jeff 8fd8265087 - Catch up to setrunqueue/choosethread/etc. api changes.
- Define our own maybe_preempt() as sched_preempt().  We want to be able
   to preempt idlethread in all cases.
 - Define our idlethread to require preemption to exit.
 - Get the cpu estimation tick from sched_tick() so we don't have to worry
   about errors from a sampling interval that differs from the time
   domain.  This was the source of sched_priority prints/panics and
   inaccurate pctcpu display in top.
2007-01-23 08:50:34 +00:00
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