Subj : Re: CMPXCHG timing
To   : comp.programming.threads
From : Joe Seigh
Date : Fri Apr 01 2005 09:29 am

On Fri, 01 Apr 2005 15:17:15 +0200, Alexander Terekhov <terekhov@web.de> wrote:

>
> 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
>

Still morning here.


-- 
Joe Seigh

.