731 lines
26 KiB
Racket
731 lines
26 KiB
Racket
#lang scheme
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(require (only-in mzlib/etc
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identity nor)
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"contract.ss"
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"erl.ss"
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"heap.ss")
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;;;;;;;;;;;;;
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;; Globals ;;
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;;;;;;;;;;;;;
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;; the current logical time step
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(define logical-time (box 0))
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(define (current-logical-time)
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(unbox logical-time))
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(define frtime-inspector (make-inspector))
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(print-struct #t)
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(define snap? (make-parameter #f))
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(define named-dependents (make-hash))
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(define (compose-continuation-mark-sets2 s1 s2)
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s2)
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(define (my-ccm)
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(current-continuation-marks)
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; XXX What is this?
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#;(continuation-mark-set->list (current-continuation-marks) 'drscheme-debug-continuation-mark-key))
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;;;;;;;;;;;;;;;;
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;; Structures ;;
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;;;;;;;;;;;;;;;;
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; also models events, where 'value' is all the events that
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; haven't yet occurred (more specifically, an event-cons cell whose
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; tail is *undefined*)
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(define-struct signal ([value #:mutable]
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[dependents #:mutable]
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[stale? #:mutable]
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[thunk #:mutable]
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[depth #:mutable]
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[continuation-marks #:mutable]
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parameterization
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[producers #:mutable])
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#:inspector frtime-inspector
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#:property prop:procedure
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(lambda (fn . args)
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(unregister #f fn) ; clear out stale dependencies from previous apps
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(let* (; revisit error-reporting for switched behaviors
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[ccm (my-ccm)]
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[app-fun (lambda (cur-fn)
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(let ([res (apply cur-fn args)])
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(when (signal? res)
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(set-signal-continuation-marks! res ccm))
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res))])
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(super-lift app-fun fn))))
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; XXX Remove
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#;(define (signal-custodian sig)
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(call-with-parameterization
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(signal-parameterization sig)
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current-cust))
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(define-struct ft-cust (signal constructed-sigs children) #:mutable)
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(define make-non-scheduled identity)
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(define (non-scheduled? x) #f)
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(define (non-scheduled-signal x)
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(error 'non-scheduled-signal "should never be called"))
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(define current-cust
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(make-parameter #f))
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(define-struct multiple (values)
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#:inspector frtime-inspector)
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(define-struct event-set (time events))
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(define (make-events-now events)
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(make-event-set (current-logical-time) events))
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(define-struct (signal:unchanged signal) ()
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#:inspector frtime-inspector)
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(define-struct (signal:compound signal:unchanged) (content copy)
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#:inspector frtime-inspector)
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(define-struct (signal:switching signal:unchanged) (current trigger)
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#:inspector frtime-inspector)
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(define-struct (signal:event signal) ()
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#:inspector frtime-inspector)
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; an external event; contains a list of pairs
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; (recip val), where val is passed to recip's thunk
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(define-struct external-event (recip-val-pairs))
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; update the given signal at the given time
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(define-struct alarm (time signal))
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(define extra-cont-marks (make-parameter #f))
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(define (effective-continuation-marks)
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(if (extra-cont-marks)
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(begin
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; XXX Remove
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#;(thread (lambda () (raise (make-exn:fail
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"extra marks present!" (extra-cont-marks)))))
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(compose-continuation-mark-sets2
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(my-ccm)
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(extra-cont-marks)
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))
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(my-ccm)))
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;; Simple Structure Combinators
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(define (event-receiver)
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(event-producer2
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(lambda (emit)
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(lambda the-args
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(if (cons? the-args)
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(emit (first the-args))
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(make-events-now empty))))))
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(define (event-producer2 proc . deps)
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(let* ([result (apply proc->signal (lambda args (make-events-now empty)) deps)]
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[proc/emit (proc
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(lambda (val)
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(let ([old-value (signal-value result)])
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(make-events-now
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(if (and (event-set? old-value)
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(= (current-logical-time) (event-set-time old-value)))
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(append (event-set-events old-value) (list val))
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(list val))))))])
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(set-signal-thunk! result proc/emit)
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result))
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(define (build-signal ctor thunk producers)
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(let ([ccm (effective-continuation-marks)])
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(do-in-manager
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(let* ([cust (current-cust)]
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[cust-sig (and cust (ft-cust-signal cust))]
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[sig (ctor
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undefined empty #t thunk
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(add1 (apply max 0 (cons (safe-signal-depth cust-sig) (map safe-signal-depth producers))))
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ccm
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(parameterize ([uncaught-exception-handler
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(lambda (exn) (exn-handler exn))]
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[extra-cont-marks ccm])
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(current-parameterization))
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(if cust-sig (append producers (list cust-sig)) producers))])
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(when (cons? producers)
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(register sig producers))
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(when cust-sig
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(register (make-non-scheduled sig) cust-sig))
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(when cust
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(set-ft-cust-constructed-sigs! cust (cons (make-weak-box sig) (ft-cust-constructed-sigs cust))))
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(iq-enqueue sig)
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sig))))
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(define (proc->signal:switching thunk current-box trigger . producers)
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(let ([ccm (effective-continuation-marks)])
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(do-in-manager
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(let* ([cust (current-cust)]
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[cust-sig (and cust (ft-cust-signal cust))]
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[sig (make-signal:switching
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undefined empty #t thunk
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(add1 (apply max 0 (cons (safe-signal-depth cust-sig) (map safe-signal-depth producers))))
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ccm
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(parameterize ([uncaught-exception-handler
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(lambda (exn) (exn-handler exn))]
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[extra-cont-marks ccm])
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(current-parameterization))
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(if cust-sig (cons cust-sig producers) producers)
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current-box
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trigger)])
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(when (cons? producers)
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(register sig producers))
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(when cust-sig
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(register (make-non-scheduled sig) cust-sig))
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(when cust
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(set-ft-cust-constructed-sigs!
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cust (cons (make-weak-box sig) (ft-cust-constructed-sigs cust))))
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(iq-enqueue sig)
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sig))))
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(define (proc->signal thunk . producers)
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(build-signal make-signal thunk producers))
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; XXX Remove
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#;(define ht (make-hash))
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#;(define (proc->signal/dont-gc-unless other-val thunk . producers)
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(let ([result (build-signal make-signal thunk producers)])
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(hash-set! ht other-val result)
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result))
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(define (proc->signal:unchanged thunk . producers)
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(build-signal make-signal:unchanged thunk producers))
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;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Simple Signal Tools ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;
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(define (send-event rcvr val)
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(! man (make-external-event (list (list rcvr val)))))
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; XXX move man check into contract
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(define (send-synchronous-event rcvr val)
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(when (man?)
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(error 'send-synchronous-event "already in frtime engine (would deadlock)"))
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(! man (make-external-event (list (list rcvr val))))
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(do-in-manager '()))
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; XXX move man check into contract
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(define (send-synchronous-events rcvr-val-pairs)
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(when (man?)
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(error 'send-synchronous-events "already in frtime engine (would deadlock)"))
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(! man (make-external-event rcvr-val-pairs))
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(do-in-manager '()))
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; set-cell! : cell[a] a -> void
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(define (set-cell! ref beh)
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(if (man?)
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(iq-enqueue (list ((signal-thunk ref) #t) beh))
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(! man (make-external-event (list (list ((signal-thunk ref) #t) beh))))))
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(define-values (undefined undefined?)
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(let ()
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(define-struct undefined ()
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#:inspector frtime-inspector
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#:property prop:procedure (lambda (fn . args) fn))
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(values (make-undefined) undefined?)))
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(define (behavior? v)
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(and (signal? v) (not (event-set? (signal-value v)))))
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(define (undef b)
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(match b
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[(and (? signal?)
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(app signal-value value))
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(set-signal-stale?! b #f)
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(when (not (undefined? value))
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(set-signal-value! b undefined)
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(propagate b))]
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[_ (void)]))
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(define (multiple->values v)
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(if (multiple? v)
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(apply values (multiple-values v))
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v))
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(define (values->multiple proc)
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(call-with-values
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proc
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(case-lambda
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[(v) v]
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[vals (make-multiple vals)])))
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; value-now : signal[a] -> a
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(define (value-now val)
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;(multiple->values
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(cond
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[(signal:compound? val) ((signal:compound-copy val))]
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[(signal:switching? val) (value-now (unbox (signal:switching-current val)))]
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[(signal? val) (signal-value val)]
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[else val]));)
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(define (value-now/no-copy val)
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;(multiple->values
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(cond
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[(signal:switching? val) (value-now/no-copy (unbox (signal:switching-current val)))]
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[(signal? val) (signal-value val)]
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[else val]));)
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;; given a list, will return a list of their value-nows that will agree
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(define (value-now/sync . sigs)
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(do-in-manager-after
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(apply values (map value-now sigs))))
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(define (kill-signal sig)
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(for-each
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(lambda (prod)
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(unregister sig prod))
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(signal-producers sig))
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(set-signal-thunk! sig (lambda _ 'really-dead))
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(set-signal-value! sig 'dead)
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(set-signal-dependents! sig empty)
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(set-signal-producers! sig empty))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Dataflow Graph Maintenance ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define (safe-signal-depth v)
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(cond
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[(signal? v) (signal-depth v)]
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[(non-scheduled? v) (signal-depth (non-scheduled-signal v))]
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[else 0]))
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(define fix-depths
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(lambda (inf sup [mem empty])
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(if (memq sup mem)
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(send-event exceptions (list (make-exn:fail "tight cycle in dataflow graph" (signal-continuation-marks sup))
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sup))
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(when (<= (safe-signal-depth inf)
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(safe-signal-depth sup))
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(set-signal-depth! inf (add1 (safe-signal-depth sup)))
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(for-each
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(lambda (dep) (fix-depths dep inf (cons sup mem)))
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(foldl (lambda (wb acc)
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(match (weak-box-value wb)
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[(and sig (? signal?)) (cons sig acc)]
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[(and (? non-scheduled?) (app non-scheduled-signal sig)) (cons sig acc)]
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[_ acc]))
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empty (signal-dependents inf)))))))
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(define-values (iq-enqueue iq-dequeue iq-empty? iq-resort)
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(let* ([depth
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(lambda (msg)
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(let ([msg (if (weak-box? msg) (weak-box-value msg) msg)])
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(cond
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[(cons? msg) (signal-depth (first msg))]
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[(signal? msg) (signal-depth msg)]
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[else 0])))]
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[heap (make-heap
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(lambda (b1 b2) (< (depth b1) (depth b2)))
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eq?)])
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(values
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(lambda (b) (heap-insert heap b))
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(lambda () (let ([v (heap-pop heap)])
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(if (weak-box? v)
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(weak-box-value v)
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v)))
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(lambda () (heap-empty? heap))
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(lambda () (let loop ([elts empty])
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(if (heap-empty? heap)
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(let loop ([elts elts])
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(when (cons? elts)
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(heap-insert heap (first elts))
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(loop (rest elts))))
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(loop (cons (heap-pop heap) elts))))))))
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(define-values (alarms-enqueue alarms-dequeue-beh alarms-peak-ms alarms-empty?)
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(let ([heap (make-heap (lambda (a b) (< (first a) (first b))) eq?)])
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(values (lambda (ms beh) (heap-insert heap (list ms (make-weak-box beh))))
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(lambda () (match (heap-pop heap) [(list _ beh) (weak-box-value beh)]))
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(lambda () (match (heap-peak heap) [(list ms _) ms]))
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(lambda () (heap-empty? heap)))))
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(define (schedule-alarm ms beh)
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(if (eq? (self) man)
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(alarms-enqueue ms beh)
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(! man (make-alarm ms beh))))
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;;;;;;;;;;;;;;;;;;;;;
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;; Manager Helpers ;;
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;;;;;;;;;;;;;;;;;;;;;
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(define man?
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(lambda ([v (self)])
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(eq? v man)))
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(define-syntax do-in-manager
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(syntax-rules ()
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[(_ expr ...)
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(if (man?)
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(begin expr ...)
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(begin
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(! man (list 'run-thunk (self)
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(let ([params (current-parameterization)])
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(lambda ()
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(call-with-parameterization
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params
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(lambda () expr ...))))))
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(receive [(list-rest 'vals vs) (apply values vs)]
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[(list 'exn e) (raise e)])))]))
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(define-syntax do-in-manager-after
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(syntax-rules ()
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[(_ expr ...)
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(if (man?)
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(begin expr ...)
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(begin
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(! man (list 'run-thunk/stabilized (self)
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(let ([params (current-parameterization)])
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(lambda ()
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(call-with-parameterization
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params
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(lambda () expr ...))))))
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(receive [(list-rest 'vals vs) (apply values vs)]
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[(list 'exn e) (raise e)])))]))
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(define (register inf sup)
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(do-in-manager
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(match sup
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[(and (? signal?)
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(app signal-dependents dependents))
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(set-signal-dependents!
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sup
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(cons (make-weak-box inf) dependents))
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(fix-depths inf sup)]
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[(? list?) (for-each (lambda (sup1) (register inf sup1)) sup)]
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[_ (void)])
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inf))
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(define (unregister inf sup)
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(do-in-manager
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(match sup
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[(and (? signal?)
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(app signal-dependents dependents))
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(set-signal-dependents!
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sup
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(filter (lambda (a)
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(let ([v (weak-box-value a)])
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(nor (eq? v inf)
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(eq? v #f))))
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dependents))]
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[_ (void)])))
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(define (cust-killall! cust)
|
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(let loop ([sigs (ft-cust-constructed-sigs cust)])
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(when (cons? sigs)
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(cond
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[(weak-box-value (first sigs)) => kill-signal]
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[else (void)])
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(loop (rest sigs))))
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(for-each cust-killall! (ft-cust-children cust)))
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(define (super-lift fun bhvr)
|
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(if (behavior? bhvr)
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(parameterize ([extra-cont-marks
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(effective-continuation-marks)])
|
|
(do-in-manager
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|
(let* ([cust (make-ft-cust (void) empty empty)]
|
|
[_ (cond
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|
[(current-cust)
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|
=> (lambda (c) (set-ft-cust-children! c (cons cust (ft-cust-children c))))]
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|
[else (void)])]
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|
[pfun (lambda (b)
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(parameterize ([current-cust cust])
|
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(fun b)))]
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[current (box undefined)])
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|
(letrec ([custodian-signal
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|
(proc->signal:unchanged
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|
(lambda ()
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(cust-killall! cust)
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(set-ft-cust-constructed-sigs! cust empty)
|
|
(set-ft-cust-children! cust empty)
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|
(unregister rtn (unbox current))
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(set-box! current (pfun (value-now/no-copy bhvr)))
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(register rtn (unbox current))
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;; keep rtn's producers up-to-date
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(set-signal-producers! rtn (cons (unbox current)
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(cdr (signal-producers rtn))))
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(iq-resort)
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|
'custodian)
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|
bhvr)]
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[rtn (proc->signal:switching
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(lambda () custodian-signal (value-now/no-copy (unbox current)))
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|
current custodian-signal undefined bhvr custodian-signal)])
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|
(set-ft-cust-signal! cust custodian-signal)
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|
rtn))))
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|
(fun bhvr)))
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|
|
(define (propagate b)
|
|
(let ([empty-boxes 0]
|
|
[dependents (signal-dependents b)]
|
|
[depth (signal-depth b)])
|
|
(for-each
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|
(lambda (wb)
|
|
(match (weak-box-value wb)
|
|
[(and dep (? signal?) (app signal-stale? #f))
|
|
(set-signal-stale?! dep #t)
|
|
; If I'm crossing a "back" edge (one potentially causing a cycle),
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|
; then I send a message. Otherwise, I add to the internal
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|
; priority queue.
|
|
(if (< depth (signal-depth dep))
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|
(iq-enqueue wb)
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|
(! man dep))]
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|
[_
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(set! empty-boxes (add1 empty-boxes))]))
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dependents)
|
|
(when (> empty-boxes 9)
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|
(set-signal-dependents!
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|
b
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(filter weak-box-value dependents)))))
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|
|
|
(define (update0 b)
|
|
(match b
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|
[(and (? signal?)
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|
(app signal-value value)
|
|
(app signal-thunk thunk)
|
|
(app signal-parameterization params))
|
|
(set-signal-stale?! b #f)
|
|
(let ([new-value (call-with-parameterization
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|
params
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|
thunk)])
|
|
(when (or (signal:unchanged? b)
|
|
(and (not (eq? value new-value))
|
|
(or (not (event-set? new-value)) (cons? (event-set-events new-value))
|
|
(not (event-set? value)))))
|
|
(begin
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(set-signal-value! b new-value)
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|
(propagate b))))]
|
|
[_ (void)]))
|
|
|
|
(define (update1 b a)
|
|
(match b
|
|
[(and (? signal?)
|
|
(app signal-value value)
|
|
(app signal-thunk thunk))
|
|
(set-signal-stale?! b #f)
|
|
(let ([new-value (thunk a)])
|
|
(when (not (equal? value new-value))
|
|
(set-signal-value! b new-value)
|
|
(propagate b)))]
|
|
[_ (void)]))
|
|
|
|
(define (signal-count)
|
|
(! man `(stat ,(self)))
|
|
(receive [n n]))
|
|
|
|
(define (hash-table-size ht)
|
|
(let ([x 0])
|
|
(hash-for-each ht (lambda (k v)
|
|
(when k (set! x (add1 x)))))
|
|
x))
|
|
|
|
(define exn-handler (lambda (exn) (raise exn)))
|
|
|
|
;;;;;;;;;;;;;
|
|
;; Manager ;;
|
|
;;;;;;;;;;;;;
|
|
|
|
;; the manager of all signals
|
|
(define man
|
|
(spawn/name
|
|
'frtime-heart
|
|
(let* ([named-providers (make-hash)]
|
|
[cur-beh #f]
|
|
[signal-cache (make-weak-hash)]
|
|
[last-known-signal-count 50]
|
|
[notifications empty]
|
|
|
|
;; added for run-thunk/stablized
|
|
[thunks-to-run empty]
|
|
[do-and-queue (lambda (pid thnk)
|
|
(with-handlers
|
|
([exn:fail? (lambda (exn)
|
|
(set! notifications
|
|
(cons (list pid 'exn exn)
|
|
notifications)))])
|
|
(set! notifications
|
|
(cons (list* pid 'vals (call-with-values thnk list))
|
|
notifications))))])
|
|
(let outer ()
|
|
(with-handlers ([exn:fail?
|
|
(lambda (exn)
|
|
(when cur-beh
|
|
(set! exn (make-exn:fail
|
|
(exn-message exn)
|
|
(compose-continuation-mark-sets2
|
|
(signal-continuation-marks
|
|
cur-beh)
|
|
(exn-continuation-marks exn))));)
|
|
(iq-enqueue (list exceptions (list exn cur-beh)))
|
|
(when (behavior? cur-beh)
|
|
(undef cur-beh)))
|
|
(outer))])
|
|
(set! exn-handler (uncaught-exception-handler))
|
|
(let inner ()
|
|
|
|
;; process external messages until there is an internal update
|
|
;; or an expired alarm
|
|
(let loop ()
|
|
(receive [after (cond
|
|
[(not (iq-empty?)) 0]
|
|
[(not (alarms-empty?)) (- (alarms-peak-ms)
|
|
(current-inexact-milliseconds))]
|
|
[else #f])
|
|
(void)]
|
|
[(? signal? b)
|
|
(iq-enqueue b)
|
|
(loop)]
|
|
[(struct external-event (recip-val-pairs))
|
|
(for-each iq-enqueue recip-val-pairs)
|
|
(loop)]
|
|
[(struct alarm (ms beh))
|
|
(schedule-alarm ms beh)
|
|
(loop)]
|
|
[(list 'run-thunk rtn-pid thunk)
|
|
(begin
|
|
(do-and-queue rtn-pid thunk)
|
|
(loop))]
|
|
|
|
;; !Experimental!
|
|
;; queues thunks to be evaluated after this round of computation,
|
|
;; but before the next round
|
|
|
|
[(list 'run-thunk/stabilized rtn-pid thunk)
|
|
(begin
|
|
(set! thunks-to-run (cons (list rtn-pid thunk) thunks-to-run))
|
|
(loop))]
|
|
|
|
[(list 'stat rtn-pid)
|
|
(! rtn-pid (hash-table-size signal-cache))]
|
|
|
|
[(list 'remote-reg tid sym)
|
|
(let ([f+l (hash-ref named-providers sym)])
|
|
(when (not (member tid (mcdr f+l)))
|
|
(set-mcdr! f+l (cons tid (mcdr f+l)))))
|
|
(loop)]
|
|
[(list 'remote-evt sym val)
|
|
(iq-enqueue
|
|
(list (hash-ref named-dependents sym (lambda () dummy)) val))
|
|
(loop)]
|
|
[msg
|
|
(fprintf (current-error-port)
|
|
"frtime engine: msg not understood: ~a\n"
|
|
msg)
|
|
(loop)]))
|
|
|
|
;; enqueue expired timers for execution
|
|
(let loop ()
|
|
(unless (or (alarms-empty?)
|
|
(< (current-inexact-milliseconds)
|
|
(alarms-peak-ms)))
|
|
(let ([beh (alarms-dequeue-beh)])
|
|
(when (and beh (not (signal-stale? beh)))
|
|
(set-signal-stale?! beh #t)
|
|
(iq-enqueue beh)))
|
|
(loop)))
|
|
|
|
;; process internal updates
|
|
(let loop ()
|
|
(unless (iq-empty?)
|
|
(match (iq-dequeue)
|
|
[(list b val)
|
|
(set! cur-beh b)
|
|
(update1 b val)
|
|
(set! cur-beh #f)]
|
|
[b
|
|
(set! cur-beh b)
|
|
(update0 b)
|
|
(hash-ref signal-cache b (lambda () (hash-set! signal-cache b #t)))
|
|
(set! cur-beh #f)])
|
|
(loop)))
|
|
|
|
;; do the run-thunk/stabalized; use existing notification mechanism
|
|
(for-each (lambda (pair)
|
|
(do-and-queue (first pair) (second pair)))
|
|
thunks-to-run)
|
|
|
|
|
|
(for-each (lambda (lst)
|
|
(! (first lst) (rest lst)))
|
|
notifications)
|
|
|
|
(set! notifications empty)
|
|
(set! thunks-to-run empty)
|
|
|
|
(set-box! logical-time (add1 (unbox logical-time)))
|
|
|
|
(inner)))))))
|
|
|
|
(define exceptions (event-receiver))
|
|
|
|
(define dummy (proc->signal void))
|
|
|
|
(provide do-in-manager
|
|
do-in-manager-after)
|
|
|
|
(define thunk/c
|
|
(unconstrained-domain-> any/c)) ; XXX Not really thunk
|
|
(define producers/c
|
|
(listof any/c)) ; XXX bad
|
|
(define switching-current/c
|
|
(box/c any/c)) ; XXX
|
|
(define switching-trigger/c
|
|
any/c)
|
|
|
|
(provide/contract*
|
|
; Event Sets
|
|
[make-events-now ((listof any/c) . -> . event-set?)] ; XXX Ugly contract
|
|
[event-set? (any/c . -> . boolean?)]
|
|
[event-set-time (event-set? . -> . number?)]
|
|
[event-set-events (event-set? . -> . (listof any/c))] ; XXX Ugly contract
|
|
; Undefined
|
|
[undefined undefined?]
|
|
[undefined? (any/c . -> . boolean?)]
|
|
; Signals
|
|
[proc->signal ((thunk/c) () #:rest producers/c . ->* . signal?)]
|
|
[signal? (any/c . -> . boolean?)]
|
|
[signal-value (signal? . -> . any/c)]
|
|
[set-signal-value! (signal? any/c . -> . void)]
|
|
[signal-depth (signal? . -> . exact-nonnegative-integer?)]
|
|
[set-signal-depth! (signal? exact-nonnegative-integer? . -> . void)]
|
|
[set-signal-producers! (signal? producers/c . -> . void)]
|
|
[signal-thunk (signal? . -> . thunk/c)]
|
|
[set-signal-thunk! (signal? thunk/c . -> . void)]
|
|
[signal-count (-> exact-nonnegative-integer?)]
|
|
; Signal : Compound
|
|
[signal:compound? (any/c . -> . boolean?)]
|
|
[signal:compound-content (signal:compound? . -> . cons?)] ; XXX Ugly contract on codomain
|
|
; Signal : Switching
|
|
[proc->signal:switching ((thunk/c switching-current/c switching-trigger/c) () #:rest producers/c . ->* . signal:switching?)]
|
|
[signal:switching? (any/c . -> . boolean?)]
|
|
[signal:switching-current (signal:switching? . -> . switching-current/c)]
|
|
[signal:switching-trigger (signal:switching? . -> . switching-trigger/c)]
|
|
; Input queue
|
|
[iq-enqueue (any/c . -> . void)] ; XXX Not sure what any/c should be
|
|
[iq-resort (-> void)]
|
|
; Events
|
|
[send-event (signal? any/c . -> . void)]
|
|
[send-synchronous-event (signal? any/c . -> . void)]
|
|
[send-synchronous-events ((listof (cons/c signal? (listof any/c))) . -> . void)]
|
|
[event-receiver (-> signal?)]
|
|
[event-producer2 ((thunk/c) () #:rest producers/c . ->* . signal?)]
|
|
; Other
|
|
[register (signal? any/c . -> . void)] ; XXX Ugly contract
|
|
[unregister (signal? any/c . -> . void)] ; XXX Ugly contract
|
|
[current-logical-time (-> exact-nonnegative-integer?)]
|
|
[snap? (parameter/c boolean?)]
|
|
[super-lift ((any/c . -> . any/c) any/c . -> . any/c)] ; XXX Ugly contract
|
|
[behavior? (any/c . -> . boolean?)]
|
|
[value-now (any/c . -> . any/c)] ; XXX Should this return (not/c signal?) and why not take signal?
|
|
[value-now/sync (() () #:rest (listof any/c) . ->* . any)] ; XXX See above + not matching number of values returned with number of signals
|
|
[value-now/no-copy (any/c . -> . any/c)] ; XXX Should this return (not/c signal?) and why not take signal?
|
|
[safe-signal-depth (any/c . -> . exact-nonnegative-integer?)] ; XXX Ugly contract
|
|
[schedule-alarm (number? signal? . -> . void)]
|
|
[set-cell! (signal? any/c . -> . void)] ; XXX What is any/c?
|
|
[exceptions signal?])
|