lock-free data structures aren't useful for all data structures.
sometimes you need to fiddle with a LOT of stuff inside the lock,
not just add one to a counter.

as you say, this is a very machine-specific operation and while
some code in netbsd could benefit from such a scheme i'm sure,
making that code portable in an MI place could be difficult and
require a lot of MD support code to be written.  in other words,
we haven't rejected this approach but no one has made a good
case for it or produced the code, yet


.mrg.