Safe Haskell	None
Language	Haskell98

Control.Monad.Par.IO

Description

This module is an alternative version of Control.Monad.Par in which the Par type provides IO operations, by means of liftIO. The price paid is that only runParIO is available, not the pure runPar.

This module uses the same default scheduler as Control.Monad.Par.

Synopsis

data ParIO a
data IVar a
runParIO :: ParIO a -> IO a

Documentation

data ParIO a #

A wrapper around an underlying Par type which allows IO.

Instances

Monad ParIO #
Instance details Defined in Control.Monad.Par.IO Methods (>>=) :: ParIO a -> (a -> ParIO b) -> ParIO b # (>>) :: ParIO a -> ParIO b -> ParIO b # return :: a -> ParIO a # fail :: String -> ParIO a #
Functor ParIO #
Instance details Defined in Control.Monad.Par.IO Methods fmap :: (a -> b) -> ParIO a -> ParIO b # (<$) :: a -> ParIO b -> ParIO a #
Applicative ParIO #
Instance details Defined in Control.Monad.Par.IO Methods pure :: a -> ParIO a # (<>) :: ParIO (a -> b) -> ParIO a -> ParIO b # liftA2 :: (a -> b -> c) -> ParIO a -> ParIO b -> ParIO c # (>) :: ParIO a -> ParIO b -> ParIO b # (<*) :: ParIO a -> ParIO b -> ParIO a #
MonadIO ParIO #
Instance details Defined in Control.Monad.Par.IO Methods liftIO :: IO a -> ParIO a #
ParFuture IVar ParIO #
Instance details Defined in Control.Monad.Par.IO Methods spawn :: NFData a => ParIO a -> ParIO (IVar a) # spawn_ :: ParIO a -> ParIO (IVar a) # get :: IVar a -> ParIO a # spawnP :: NFData a => a -> ParIO (IVar a) #
ParIVar IVar ParIO #
Instance details Defined in Control.Monad.Par.IO Methods fork :: ParIO () -> ParIO () # new :: ParIO (IVar a) # put :: NFData a => IVar a -> a -> ParIO () # put_ :: IVar a -> a -> ParIO () # newFull :: NFData a => a -> ParIO (IVar a) # newFull_ :: a -> ParIO (IVar a) #

data IVar a #

Instances

ParFuture IVar Par #
Instance details Defined in Control.Monad.Par.Scheds.Trace Methods spawn :: NFData a => Par a -> Par (IVar a) # spawn_ :: Par a -> Par (IVar a) # get :: IVar a -> Par a # spawnP :: NFData a => a -> Par (IVar a) #
ParFuture IVar ParIO #
Instance details Defined in Control.Monad.Par.IO Methods spawn :: NFData a => ParIO a -> ParIO (IVar a) # spawn_ :: ParIO a -> ParIO (IVar a) # get :: IVar a -> ParIO a # spawnP :: NFData a => a -> ParIO (IVar a) #
ParIVar IVar Par #
Instance details Defined in Control.Monad.Par.Scheds.Trace Methods fork :: Par () -> Par () # new :: Par (IVar a) # put :: NFData a => IVar a -> a -> Par () # put_ :: IVar a -> a -> Par () # newFull :: NFData a => a -> Par (IVar a) # newFull_ :: a -> Par (IVar a) #
ParIVar IVar ParIO #
Instance details Defined in Control.Monad.Par.IO Methods fork :: ParIO () -> ParIO () # new :: ParIO (IVar a) # put :: NFData a => IVar a -> a -> ParIO () # put_ :: IVar a -> a -> ParIO () # newFull :: NFData a => a -> ParIO (IVar a) # newFull_ :: a -> ParIO (IVar a) #
Eq (IVar a) #	Equality for IVars is physical equality, as with other reference types.
Instance details Defined in Control.Monad.Par.Scheds.TraceInternal Methods (==) :: IVar a -> IVar a -> Bool # (/=) :: IVar a -> IVar a -> Bool #
NFData (IVar a) #
Instance details Defined in Control.Monad.Par.Scheds.TraceInternal Methods rnf :: IVar a -> () #

runParIO :: ParIO a -> IO a #

A run method which allows actual IO to occur on top of the Par monad. Of course this means that all the normal problems of parallel IO computations are present, including nondeterminsm.

A simple example program:

 runParIO (liftIO $ putStrLn "hi" :: ParIO ())