Safe Haskell	None

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, and tasks scheduled by the two can share the same pool of worker threads.

Synopsis

Documentation

data ParIO a

A wrapper around an underlying Par type which allows IO.

Instances

Monad ParIO
Functor ParIO
Applicative ParIO
MonadIO ParIO
ParFuture IVar ParIO
ParIVar IVar ParIO

data IVar a

Instances

ParFuture IVar Par
ParFuture IVar ParIO
ParIVar IVar Par
ParIVar IVar ParIO
ParUnsafe IVar Par
NFData (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 ())