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import Control.Exception
import Control.Concurrent
import Text.Printf
-- Test combinations of nesting mask/uninterruptibleMask with
-- forkIO/forkIOWithUnmask
main = do
m <- newEmptyMVar
t1 <- mask_ $ forkIO $ do
takeMVar m `catch` \e -> do stat 1 MaskedInterruptible
print (e::SomeException)
throwIO e
killThread t1
t2 <- uninterruptibleMask_ $ forkIO $ do
takeMVar m `catch` \e -> do stat 2 MaskedUninterruptible
print (e::SomeException)
throwIO e
killThread t2
t3 <- mask_ $ forkIOWithUnmask $ \unmask ->
unmask $ do stat 3 Unmasked; putMVar m ()
takeMVar m
t4 <- uninterruptibleMask_ $ forkIOWithUnmask $ \unmask ->
unmask $ do stat 4 Unmasked; putMVar m ()
takeMVar m
stat :: Int -> MaskingState -> IO ()
stat n m = do
s <- getMaskingState
if (s /= m)
then error (printf "%2d: %s\n" n (show s))
else return ()
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