Kotlin/Native Concurrency Model

on YouTube ↗46m

" summary

Kotlin/Native implements a runtime-level concurrency model that prevents shared mutable state by default, using freeze to mark an object and its reachable graph immutable and throwing on mutation, a local reference-counting collector plus cycle detection, and ownership transfer via worker.execute with safe/unsafe transfer modes. It supplies detached object graph wrappers, arenas and permanent/concurrent containers, atomic primitives, and C/Objective‑C interop via stableRef and pinning. Examples include 4‑core factorization and ping‑pong between main and workers that run correctly under these rules.

AI-written summary · about

" chapters (20)

1. 0:00Intro
2. 1:06WHAT DO WE WANT FROM CONCURRENCY?
3. 2:11CONCURRENCY IN KOTLIN
4. 3:59SHARED HEAP ON JVM
5. 4:32THE CURSE OF SHARED OBJECT HEAP
6. 8:15DO WE REALLY NEED OBJECT SHARING?
7. 10:01KOTLIN/NATIVE AT LARGE
8. 12:37KOTLIN/NATIVE MEMORY MANAGER
9. 20:04FREEZING
10. 22:51OBJECT GRAPHS CONDENSATION
11. 24:49CONCURRENT EXECUTORS - WORKERS
12. 26:07OBJECT TRANSFER
13. 27:34WORKER.EXECUTE
14. 30:14OBJECT PING-PONG EXAMPLE
15. 32:41WHY OBJECT GRAPH DETACHMENT?
16. 34:17GLOBAL VARIABLES
17. 34:57IMPORTANT CASES
18. 35:44SHARED CACHE EXAMPLE
19. 36:57CONCURRENCY AND INTEROP
20. 38:24CONCLUSIONS

" related talks

• 39mKotlin Native Concurrency ExplainedKevin Galligan · droidcon Toronto 2019
• 39mKotlin Native Concurrency ExplainedKevin Galligan · KotlinConf 2019
• 44mKotlin/Native Concurrency for Mobile MultiplatformKevin Galligan · Conference for Kotliners 2020
• 42mKotlin Multiplatform multithreading old and new wayAnna Zharkova · droidcon Berlin 2022
• 26mKotlin/Native for Multiplatform DevelopmentEnrique López Mañas · Conference for Kotliners 2019
• 41mCoroutines for Kotlin Multiplatform in practiseChristian Melchior · droidcon Berlin 2021
• 31mKotlin/Native for Multiplatform DevelopmentEnrique López Mañas · AndroidTO 2018
• 38mKotlin/NativeEllen Shapiro · UIKonf 2019