Function core.time.TickDuration.currSystemTick
The current system tick. The number of ticks per second varies from
system to system. currSystemTick uses a monotonic clock, so it's
intended for precision timing by comparing relative time values, not for
getting the current system time.
On Windows, QueryPerformanceCounter is used. On Mac OS X,
mach_absolute_time is used, while on other Posix systems,
clock_gettime is used. If mach_absolute_time or
clock_gettime is unavailable, then Posix systems use
gettimeofday (the decision is made when TickDuration is
compiled), which unfortunately, is not monotonic, but if
mach_absolute_time and clock_gettime aren't available, then
gettimeofday is the the best that there is.
Warning: On some systems, the monotonic clock may stop counting when the computer goes to sleep or hibernates. So, the monotonic clock could be off if that occurs. This is known to happen on Mac OS X. It has not been tested whether it occurs on either Windows or on Linux.
Throws
TimeException if it fails to get the time.
Authors
Jonathan M Davis and Kato Shoichi