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Re: Milliseconds


On Jan 15, 2007, at 10:46 AM, George Warner wrote:

Just for the record UpTime (and CFAbsoluteTimeGetCurrent and
mach_absolute_time) is still the lowest-overhead and highest precision clock
on PPC or Intel. (IIRC UpTime & CFAbsoluteTimeGetCurrent both call directly
thru to mach_absolute_time now.)

The reference docs for CFAbsoluteTimeGetCurrent say "Repeated calls to this function do not guarantee monotonically increasing results. The system time may decrease due to synchronization with external time references or due to an explicit user change of the clock.". Does that apply to UpTime and mach_absolute_time too? There are no reference docs for UpTime or mach_absolute_time as far as I can tell.
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