On Jan 15, 2007, at 12:25 PM, James W. Walker wrote:
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.
UpTime and mach_absolute_time are monotonically increasing clocks.
CFAbsoluteTimeGetCurrent tracks wall time and returns units since
Midnight Jan 1 2001 GMT. If your clock changes, UpTime and
mach_absolute_time are unaffected, while CFAbsoluteTimeGetCurrent
might skip forward suddenly or jump back, depending on the change in
your clock.
--
David Duncan
Apple DTS Quartz and Printing
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