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Showing content from http://hackage.haskell.org/packages/archive/base/4.5.0.0/doc/html/Control-Concurrent-Chan.html below:

Control.Concurrent.Chan

Description

Unbounded channels.

data Chan a Source

Chan is an abstract type representing an unbounded FIFO channel.

dupChan :: Chan a -> IO (Chan a)Source

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.)

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