[Haskell-cafe] Re: are forkIO threads event-driven?

Maciej Piechotka uzytkownik2 at gmail.com
Thu Apr 29 20:46:33 EDT 2010

On Thu, 2010-04-29 at 18:26 -0400, Aran Donohue wrote:
> Hi Cafe,
> In GHC, if a thread spawned by forkIO blocks on some network or disk
> IO, is the threading system smart enough not to wake the thread until
> an IO event occurs on its input/output? The Control.Concurrent
> documentation doesn't specify, and the previous discussions I could
> find on this topic are out-of-date. There is a years-old GHC ticket,
> too, recently revived[2].
> Put another way, is it possible yet to use forkIO for making a server
> to handle tens of thousands of concurrent network connections? If not,
> what is the best current Haskell/GHC way?
> Thanks,
> Aran

IIRC yes - they explicitly waits for read (waitForRead or something like
that) on GHC. 


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