K 10
svn:author
V 4
jeff
K 8
svn:date
V 27
2007-07-17T22:36:56.000000Z
K 7
svn:log
V 310
 - Optimize the amd64 cpu_switch() TD_LOCK blocking and releasing to
   require fewer blocking loops.
 - Don't use atomic ops with 4BSD or on UP.
 - Only use the blocking loop if ULE is compiled in.
 - Use the correct memory barrier.

Discussed with:	attilio, jhb, ssouhlal
Tested by:	current@
Approved by:	re

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