

regards,
alexander.

.