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module Main where
import Control.Concurrent
-- example from
-- http://www.haskell.org/pipermail/glasgow-haskell-users/2008-November/015878.html
main = do
m <- newMVar (0 :: Int)
forkIO $ putMVar m 1
yield
r1 <- readMVar m
r2 <- takeMVar m
r3 <- takeMVar m
return ()
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