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.

this package provides the documentation for a library for the haskell programming language. see http://www.haskell.org/ for more information on haskell.