On Monday, March 11, 2002, at 10:29 AM, John M McIntosh wrote:

> Now actually I've my fingers on some of the decisions in here because 
> the
> switch from 68K to powerpc lead to some issues. Many years ago I noted 
> that if we called this routine say 2000 times a second, the overhead of 
> checking for the  clock added a good 4-5% to execution of squeak. A bad 
> thing.

There seem to be some Mach functions for memory mapping a clock into 
your address space.  I haven't tried it yet, but this could be an 
ultra-cheap + accurate clock.

Marcel


--
Marcel Weiher				Metaobject Software Technologies
marcel at metaobject.com		www.metaobject.com
Metaprogramming for the Graphic Arts.   HOM, IDEAs, MetaAd etc.