Subj : Re: Memory visibility and MS Interlocked instructions
To   : comp.programming.threads
From : Alexander Terekhov
Date : Thu Aug 25 2005 10:52 pm


Joe Seigh wrote:
[...]
> Yes on the first part.  

No on the first part to the extent that "... thread W (the writer) 
writes a value to variable x and thread R (the reader) later reads 
the value of x ...  to guarantee that R sees the value written by 
W, W must follow the write with a release membar and R must 
precede the read with an acquire membar" is not true on shared 
memory MP hardware level where acquire and release merely ensure 
ordering with respect to other accesses.

regards,
alexander.

.