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https://kotlinlang.org/docs/reference/coroutines/cancellatio...

Loom will have superior context cancellation and deadline handling than golang. https://cr.openjdk.java.net/~rpressler/loom/loom/sol1_part1....

I didn't read all of it, but I was wondering: In a virtual loom thread, am I allowed to call currentThread().sleep(...); or will it block the system thread? Or is there some magic like currentThread().sleepAndThen(..., ()->{}); ?

CompletableFuture is the closest concept in Java, to my knowledge.

java.util.concurrent has a ton of great classes. If you need to do shared memory concurrency, it probably has something there to help you.