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svn:author
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ups
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svn:date
V 27
2005-07-03T20:08:04.000000Z
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MFC: kern/kern_switch.c 1.112, 1.114-1.116
     kern/sched_4bsd.c 1.74 1.75

Fix some race conditions for pinned threads that may cause them to run
on the wrong CPU.

Add IPI support for preempting a thread on another CPU.
( To reduce diff for future MFCs, The required MD Part to support
  IPI preemption is not part of this MFC)

END