Is there an idiomatic way to memoize values that works multiplatform (and esp. across threads in Nat...

# multiplatform

[Marc Knaup]

Is there an idiomatic way to memoize values that works multiplatform (and esp. across threads in Native)?

E.g. private val hash: Int by lazy { … } but lazy doesn’t work across threads in Native afaik.

[Arkadii Ivanov]

I guess there is no such a way in K/N currently. Mutex requires explicit destroy. I would go with something based on atomics.

[saket]

there’s atomicLazy that you can use

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.native.concurrent/atomic-lazy.html

[Arkadii Ivanov]

Yep, but I would guess it can call the lambda multiple times under heavy concurrent access. Just like in normal atomics.

[Marc Knaup]

Thanks, that sounds good!
So I basically use lazy on JVM/JS and atomicLazy on native 🙂
The part “may potentially leak memory” sounds a bit worrying. But I don’t have cyclical references here so it’s probably OK.

My operations are idempotent, so it’s okay if the lambda is called multiple times.

[Arkadii Ivanov]

Then this is your way!