Efficiently run periodic, on-demand actions

Version on this page:
LTS Haskell 11.0:0.1.4
Stackage Nightly 2018-03-17:0.1.4
Latest on Hackage:0.1.4

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MIT licensed by Michael Snoyman
Maintained by

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A common problem is the desire to have an action run at a scheduled interval, but only if it is needed. For example, instead of having every web request result in a new getCurrentTime call, we'd like to have a single worker thread run every second, updating an IORef. However, if the request frequency is less than once per second, this is a pessimization, and worse, kills idle GC.

This library allows you to define actions which will either be performed by a dedicated thread or, in times of low volume, will be executed by the calling thread.

For original use case, see yesod-scaffold issue #15.



  • Provide updateActionModify API in AutoUpdate #547

  • Doc improvements


  • Adding a new AIP - reaperKill


  • Added Control.Debounce
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