Subj : Re: [x86] Reads/Writes
To   : comp.programming.threads
From : David Schwartz
Date : Mon Sep 26 2005 01:46 pm


"Cool Guy" <coolguy@abc.xyz> wrote in message 
news:19mbxvhed7ztx.dlg@cool.guy.abc.xyz...

> David Schwartz <davids@webmaster.com>:

>>> I've read (no pun intended) that all writes on x86 are effectively
>>> volatile
>>> writes. So does that mean that on x86 only 'read' barriers are 
>>> necessary?
>>
>>     At what level are you talking? Are you assuming that a person is 
>> writing
>> assembly language code? Or are you talking about to a C programmer?
>
> At the level of a C programmer I guess.

    Then unfortunately the hardware behavior doesn't help you because the 
compiler can reorder writes, cache data in registers, and so on.

    DS

.