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AbsoluteTime question...
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AbsoluteTime question...


  • Subject: AbsoluteTime question...
  • From: "Thomas E. Knowlton, Jr." <email@hidden>
  • Date: Fri, 27 Feb 2004 08:44:10 -0700

Apologies if this is not exactly on-topic on this list... hopefully I'm not the only Mac network programmer that needs to know this stuff...

AbsoluteTime et. al. aren't especially well-documented. Maybe to keep the casual developer from playing there.
Lots of the examples I see use AbsoluteDeltaToDuration and cast the result to a float, which I think I don't understand.

The PDF for MP services 2.1 states that AbsoluteTime is a 64-bit monotonically-increasing value. What do you think of the following interpretation of that statement:

void On_T_DATA(void) // gets called every time T_DATA is received on the OT notifier proc.
{
AbsoluteTime arrTime(UpTime());
AbsoluteTime depTime(AddDurationToAbsolute(100, arrTime));
AbsoluteTime now;

// MY QUESTION IS REALLY ALL ABOUT THIS LINE OF CODE:
while (*reinterpret_cast<unsigned long long*>(&(now = UpTime())) < *reinterpret_cast<unsigned long long*>(&depTime))
{
// do T_DATA processing
// if (mAcptr->Rcv(...) == kOTNoDataErr) break;
// ... potentially lengthy (hundreds of usec) processing of received data...
}
}

Thanks much,
--
Tommy
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