Subj : Re: [.NET] Volatile Fields [correction]
To   : comp.programming.threads
From : Joe Seigh
Date : Mon Sep 19 2005 11:17 pm

David Hopwood wrote:
> Joe Seigh wrote:
>>
>>AFAICT, Alexander seems to think the x86 memory model is just PC and
>>*all* of the other stuff in the x86 docs doesn't count.
> 
> 
> *Most* of the other stuff in the x86 docs is about non-WB memory types,
> or about what is visible on the system bus, as opposed to what is visible
> to processors.
> 
"In a single-processor system for memory regions defined as write-back
cacheable, the following ordering rules apply:"


> 
>>Seems a bit arbitrary and selective to me.
> 

Alexander has company here.

> 
> 
>>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.
> 
> 
> If you don't care about lousy performance due to cache line pinging.
> 

Lousy performance compared to what?

-- 
Joe Seigh

When you get lemons, you make lemonade.
When you get hardware, you make software.

.