RTLinux-like functionality for NetBSD?

[Greg Troxel <gdt%ir.bbn.com@localhost>]

Can anyone point me to ways to get hard real-time scheduling in
NetBSD?  I'd like several projects to be able to use NetBSD rather
than RTLinux.  The issue at the moment is implementing MAC protocols
in software (802.11 or something similar).

I found the following commercial product, which looks interesting (but
is not open source and costs money):

  http://www.fsmlabs.com/rtcorebsd.html

Does anyone have experience using this with NetBSD?