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{-# OPTIONS_GHC -cpp #-}
{-# LANGUAGE ForeignFunctionInterface #-}
module Main where
import Control.Concurrent
#ifdef mingw32_HOST_OS
foreign import stdcall safe "Sleep" _sleepBlock :: Int -> IO ()
sleepBlock n = _sleepBlock (n*1000)
#else
foreign import ccall safe "sleep" sleepBlock :: Int -> IO ()
#endif
main :: IO ()
main = do
th <- newEmptyMVar
forkIO $ do
putStrLn "newThread started"
sleepBlock 1
putStrLn "newThread back again"
putMVar th "1 sec later"
threadDelay 200000 -- make sure the newly created thread is run.
putStrLn "mainThread"
x <- takeMVar th
putStrLn x
putStrLn "\nshutting down"
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