Light-weight threads

[sybrandy]

> Norbert, you are confusing threads with fibers. OS Threads have never
> been, nor will ever be, "light-weight" in any sense of the word. If they
> were, no one would care about thread-pools and the like. Languages that
> feature light-weight threads, such as Erlang, are actually spawning
> fibers. The Erlang runtime, for example, only ever uses one D style
> thread to host millions of 'logical' threads.

Actually, newer versions of Erlang now use multiple threads, typically 1 
per CPU and one pool of processes and a scheduler per thread.  Processes 
can also be moved between threads in case one is busier than the others.

Casey