Hi , I'm facing an issue regarding `Companion` + `...

# multiplatform

[Ahmed na]

Hi ,
I'm facing an issue regarding Companion + Coroutines + iOS and callback functions

I'm trying to call a static function inside a callback,

print("Shared object: \(Greeting.Companion.shared)")
print("start as \(Greeting.Companion.shared.getCount())")

Greeting.Companion.shared.addCount()

Greeting.Companion.shared.onCallBack {
	print("Shared object: callback \(Greeting.Companion.shared)")
	print("Should be 1 and it is: \(Greeting.Companion.shared.getCount())")
}

the output is as follow

Shared object: com.example.testcompanion.Greeting.Companion@fcc011d0
start as 0
Shared object: callback com.example.testcompanion.Greeting.Companion@fd401110
Should be 1 and it is: 0

onCallBack starts a coroutine then run the block of code provided ,

The issue is Companion object has changed and ofc all it's private members

I've created a sample project ,
Any Idea to solve this / workaround , or should i report an issue ?

[russhwolf]

You have a @ThreadLocal annotation on your companion. That means that every thread gets a different version of the object. You're incrementing count from the calling thread but reading it on a thread from Dispatchers.Default.

Remove that annotation. You shouldn't need it unless you're using the legacy memory manager.

[Ahmed na]

oh ! yes that fixed it ,
the lint was complaining about it so i though i did the right thing,

Thanks

[russhwolf]

yeah that warning is safe to ignore. "With old Native GC" doesn't apply to you unless you're on an old Kotlin version or explicitly turned it on.