stm-chans

Additional types of channels for STM.

https://wrengr.org/software/hackage.html

LTS Haskell 24.24:3.0.0.9
Stackage Nightly 2025-12-16:3.0.0.9
Latest on Hackage:3.0.0.9

See all snapshots stm-chans appears in

BSD-3-Clause licensed by wren gayle romano, Thomas DuBuisson
Maintained by [email protected]
This version can be pinned in stack with:stm-chans-3.0.0.9@sha256:b2d4b54b2859da7a002819165fae0b051582036af7c313c23e9e0d28562e1938,2591

Module documentation for 3.0.0.9

  • Control
    • Control.Concurrent
      • Control.Concurrent.STM
        • Control.Concurrent.STM.TBChan
        • Control.Concurrent.STM.TBMChan
        • Control.Concurrent.STM.TBMQueue
        • Control.Concurrent.STM.TMChan
        • Control.Concurrent.STM.TMQueue
Depends on 2 packages(full list with versions):
base, stm

stm-chans

Hackage version Build Status Dependencies

This package offers a collection of channel types, similar to Control.Concurrent.STM.{TChan,TQueue} but with additional features. In particular we offer the following data types:

  • Control.Concurrent.STM.TBChan: Bounded FIFO channels. When the channel is full, writers will block/retry. This ensures that the writers do not get too far ahead of the readers, which helps to make sure that memory and cpu resources are used responsibly.
  • Control.Concurrent.STM.TMChan: Closeable FIFO channels.
  • Control.Concurrent.STM.TMQueue: Closeable FIFO queues. Like TChan (Maybe a) but with a monotonicity guarantee that once Nothing is returned all future reads will be Nothing as well.
  • Control.Concurrent.STM.TBMChan: Bounded Closeable FIFO channels.
  • Control.Concurrent.STM.TBMQueue: Bounded Closeable FIFO queues. Combines the capabilities of TBChan and TMChan.

Install

In general, this is a simple package and should be easy to install. It does require GHC however, because it relies on the Control.Concurrent.STM.TChan type which (for some unknown reason) is GHC-only. With the cabal-install program you can just do:

$> cabal install stm-chans

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