ghc-broadcast-chan

Broadcast channel type that avoids 0 reader space leaks

A variation of "Control.Concurrent.Chan" from base, which allows to the easy creation of broadcast channels without the space-leaks that may arise from using 'Control.Concurrent.Chan.dupChan'. The 'Control.Concurrent.Chan.Chan' type from "Control.Concurrent.Chan" consists of both a read and write end. This presents a problem when one wants to have a broadcast channel that, at times, has zero listeners. To write to a 'Control.Concurrent.Chan.Chan' there must always be a read end and this read end will hold ALL messages alive until read. The simple solution applied in this module is to separate read and write ends. As a result, any messages written to the write end can be immediately garbage collected if there are no active read ends, avoding space leaks.

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