Subj : Re: Three membar-related questions
To   : comp.programming.threads
From : Alexander Terekhov
Date : Sat Feb 05 2005 02:26 pm


Ziv Caspi wrote:
[...]
> While read-after-read and write-after-write are made in order, x86 may
> reverse the order of read-after-write.

Note that revised Java volatiles (and JSR-166 atomics) are meant 
to prohibit such reordering. They are more stringent than classic 
acquire/release. That makes them "expensive" even on x86.

regards,
alexander.

.