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import Debug.QuickCheck
import System.IO.Unsafe
import Control.Concurrent.QSem
import Control.Concurrent
import Control.Monad
main = do
t <- myThreadId
forkIO (threadDelay 1000000 >> killThread t)
-- just in case we deadlock
testQSem
data Action = NewQSem Int | SignalQSem | WaitQSem
deriving (Eq,Show)
testQSem :: IO ()
testQSem = do
quietCheck prop_SignalWait
quietCheck prop_WaitSignal
quietCheck = check defaultConfig{configEvery = \n args -> ""}
prop_SignalWait n =
n>=0 ==> [NewQSem n,SignalQSem,WaitQSem] =^ [NewQSem n]
prop_WaitSignal n =
n>=1 ==> [NewQSem n,WaitQSem,SignalQSem] =^ [NewQSem n]
perform :: [Action] -> IO ()
perform [] = return ()
perform (a:as) =
case a of
NewQSem n -> newQSem n >>= \qs -> perform' qs as
_ -> error $ "Please use NewQSem as first action" ++ show a
perform' :: QSem -> [Action] -> IO ()
perform' _ [] = return ()
perform' qs (a:as) =
case a of
SignalQSem -> signalQSem qs >> perform' qs as
WaitQSem -> waitQSem qs >> perform' qs as
_ -> error $ "If you want to use " ++ show a
++ " please use the =^ operator"
actions :: Gen [Action]
actions = do
i <- arbitrary
liftM (NewQSem i:) (actions' i)
actions' :: Int -> Gen [Action]
actions' quantity =
oneof ([return [],
liftM (SignalQSem:) (actions' (quantity+1))] ++
if quantity<=0
then []
else [liftM (WaitQSem:) (actions' (quantity-1))])
(=^) :: [Action] -> [Action] -> Property
c =^ c' =
forAll (actions' (delta 0 c))
(\suff -> observe c suff == observe c' suff)
where observe x suff = unsafePerformIO (perform (x++suff))
(^=^) :: [Action] -> [Action] -> Property
c ^=^ c' =
forAll actions
(\pref -> forAll (actions' (delta 0 (pref++c)))
(\suff -> observe c pref suff ==
observe c' pref suff))
where observe x pref suff = unsafePerformIO (perform (pref++x++suff))
delta :: Int -> [Action] -> Int
delta i [] = i
delta _ (NewQSem i:as) = delta i as
delta i (SignalQSem:as) = delta (i+1) as
delta i (WaitQSem:as) = delta (if i<=0
then error "wait on 'empty' QSem"
else i-1) as
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