Subj : Re: A question about atomic_ptr
To   : comp.programming.threads
From : Joe Seigh
Date : Tue Apr 19 2005 07:53 am

On Mon, 18 Apr 2005 22:50:52 -0700, Chris Thomasson <_no_damn_spam_cristom@_no_damn_comcast.net_spam> wrote:

>> Chris Thomasson wrote:
>>>> mfence fails with exception C000001E, "an attempt was made to
>>>> execute an invalid lock sequence". Athlon XP 2800+.
>
> Odd... I have successfully executed the mfence instructions on xeon
> (2/4/8-way) boxes. You should check if mfence is fully supported, use cpuid.
>
>
>
>
>> This won't work as I don't compile with GCC, but if you are concerned
>> about
>> compiler reordering, this is not an issue. I've looked at the disassembly
>> and it's correct. The mfence instruction just causes an exception.
>
> Anyone else having problems???
>
>
>
I don't because I don't use it.  MFENCE isn't on P3's which is what I have.



-- 
Joe Seigh

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

.