Threads vs. continuations

[Paul Rubin]

Tim Daneliuk <tundra at tundraware.com> writes:
> 'Not trying to start a fight here, I'm just curious about the
> current state of that art.  It is the case today that all
> modern language threading is realized over a kernel implementation
> of threading that behaves as you suggest?

Certainly not.  See Erlang, Haskell, Concurrent ML, etc. 
The low level i/o in the runtime systems for those languages has
to be written to never block, but the payback is much lighter weight
user threads.