Re: Faking Uptime

FROM : David Dunham
DATE : Wed Mar 19 22:26:24 2008

On 19 Mar 2008, at 11:46, David Dunham wrote:

>> Have you checked your code to make sure you're not converting an 
>> uptime (TickCount, Microseconds, etc.) calculation into 
>> milliseconds while using a signed 32-bit value?

>
> Well yes, I'm sure the bug is something like that. But I didn't 
> spot anything obvious the last time I had a 25-day machine (which 
> unfortunately got rebooted before I solved the bug). I'd like to be 
> able to debug and see where the value gets flipped negative.



It's not actually negative -- I think AbsoluteToDuration maxes out 
after ~25 days. (It doesn't wrap, the way its Windows equivalent does 
after 50.) I'm using AbsoluteToNanoseconds now.

So now I'd still like a way to force UpTime() (it's in 
DriverServices.h) to return a value of 50 days, to test my fix, and 
have QA verify it.

BTW, none of these functions are documented in Xcode. And I updated 
Developer Documentation yesterday...

David Dunham
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Imagination is more important than knowledge. -- Albert Einstein