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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