Commits
Matt Wright committed e32016ffd76
[libdispatch-time-signedness] Correct signedness handling of DispatchTimeInterval
* DispatchTimeInterval's internal interval computation should be
done with signed integers to allow for negative intervals. This
moves all the unsigned conversions out to the API calls that can
only accept positive intervals (timer sources and IO interval) and
allows intermediate TimeIntervals to have a negative value.