Control.Concurrent.Chan

Unbounded channels.

The Chan type

data Chan a

Chan is an abstract type representing an unbounded FIFO channel.

Instances

Eq (Chan a)

Typeable (★ → ★) Chan

Operations

newChan ∷ IO (Chan a)

Build and returns a new instance of Chan.

writeChan ∷ Chan a → a → IO ()

Write a value to a Chan.

readChan ∷ Chan a → IO a

Read the next value from the Chan.

dupChan ∷ Chan a → IO (Chan a)

Duplicate a Chan: 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.

(Note that a duplicated channel is not equal to its original. So: fmap (c /=) $ dupChan c returns True for all c.)

unGetChan ∷ Chan a → a → IO ()

Deprecated: if you need this operation, use Control.Concurrent.STM.TChan instead. See http://ghc.haskell.org/trac/ghc/ticket/4154 for details

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

isEmptyChan ∷ Chan a → IO Bool

Deprecated: if you need this operation, use Control.Concurrent.STM.TChan instead. See http://ghc.haskell.org/trac/ghc/ticket/4154 for details

Returns True if the supplied Chan is empty.

Stream interface

getChanContents ∷ Chan a → IO [a]

Return a lazy list representing the contents of the supplied Chan, much like hGetContents.

writeList2Chan ∷ Chan a → [a] → IO ()

Write an entire list of items to a Chan.