Loom is an interesting project whose goal is to explore and incubate Java VM features and APIs built on top of them for the implementation of lightweight user-mode threads (fibers). If all go well, Loom will be merged into a future jdk release.
Nginx-Clojure should detect this feature and use this JVM built-in coroutine if it is available. By then it will be easy for us to use coroutine and wave configurations can be omitted.