> > And another thing, it would be nice to commit new drivers without
> > splfoo(), and convert them to use mutexes/condvars/etc.
> 
> Sure. But the mutex(9) isn't clear as to when to use what kind of mutexes,
> what the arguments are for, etc ...

Agreed, it's a bit of a mess. I cleaned the page up a bit and added some
more text so hopefully it's clearer now. Suggestions welcome.

   http://www.netbsd.org/~ad/mutex.txt

Cheers,
Andrew