Are worker threads green?

[shivam-tripathi]

From what I understood after reading some of really helpful articles by Mayank, Deno internally uses green threads to carry out async tasks (which I assume are I/O tasks).

But it's not immediately clear if worker threads are internally green threads or internally backed by native threads. From my very limited understanding after reading the spec - it isn't explicitly specified how worker threads should be implemented internally. Having ability to spawn green threads which communicate via message passing to me personally sounds like a great idea.

[bartlomieju]

There's a chapter in the manual that explains this topic: https://deno.land/manual@v1.17.0/runtime/workers

The gist is that each worker gets a dedicated OS thread, they do not use green threads.