28 lines
929 B
Racket
28 lines
929 B
Racket
#lang syndicate
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(provide (struct-out later-than)
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stop-when-timeout
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sleep)
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(require/activate syndicate/drivers/timer)
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(struct later-than (msecs) #:prefab)
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(spawn #:name 'drivers/timestate
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(during (observe (later-than $msecs))
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(define timer-id (gensym 'timestate))
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(field [expired? #f])
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(on-start (send! (set-timer timer-id msecs 'absolute)))
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(on (message (timer-expired timer-id _)) (expired? #t))
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(assert #:when (expired?) (later-than msecs))))
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(define-syntax-rule (stop-when-timeout relative-msecs body ...)
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(let ((timer-id (gensym 'timeout)))
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(on-start (send! (set-timer timer-id relative-msecs 'relative)))
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(stop-when (message (timer-expired timer-id _)) body ...)))
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(define (sleep sec)
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(define timer-id (gensym 'sleep))
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(until (message (timer-expired timer-id _))
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(on-start (send! (set-timer timer-id (* sec 1000.0) 'relative)))))
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