ttydev_cdevsw has no d_purge

[Hans Petter Selasky]

On Wednesday 08 August 2012 19:24:18 Ed Schouten wrote:
> 2012/8/8 Hans Petter Selasky <hselasky at c2i.net>:
> >> I have a question regarding the changed fragment of code. Why don't you
> >> use unr(9) KPI to manage unit numbers ?
> > 
> > Probably I could, but right now the unr interface doesn't support pending
> > unit free which I need for other reasons, see below.
> 
> What does `pending unit free' mean? I also would prefer it if you used
> unr(9) -- not just here, but across the entire USB stack.

It is like a drain state, where a unit is collected for free, and then 
committed to free state when the tsw_free() is called. In the [unlocked] time 
in between the unit cannot be re-used.

--HPS