dejafu/dejafu-tests/Cases/SingleThreaded.hs

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{-# LANGUAGE CPP #-}
module Cases.SingleThreaded where
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import Control.Exception (ArithException(..), ArrayException(..))
import Test.DejaFu (Failure(..), gives, gives')
import Test.Framework (Test, testGroup)
import Test.Framework.Providers.HUnit (hUnitTestToTests)
import Test.HUnit (test)
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import Test.HUnit.DejaFu (testDejafu)
import Control.Concurrent.Classy
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import Control.Monad.STM.Class
import Utils
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#if __GLASGOW_HASKELL__ < 710
import Control.Applicative ((<$>), (<*>))
#endif
tests :: [Test]
tests =
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[ testGroup "MVar" . hUnitTestToTests $ test
[ testDejafu emptyMVarTake "empty take" $ gives' [True]
, testDejafu emptyMVarPut "empty put" $ gives' [()]
, testDejafu fullMVarPut "full put" $ gives' [True]
, testDejafu fullMVarTake "full take" $ gives' [True]
, testDejafu fullMVarRead "full read" $ gives' [True]
]
, testGroup "CRef" . hUnitTestToTests $ test
[ testDejafu crefRead "read" $ gives' [True]
, testDejafu crefWrite "write" $ gives' [True]
, testDejafu crefModify "modify" $ gives' [True]
, testDejafu crefTicketPeek "ticket peek" $ gives' [True]
, testDejafu crefCas1 "cas" $ gives' [(True, True)]
, testDejafu crefCas2 "cas (modified)" $ gives' [(False, False)]
]
, testGroup "STM" . hUnitTestToTests $ test
[ testDejafu stmWrite "write" $ gives' [True]
, testDejafu stmPreserve "write (across transactions)" $ gives' [True]
, testDejafu stmRetry "retry" $ gives [Left STMDeadlock]
, testDejafu stmOrElse "or else" $ gives' [True]
, testDejafu stmCatch1 "single catch" $ gives' [True]
, testDejafu stmCatch2 "nested catch" $ gives' [True]
]
, testGroup "Exceptions" . hUnitTestToTests $ test
[ testDejafu excCatch "single catch" $ gives' [True]
, testDejafu excNest "nested catch" $ gives' [True]
, testDejafu excEscape "uncaught" $ gives [Left UncaughtException]
, testDejafu excCatchAll "catch all" $ gives' [(True, True)]
, testDejafu excSTM "from stm" $ gives' [True]
]
, testGroup "Capabilities" . hUnitTestToTests $ test
[ testDejafu capsGet "get" $ gives' [True]
, testDejafu capsSet "set" $ gives' [True]
]
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]
--------------------------------------------------------------------------------
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-- @MVar@s
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-- | An empty @MVar@ cannot be taken from.
emptyMVarTake :: MonadConc m => m Bool
emptyMVarTake = do
var <- newEmptyMVar
res <- tryTakeMVar var
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return $ (res :: Maybe ()) == Nothing
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-- | An empty @MVar@ can be put into.
emptyMVarPut :: MonadConc m => m ()
emptyMVarPut = do
var <- newEmptyMVar
putMVar var ()
-- | A full @MVar@ cannot be put into.
fullMVarPut :: MonadConc m => m Bool
fullMVarPut = do
var <- newMVar ()
not <$> tryPutMVar var ()
-- | A full @MVar@ can be taken from.
fullMVarTake :: MonadConc m => m Bool
fullMVarTake = do
var <- newMVar ()
(() ==) <$> takeMVar var
-- | A full @MVar@ can be read from.
fullMVarRead :: MonadConc m => m Bool
fullMVarRead = do
var <- newMVar ()
(() ==) <$> readMVar var
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--------------------------------------------------------------------------------
-- @CRef@s
-- | A @CRef@ can be read from.
crefRead :: MonadConc m => m Bool
crefRead = do
ref <- newCRef (5::Int)
(5==) <$> readCRef ref
-- | A @CRef@ can be written to.
crefWrite :: MonadConc m => m Bool
crefWrite = do
ref <- newCRef (5::Int)
writeCRef ref 6
(6==) <$> readCRef ref
-- | A @CRef@ can be modified.
crefModify :: MonadConc m => m Bool
crefModify = do
ref <- newCRef (5::Int)
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atomicModifyCRef ref (\i -> (i+1, ()))
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(6==) <$> readCRef ref
-- | A @Ticket@ contains the value as of when it was created.
crefTicketPeek :: MonadConc m => m Bool
crefTicketPeek = do
ref <- newCRef (5::Int)
tick <- readForCAS ref
writeCRef ref 6
(5==) <$> peekTicket tick
-- | A compare-and-swap can be done on a @CRef@ which hasn't been
-- modified.
crefCas1 :: MonadConc m => m (Bool, Bool)
crefCas1 = do
ref <- newCRef (5::Int)
tick <- readForCAS ref
(suc, _) <- casCRef ref tick 6
val <- readCRef ref
return (suc, 6 == val)
-- | A compare-and-swap cannot be done on a @CRef@ which has been
-- modified.
crefCas2 :: MonadConc m => m (Bool, Bool)
crefCas2 = do
ref <- newCRef (5::Int)
tick <- readForCAS ref
writeCRef ref 6
(suc, _) <- casCRef ref tick 7
val <- readCRef ref
return (suc, 7 == val)
--------------------------------------------------------------------------------
-- STM
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-- | A @TVar@ can be written to.
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stmWrite :: MonadConc m => m Bool
stmWrite =
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(6==) <$> atomically (do { v <- newTVar (5::Int); writeTVar v 6; readTVar v })
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-- | A @TVar@ preserves its value between transactions.
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stmPreserve :: MonadConc m => m Bool
stmPreserve = do
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ctv <- atomically $ newTVar (5::Int)
(5==) <$> atomically (readTVar ctv)
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-- | A transaction can be aborted, which blocks the thread.
stmRetry :: MonadConc m => m ()
stmRetry = atomically retry
-- | An abort can be caught by an @orElse@.
stmOrElse :: MonadConc m => m Bool
stmOrElse = do
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ctv <- atomically $ newTVar (5::Int)
atomically $ orElse retry (writeTVar ctv 6)
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(6==) <$> atomically (readTVar ctv)
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-- | An exception can be caught by an appropriate handler.
stmCatch1 :: MonadConc m => m Bool
stmCatch1 = do
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ctv <- atomically $ newTVar (5::Int)
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atomically $ catchArithException
(throwSTM Overflow)
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(\_ -> writeTVar ctv 6)
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(6==) <$> atomically (readTVar ctv)
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-- | Nested exception handlers can catch different types of exception.
stmCatch2 :: MonadConc m => m Bool
stmCatch2 = do
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ctv <- atomically $ newTVar (5::Int)
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atomically $ catchArithException
(catchArrayException
(throwSTM Overflow)
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(\_ -> writeTVar ctv 0))
(\_ -> writeTVar ctv 6)
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(6==) <$> atomically (readTVar ctv)
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--------------------------------------------------------------------------------
-- Exceptions
-- | An exception can be caught by an appropriate handler.
excCatch :: MonadConc m => m Bool
excCatch = catchArithException
(throw Overflow)
(\_ -> return True)
-- | Nested exception handlers can catch different types of exception.
excNest :: MonadConc m => m Bool
excNest = catchArithException
(catchArrayException
(throw Overflow)
(\_ -> return False))
(\_ -> return True)
-- | Exceptions of the wrong type kill the computation
excEscape :: MonadConc m => m ()
excEscape = catchArithException
(throw $ IndexOutOfBounds "")
(\_ -> return undefined)
-- | @SomeException@ matches all exception types.
excCatchAll :: MonadConc m => m (Bool, Bool)
excCatchAll = do
a <- catchSomeException
(throw Overflow)
(\_ -> return True)
b <- catchSomeException
(throw $ IndexOutOfBounds "")
(\_ -> return True)
return (a, b)
-- | Exceptions thrown from STM can be caught.
excSTM :: MonadConc m => m Bool
excSTM = catchArithException
(atomically $ throwSTM Overflow)
(\_ -> return True)
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--------------------------------------------------------------------------------
-- Capabilities
-- | Check that the capabilities are consistent when retrieved.
capsGet :: MonadConc m => m Bool
capsGet = (==) <$> getNumCapabilities <*> getNumCapabilities
-- | Check that the capabilities can be set.
capsSet :: MonadConc m => m Bool
capsSet = do
caps <- getNumCapabilities
setNumCapabilities $ caps + 1
(== caps + 1) <$> getNumCapabilities