[Haskell-cafe] forkIO on GHCI does not seem to spawn the thread in the background on some OSs

[David Leimbach]

> > It is  not always a thread.  ForkIO creates a spark and then the
> > scheduler  decides when sparks should be scheduled to threads.  Thus
> > you get a  guarantee of concurrent but not parallel execution.
>
> That is not correct - it is "par" that creates sparks may be discarded.
>

I guess I should have been clearer.  A forkIO thread is not an OS thread
necessarily.  Sparks may become threads or be discarded in the par sense.



> forkIO always creates new threads, though it is of course up to the
> scheduler
> when the threads are executed, and how many cores are used.
>

Yes, this is my understanding as well.
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