Efficiently run periodic, on-demand actions

Version on this page:
LTS Haskell 22.22:0.1.6
Stackage Nightly 2024-05-21:0.1.6
Latest on Hackage:0.2.0

See all snapshots auto-update appears in

MIT licensed by Michael Snoyman
Maintained by [email protected]
This version can be pinned in stack with:auto-update-,1219

Module documentation for

  • Control
    • Control.AutoUpdate
    • Control.Debounce
    • Control.Reaper
Depends on 1 package(full list with versions):


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 1getCurrentTime1 call, we’d like to have a single worker thread run every second, updating an 1IORef1. 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.


0.1.2 Added Control.Debounce