K 10
svn:author
V 3
bms
K 8
svn:date
V 27
2003-10-05T09:35:08.000000Z
K 7
svn:log
V 220
Add a pre-emption counter, td_generation, so that threads can notice
when they have been pre-empted by other threads. This is bumped from
within mi_switch() every time a context switch takes place.

Discussed with:	pete

END