What are the real advantages that D offers in multithreading?

[Kagamin via Digitalmars-d]

On Saturday, 30 January 2016 at 17:46:35 UTC, Sean Kelly wrote:
> Netty and NIO are an event dispatching mechanism (think 
> libebevent) backed by a ForkJoinPool. No fibers there. Java 
> /does/ have fibers in Quasar, though the implementation is a 
> bit weird because the Java instruction set doesn't support 
> continuations.

I mean approach to the same problem of handling of many requests, 
that fibers are used for in vibe.d.