31 lines
1010 B
Racket
31 lines
1010 B
Racket
#lang syndicate
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(provide (struct-out later-than)
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on-timeout
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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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(on-start (send! (set-timer timer-id msecs 'absolute)))
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(on (message (timer-expired timer-id _))
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(react (assert (later-than msecs))))))
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(define-syntax-rule (on-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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(on (message (timer-expired timer-id _)) body ...)))
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(define-syntax-rule (stop-when-timeout relative-msecs body ...)
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(on-timeout relative-msecs (stop-current-facet 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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