Though source modules things compile, no programs have yet been
built and tested that actually use networking (as opposed to support
functions, like inet_aton).
should be decided on; it is kind of a toss-up to me personally.
One method is slightly more complicated but the other uses a spin lock.
See once.c for details.
Wrote isc_time_nowplusinterval, a new function added to unix/time.c.
Made some LARGE_INTEGERS to be ULARGE_INTEGERS to ameliorate any
possible hint of a signed vs unsigned problem, even though it would
not happen for 28,847 more years from now.
Assert t1 and t2 not NULL in isc_time_millidiff.