Hello I'm developing mp-project where I need a sh...

# multiplatform

[Aleksey Zhidkov]

Hello

I'm developing mp-project where I need a shared strucutre (actually map of immutable key-values), that potentially may be accessed from different threads, but writes will be executed from single thread.

Currently I'm considering approach with coroutines and custom SignleThreadDispatcher (Default on JS, Executors-based on JVM and Worker-based on Native), but I cannot find a way of hiding freezing concept from common code. Is there some possibility to do it?

I want to inject serialization of writes here: https://github.com/d-r-q/qbit/blob/master/qbit-core-jvm/src/commonMain/kotlin/qbit/serialization/NodesStorage.kt#L14

And here is map-based storage implementation: https://github.com/d-r-q/qbit/blob/master/qbit-core-jvm/src/commonMain/kotlin/qbit/storage/MemStorage.kt

[Aleksey Zhidkov]

Ok, in this post: https://helw.net/2020/04/16/multithreading-in-kotlin-multiplatform-apps/

I found, that "Note that objects will be frozen when they are transferred between threads using `withContext`"

Will check it

[Aleksey Zhidkov]

hm, but looks like I still need some thread-safe data structure for jvm due to java memory model semantics

[Aleksey Zhidkov]

For history:
newSingleThreadContext was added for native in 1.3.5-native-mt-1.4-M1
but reads also should be done via the same thread as writes either map should be immutable