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.

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

there’s

atomicLazy

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

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

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.

Then this is your way!