x/mobile: thread wakeup limitation on iOS

[hajimehoshi]

We found my gomobile iOS application crash with the below message:

Event:           wakeups
Action taken:    none
Wakeups:         45001 wakeups over the last 64 seconds (704 wakeups per second average), exceeding limit of 150 wakeups per second over 300 seconds
Wakeups limit:   45000
Limit duration:  300s
Wakeups caused:  45001
Duration:        17.04s
Steps:           18

Hardware model:  iPhone8,1
Active cpus:     2
Boot args: 

I guess Go runtime switched threads so many times that iOS complained, but I am not sure. It is hard to create a minimal code to reproduce this problem, but I'd like to report this (potential) problem in gomobile.

[eliasnaur]

Please do try to figure out a way to reproduce the error; fixing the problem will be much more likely if you do.

[eliasnaur]

I found a thread with a similar issue: https://forum.unity.com/threads/the-weird-ios8-unity3d-hiccup.273186/. It seems that Unity apps don't actually crash, only freezes while the exception report is generated.