In some email I received from Lennart Augustsson, sie wrote:
> 
> > Hmm, AFAICT there is no MI way to tell whether you are in an interrupt
> > context or not :-(.
> So then my next question is: shouldn't there be a way?
> I think it would be a great improvement if tsleep() panics
> if called from an interrupt context instead of doing something
> weird (and panic somewhere deeper down if curproc==0).

What about hard vs soft interrupts ?

What about if sometime later we have dedicated threads handling
interrupts (curproc==0 would be false) ?

Sometimes you just need to program properly and this is one of those.

Darren