软件包：libghc-auto-update-dev（0.1.6-2 以及其他的）

efficiently run periodic, on-demand actions

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 a library for the Haskell programming language. See http://www.haskell.org/ for more information on Haskell.

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