@hackage / fixed-timestep

Pure Haskell library to repeat an action at a specific frequency.

Latest0.2.0.1

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  • Last updated , by Solonarv
  • License MIT

  • Maintained by: Nicolas Stamm <nstamm@gmx.de>

  • Lottery factor: 0

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fixed-timestep

Pure Haskell library to run an action repeatedly, a specific amount of times per second.

Internal timekeeping is done in flicks, a unit of time equal to precisely 1/705600000 of a second.

Basic usage:

λ> import Data.Time.Clock

λ> import Time.Repeatedly

λ> repeatedly 1 (print =<< getCurrentTime)

2019-03-13 21:14:36.826248 UTC

2019-03-13 21:14:37.8282926 UTC

2019-03-13 21:14:38.8327692 UTC

2019-03-13 21:14:39.8359494 UTC

2019-03-13 21:14:40.8374415 UTC

^CInterrupted.

Using async, you can repeat multiple actions independently, and also cancel them:

λ> import Data.Time.Clock

λ> import Control.Concurrent.Asyncx

λ> import Time.Repeatedly

λ> printer <- asyncRepeatedly 1 (print =<< getCurrentTime)

2019-03-13 21:21:27.5228834 UTC

2019-03-13 21:21:28.523892 UTC

2019-03-13 21:21:29.5283634 UTC

2019-03-13 21:21:30.5313565 UTC

2019-03-13 21:21:31.535904 UTC

2019-03-13 21:21:32.5373828 UTC

2019-03-13 21:21:33.5393834 UTC

2019-03-13 21:21:34.5408811 UTC

cancel printer