Faking Uptime

[David Dunham]

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
Voice/Fax: 206 783 7404             http://www.pensee.com/dunham/
Imagination is more important than knowledge. -- Albert Einstein