Subj : Re: A question about atomic_ptr
To   : comp.programming.threads
From : Chris Thomasson
Date : Sun Apr 17 2005 09:32 am

>
> ac_i686_lfgc_smr_activate_reload:
>  mov eax, [ecx]
>  mov [edx], eax
>  mfence
>  cmp eax, [ecx]
>  jne ac_i686_lfgc_smr_activate_reload
>
> Have you tried lock mov [edx], eax or lock cmp eax, [ecx]?

Yes. You "should" try to avoid using that prefix. No need to lock a cache 
line or "possibly" lock the bus for SMR i686 impl.


BTW, the cmp instruction can not be used with lock prefix...

.