How multithreading works in hardware using D ==AND== difference b/w goroutine and threads in D

[Sparsh Mittal]

Hello

I could find this for Java, but not yet for D and so wanted to 
ask:

Would you tell briefly, how multi-threading in D works on 
hardware. What I wanted to ask is: if we have a single-core or 
multicore system, how does scheduling of threads in D happens.

For Java, what I found was (in my words):

The JVM runs as a single process which internally spawns many 
threads. When the scheduler code running inside the JVM asks for 
another thread, JVM starts another thread. The execution of the 
threads is done using timeslicing, which enables threads to share 
the processor. With this approach, concurrency using 
multithreading can be achieved even on single processors. On 
multicore platforms, these threads can possibly be scheduled on 
different CPU cores. In hardware, the management of thread is 
done by the operating system (OS), and the JVM uses the facility 
provided by the OS.


My second question is: What is the difference between working of 
goroutine in Go and threads spawned in D. Both work concurrently 
with the caller (parent).

Correct me wherever wrong.

My interest in D and Go is using them for parallelizing 
scientific applications.