22 lines
663 B
Nim
22 lines
663 B
Nim
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## Simple cancellation example
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import chronos
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proc someTask() {.async.} = await sleepAsync(10.minutes)
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proc cancellationExample() {.async.} =
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# Start a task but don't wait for it to finish
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let future = someTask()
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future.cancelSoon()
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# `cancelSoon` schedules but does not wait for the future to get cancelled -
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# it might still be pending here
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let future2 = someTask() # Start another task concurrently
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await future2.cancelAndWait()
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# Using `cancelAndWait`, we can be sure that `future2` is either
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# complete, failed or cancelled at this point. `future` could still be
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# pending!
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assert future2.finished()
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waitFor(cancellationExample())
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