How far can you get with the coroutines classes in stdlib wi

Question

How far can you get with the coroutines classes in stdlib without kotlinx coroutines From <https stackoverflow com questions 58237116 kotlin coroutines possible without standard library> it seems technically possible but likely a dangerous path But for an existing callback API with internal threading is there a viable path to implement a suspend function without kotlinx coroutines It would also need to support cancellation in both directions

Joffrey · Answer

Why are you trying to avoid the kotlinx coroutines library

yschimke · Answer

I m not totally will use it outside core modules but wondering whether I can have a suspend function in the core module without pulling in kotlinx coroutines for everyone Java apps on the JVM that may not use kotlin or kotlin coroutines Not using it at all internally it s basically a nice to have for a public API

yschimke · Answer

If not then I ll just provide some extension methods but thought it worth checking The last SO answer suggests it is possible

yschimke · Answer

I guess the parallel here is guava listenable future It s just enough to use ListenableFuture in a library API without bringing in Guava in it s entirety It s still hard to actually implement that method because you need an ListenableFuture implementation Androidx has a private implementation that shows it s possible but not simple <https cs android com androidx platform frameworks support + androidx main concurrent concurrent futures src main java androidx concurrent futures ResolvableFuture java|https cs android com androidx platform frameworks support + androidx main concurre c main java androidx concurrent futures ResolvableFuture java>

yschimke · Answer

Seems similar here suspendCoroutine is in stdlib but doesn t seem to support cancellation

Joffrey · Answer

AFAIK you could use `suspendCoroutine` without kotlinx coroutines but if you want cancellation you might need the kotlinx coroutines library The structured concurrency with Jobs and cancellation is all defined in the coroutines library so it would make sense to not have related helpers in the stdlib

yschimke · Answer

Thanks makes sense I ll stick with clean extension methods outside of core