Safe Haskell	Safe
Language	Haskell2010

Concurrency.MVar

Contents

MVar

Synopsis

data MVar a
newEmptyMVar :: MonadIO m => m (MVar a)
newMVar :: MonadIO m => a -> m (MVar a)
takeMVar :: MonadIO m => MVar a -> m a
putMVar :: MonadIO m => MVar a -> a -> m ()
readMVar :: MonadIO m => MVar a -> m a
swapMVar :: MonadIO m => MVar a -> a -> m a
tryTakeMVar :: MonadIO m => MVar a -> m (Maybe a)
tryPutMVar :: MonadIO m => MVar a -> a -> m Bool
isEmptyMVar :: MonadIO m => MVar a -> m Bool
withMVar :: MonadUnliftIO m => MVar a -> (a -> m b) -> m b
withMVarMasked :: MonadUnliftIO m => MVar a -> (a -> m b) -> m b
modifyMVar_ :: MonadUnliftIO m => MVar a -> (a -> m a) -> m ()
modifyMVar :: MonadUnliftIO m => MVar a -> (a -> m (a, b)) -> m b
modifyMVarMasked_ :: MonadUnliftIO m => MVar a -> (a -> m a) -> m ()
modifyMVarMasked :: MonadUnliftIO m => MVar a -> (a -> m (a, b)) -> m b
tryReadMVar :: MonadIO m => MVar a -> m (Maybe a)
mkWeakMVar :: MonadUnliftIO m => MVar a -> m () -> m (Weak (MVar a))

MVar

data MVar a #

An MVar (pronounced "em-var") is a synchronising variable, used for communication between concurrent threads. It can be thought of as a a box, which may be empty or full.

Instances

NFData1 MVar	Since: deepseq-1.4.3.0
Instance details Defined in Control.DeepSeq Methods liftRnf :: (a -> ()) -> MVar a -> () #
Eq (MVar a)	Since: base-4.1.0.0
Instance details Defined in GHC.MVar Methods (==) :: MVar a -> MVar a -> Bool # (/=) :: MVar a -> MVar a -> Bool #
NFData (MVar a)	NOTE: Only strict in the reference and not the referenced value. Since: deepseq-1.4.2.0
Instance details Defined in Control.DeepSeq Methods rnf :: MVar a -> () #
PrimUnlifted (MVar a)	Since: primitive-0.6.4.0
Instance details Defined in Data.Primitive.UnliftedArray Methods toArrayArray# :: MVar a -> ArrayArray# # fromArrayArray# :: ArrayArray# -> MVar a #