Question about kse_switchin and TD_CAN_UNBIND

[Andy Jones]

I'm curious about the meaning of the TDP_CAN_UNBIND flag being set on a
thread (in its td_pflags) (see sys/proc.h). What does it mean that a thread
"can unbind"? Second, why it is important that it is not set in kse_switchin
(see kern/kern_kse.c) . (The answer to second question will probably become
obvious with the answer to the first).

  -andy jones