generalizing fd allocation code to id allocation

[Brooks Davis]

On Wed, Feb 11, 2009 at 02:25:45PM +0100, Hans Petter Selasky wrote:
> On Wednesday 11 February 2009, Andriy Gapon wrote:
> > My nose has just been rubbed into alloc_unr(9) :)
> > Thanks, Roman!
> 
> The only problem about alloc_unr() is that you cannot allocate multiple 
> contiguous units?

You might want rman for that.  The thing I would like to see alloc_urn()
grow is that ability to request a particular value so we could use it in
the ifnet cloning code.

-- Brooks
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