Seth Kurtzberg wrote:
I have a related question. The docs state that in some environments O/S
threads are used when the -threaded flag is used with ghc, and non-O/S threads
are used otherwise (presumably these are non-preemptive). Does this apply as
well to the worker threads that are the subject of this email?
It sounds like the docs are a bit unclear. Which bit of doc in
particular are you referring to?
forkIO always creates a lightweight thread. With -threaded, if a thread
makes a safe foreign call, then that call might execute concurrently
with other threads, because another OS thread (a worker thread) takes
over in the runtime. In the HEAD (which will be 6.6), we now allow
multiple OS threads in the runtime, so you also get to run multiple
Haskell threads simultaneously, which is particularly useful if you have
more than one CPU.
Cheers,
Simon
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