K 10
svn:author
V 5
mmacy
K 8
svn:date
V 27
2018-05-17T00:45:35.315921Z
K 7
svn:log
V 219
epoch(9): Guarantee forward progress on busy sections

Add epoch section to struct thread. We can use this to
ennable epoch counter to advance even if a section is
perpetually occupied by a thread.

Approved by:	sbruno

END