stm-io-hooks-0.5.4: An STM monad with IO hooks Source code Contents Index

Control.Concurrent.AdvSTM.TChan Portability non-portable (requires STM) Stability experimental Maintainer Peter Robinson <robinson@ecs.tuwien.ac.at>

Description

Corresponds to Control.Concurrent.STM.TChan

Synopsis

data TChan a newTChan :: MonadAdvSTM m => m (TChan a) newTChanIO :: IO (TChan a) readTChan :: MonadAdvSTM m => TChan a -> m a writeTChan :: MonadAdvSTM m => TChan a -> a -> m () dupTChan :: MonadAdvSTM m => TChan a -> m (TChan a) unGetTChan :: MonadAdvSTM m => TChan a -> a -> m () isEmptyTChan :: MonadAdvSTM m => TChan a -> m Bool

Documentation

data TChan a Source

TChan is an abstract type representing an unbounded FIFO channel.

newTChan :: MonadAdvSTM m => m (TChan a) Source

Build and returns a new instance of TChan

newTChanIO :: IO (TChan a) Source

IO version of newTChan. This is useful for creating top-level TChans using System.IO.Unsafe.unsafePerformIO, because using atomically inside System.IO.Unsafe.unsafePerformIO isn't possible.

readTChan :: MonadAdvSTM m => TChan a -> m a Source

Read the next value from the TChan.

writeTChan :: MonadAdvSTM m => TChan a -> a -> m () Source

Write a value to a TChan.

dupTChan :: MonadAdvSTM m => TChan a -> m (TChan a) Source

Duplicate a TChan: the duplicate channel begins empty, but data written to either channel from then on will be available from both. Hence this creates a kind of broadcast channel, where data written by anyone is seen by everyone else.

unGetTChan :: MonadAdvSTM m => TChan a -> a -> m () Source

Put a data item back onto a channel, where it will be the next item read.

isEmptyTChan :: MonadAdvSTM m => TChan a -> m Bool Source

Returns True if the supplied TChan is empty.

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