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 Haskell Core Libraries (base package)ParentContentsIndex
Control.Concurrent.Chan
Portability non-portable (concurrency).
Stability experimental
Maintainer libraries@haskell.org
Contents
The Chan type
Operations
Stream interface
Description
Unbounded channels.
Synopsis
data Chan a
newChan :: IO (Chan a)
writeChan :: Chan a -> a -> IO ()
readChan :: Chan a -> IO a
dupChan :: Chan a -> IO (Chan a)
unGetChan :: Chan a -> a -> IO ()
isEmptyChan :: Chan a -> IO Bool
getChanContents :: Chan a -> IO [a]
writeList2Chan :: Chan a -> [a] -> IO ()
The Chan type
data Chan a
Chan is an abstract type representing an unbounded FIFO channel.
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.
unGetChan :: Chan a -> a -> IO ()
Put a data item back onto a channel, where it will be the next item read.
isEmptyChan :: Chan a -> IO Bool
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.
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