22 lines
936 B
Markdown
22 lines
936 B
Markdown
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# How to schedule one-off or repeating tasks
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(TODO. Not yet implemented: a cron-like program will eventually respond to assertions demanding
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periodic or delayed execution of tasks (likely expressed as assertions, making it more of a
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delayed-or-periodic-assertion-producing program).)
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## Timer tolerances
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Apple has come up with the useful idea of a [timer tolerance][apple-timer-tolerance],
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applicable to both repeating and one-off timers. In [their
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documentation][apple-timer-tolerance], they write:
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> The timer may fire at any time between its scheduled fire date and the scheduled fire date
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> plus the tolerance. [...] A general rule, set the tolerance to at least 10% of the interval
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> [...] Even a small amount of tolerance has significant positive impact on the power usage of
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> your application.
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[apple-timer-tolerance]: https://developer.apple.com/documentation/foundation/timer#1667624
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## One-off tasks
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## Repeating tasks
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