System.Environment.TickCount inaccuracies on iOS

Target Platforms Mobile
1

System.Environment.TickCount seems to be inaccurate on iOS.
Using: Unity 5.4.3f1, iOS 8.2, iPad Mini
Logging System.Environment.TickCount on launch gives the following values (samples are in chronological order):

TickCount Delta from previous
-940502954
-940503130 -176
-940502835 295
-940503575 -740
-940503154 421
-940503113 41

As can be seen above, some of the delta values are negative.

TickCount behaves as expected on Android.

Unity 5.0.1p4 has a TickCount related fix. How to know if this fix is there in Unity 5.4.3f1 ?

  • (687587) - iOS/IL2CPP: Fixed System.Environment.TickCount on iOS.

Also, would be good to know, what exactly was the issue the above fix addressed.

Thanks.

2

This bug is corrected in 5.4.3f1. The original fix was to remove an undesired 64-bit to 32-bit integer truncation that was cause the VM runtime code to loose information. Can you submit a bug report for this issue?

3

Sure.
In the meantime I got around the problem by implementing a custom tickcount for iOS based on:
http://stackoverflow.com/questions/12488481/getting-ios-system-uptime-that-doesnt-pause-when-asleep/12490414