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> Haskell Core Libraries (base package) Parent Contents Index 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. Produced by Haddock version 0.4