Subj : Re: Lock Free -- where to start
To   : comp.programming.threads
From : Chris Thomasson
Date : Tue Oct 04 2005 08:46 am

>> A hazard pointer implementation with 2 memory barriers, one
>> for release semantics and the other for the "store/load" barrier,
>> on a 866 Mhz P3 with XCHG to simulate the membars is 81 nsec w/
>> membars and 8 nsec w/o membars on a 1.2 Ghz powerpc it's
>
> Eh, you don't need membars on x86 except for some SSE-operations.

You do need a full membar for x86 when you algorithm can't handle the fact 
that a store followed by a load to another location can, and will, be 
reordered...

.