Safe Haskell	Safe
Language	Haskell2010

Relude.Lifted.Concurrent

Contents

MVar
STM

Description

Concurrency useful and common functions.

Synopsis

data MVar a
newEmptyMVar :: MonadIO m => m (MVar a)
newMVar :: MonadIO m => a -> m (MVar a)
putMVar :: MonadIO m => MVar a -> a -> m ()
readMVar :: MonadIO m => MVar a -> m a
swapMVar :: MonadIO m => MVar a -> a -> m a
takeMVar :: MonadIO m => MVar a -> m a
tryPutMVar :: MonadIO m => MVar a -> a -> m Bool
tryReadMVar :: MonadIO m => MVar a -> m (Maybe a)
tryTakeMVar :: MonadIO m => MVar a -> m (Maybe a)
data STM a
data TVar a
atomically :: MonadIO m => STM a -> m a
newTVarIO :: MonadIO m => a -> m (TVar a)
readTVarIO :: MonadIO m => TVar a -> m a
modifyTVar' :: TVar a -> (a -> a) -> STM ()
newTVar :: a -> STM (TVar a)
readTVar :: TVar a -> STM a
writeTVar :: TVar a -> a -> STM ()

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 -> () #

newEmptyMVar :: MonadIO m => m (MVar a) Source #

Lifted to MonadIO version of newEmptyMVar.

newMVar :: MonadIO m => a -> m (MVar a) Source #

Lifted to MonadIO version of newMVar.

putMVar :: MonadIO m => MVar a -> a -> m () Source #

Lifted to MonadIO version of putMVar.

readMVar :: MonadIO m => MVar a -> m a Source #

Lifted to MonadIO version of readMVar.

swapMVar :: MonadIO m => MVar a -> a -> m a Source #

Lifted to MonadIO version of swapMVar.

takeMVar :: MonadIO m => MVar a -> m a Source #

Lifted to MonadIO version of takeMVar.

tryPutMVar :: MonadIO m => MVar a -> a -> m Bool Source #

Lifted to MonadIO version of tryPutMVar.

tryReadMVar :: MonadIO m => MVar a -> m (Maybe a) Source #

Lifted to MonadIO version of tryReadMVar.

tryTakeMVar :: MonadIO m => MVar a -> m (Maybe a) Source #

Lifted to MonadIO version of tryTakeMVar.

STM

data STM a #

A monad supporting atomic memory transactions.

Instances

Monad STM	Since: base-4.3.0.0
Instance details Defined in GHC.Conc.Sync Methods (>>=) :: STM a -> (a -> STM b) -> STM b # (>>) :: STM a -> STM b -> STM b # return :: a -> STM a # fail :: String -> STM a #
Functor STM	Since: base-4.3.0.0
Instance details Defined in GHC.Conc.Sync Methods fmap :: (a -> b) -> STM a -> STM b # (<$) :: a -> STM b -> STM a #
Applicative STM	Since: base-4.8.0.0
Instance details Defined in GHC.Conc.Sync Methods pure :: a -> STM a # (<>) :: STM (a -> b) -> STM a -> STM b # liftA2 :: (a -> b -> c) -> STM a -> STM b -> STM c # (>) :: STM a -> STM b -> STM b # (<*) :: STM a -> STM b -> STM a #
Alternative STM	Since: base-4.8.0.0
Instance details Defined in GHC.Conc.Sync Methods empty :: STM a # (<\|>) :: STM a -> STM a -> STM a # some :: STM a -> STM [a] # many :: STM a -> STM [a] #
MonadPlus STM	Since: base-4.3.0.0
Instance details Defined in GHC.Conc.Sync Methods mzero :: STM a # mplus :: STM a -> STM a -> STM a #

data TVar a #

Shared memory locations that support atomic memory transactions.

Instances

Eq (TVar a)	Since: base-4.8.0.0
Instance details Defined in GHC.Conc.Sync Methods (==) :: TVar a -> TVar a -> Bool # (/=) :: TVar a -> TVar a -> Bool #

atomically :: MonadIO m => STM a -> m a Source #

Lifted to MonadIO version of atomically.

newTVarIO :: MonadIO m => a -> m (TVar a) Source #

Lifted to MonadIO version of newTVarIO.

readTVarIO :: MonadIO m => TVar a -> m a Source #

Lifted to MonadIO version of readTVarIO.

modifyTVar' :: TVar a -> (a -> a) -> STM () #

Strict version of modifyTVar.

Since: stm-2.3

newTVar :: a -> STM (TVar a) #

Create a new TVar holding a value supplied

readTVar :: TVar a -> STM a #

Return the current value stored in a TVar.

writeTVar :: TVar a -> a -> STM () #

Write the supplied value into a TVar.