39 lines
1.3 KiB
Scheme
39 lines
1.3 KiB
Scheme
(define-module (knots)
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#:use-module (ice-9 suspendable-ports)
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#:use-module (fibers conditions)
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#:export (call-with-default-io-waiters
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wait-when-system-clock-behind
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call-with-sigint))
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(define (call-with-default-io-waiters thunk)
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(parameterize
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((current-read-waiter (@@ (ice-9 suspendable-ports)
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default-read-waiter))
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(current-write-waiter (@@ (ice-9 suspendable-ports)
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default-write-waiter)))
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(thunk)))
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(define (wait-when-system-clock-behind)
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(let ((start-of-the-year-2000 946684800))
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(while (< (current-time)
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start-of-the-year-2000)
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(simple-format (current-error-port)
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"warning: system clock potentially behind, waiting\n")
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(sleep 20))))
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;; Copied from (fibers web server)
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(define (call-with-sigint thunk cvar)
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(let ((handler #f))
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(dynamic-wind
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(lambda ()
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(set! handler
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(sigaction SIGINT (lambda (sig) (signal-condition! cvar)))))
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thunk
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(lambda ()
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(if handler
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;; restore Scheme handler, SIG_IGN or SIG_DFL.
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(sigaction SIGINT (car handler) (cdr handler))
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;; restore original C handler.
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(sigaction SIGINT #f))))))
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