Provides a clock that returns nondecreasing values and is not affected by (user-adjustable) system time.
Return the current monotonic time in monotonic time units.
If mode is nil (the default) the monotonic time is possibly
affected by NTP. If it is :raw, effort is made to return a
monotonic time that is not affected by NTP.
Return the number of monotonic time units in one second.
The value returned should remain valid for the duration of the running Lisp process, but no guarantee is made beyond this extent.
A convenience function to return the current monotonic time in milliseconds.