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kazu-yamamoto/gist:9428e2512fb91f06010ad0f0f36def27

Last active June 24, 2016 23:21
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concurrent hello world in Haskell
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gistfile1.hs
module Main where
import Control.Concurrent
main :: IO ()
main = do
mvar <- newEmptyMVar
_ <- forkIO $ child mvar
action <- takeMVar mvar
action
child :: MVar (IO ()) -> IO ()
child mvar = putMVar mvar (putStrLn "Hello World!")
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