Subj : Re: [.NET] Volatile Fields [correction]
To   : comp.programming.threads
From : Chris Thomasson
Date : Mon Sep 19 2005 09:06 pm

> If you want to do global memory barriers just using PC and nothing else,
> you can.  Just use a common memory location to "sync" everything with. 
> E.g.
[...]

Yup. This works in x86:

Processor 1:  Y = 1; L = 1;
Processor 2:  if (L == 1) { Z = 1; L = 2; }
Processor 3:  if (L == 2) { assert( Z == 1 && Y == 1 ); }

http://groups.google.com/group/comp.programming.threads/msg/68ba70e66d6b6ee9?hl=en

L is a lightweight memory barrier.

.