[cpp-threads] Re: Increment/decrement operators on atomics package

[Paul E. McKenney]

On Sat, Apr 28, 2007 at 01:56:14PM +0200, Alexander Terekhov wrote:
> On 4/28/07, Raul Silvera <rauls at ca.ibm.com> wrote:
> [...]
> >At this point we're fairly confident that SC is achievable on current PPC
> >implementations by having hwsyncs between each pair of accesses. It is
> >widely believed that this was the intent of the architecture,
> 
> This is news for me. Consider:
> 
> http://citeseer.ist.psu.edu/adve95shared.html
> 
> "partly supported by an IBM ...  supported by DARPA"
> 
> ;-)

This paper predates my time at IBM, but they tell me that the "intent
of the architecture" did change at about that time.  I believe that
the change added the notion of cumulativity described near the end of
section 1.7.1 of Book 2 of the architecture.

							Thanx, Paul