X-Git-Url: https://jxself.org/git/?a=blobdiff_plain;f=loopy.scm;h=2f733c01d4fe32afa21641bc456c37efc4f0f171;hb=35a90099f27585e853a8b8aee498c5228d8f9697;hp=96d6a9044a1138ad622aade1c71887638c1639d5;hpb=4cd7520679450b5e85307f7ae1c7c15319a0894f;p=8sync.git diff --git a/loopy.scm b/loopy.scm index 96d6a90..2f733c0 100644 --- a/loopy.scm +++ b/loopy.scm @@ -3,27 +3,42 @@ #:use-module (srfi srfi-9 gnu) #:use-module (ice-9 q) #:use-module (ice-9 match) - #:export (make-agenda - agenda? + #:use-module (ice-9 receive) + #:export ( + make-agenda agenda? agenda-queue agenda-prompt-tag agenda-port-pmapping agenda-schedule make-async-prompt-tag - make-time-segment - time-segment? + + make-time-segment time-segment? time-segment-time time-segment-queue - time-< time-= time-<= + time-< time-= time-<= time-+ - make-schedule + + make-time-delta time-delta? + time-delta-sec time-delta-usec + + + make-schedule schedule? schedule-add! schedule-empty? schedule-segments + schedule-segments-split schedule-extract-until! + add-segments-contents-to-queue! + make-port-mapping port-mapping-set! port-mapping-remove! port-mapping-empty? port-mapping-non-empty? + + make-run-request run-request? + run-request-proc run-request-when + + run wrap run-wrap run-wrap-at + %current-agenda start-agenda agenda-run-once)) @@ -49,12 +64,13 @@ ;;; and with reasonable separation from functional components? (define-immutable-record-type - (make-agenda-intern queue prompt-tag port-mapping schedule) + (make-agenda-intern queue prompt-tag port-mapping schedule time) agenda? (queue agenda-queue) (prompt-tag agenda-prompt-tag) (port-mapping agenda-port-mapping) - (schedule agenda-schedule)) + (schedule agenda-schedule) + (time agenda-time)) (define (make-async-prompt-tag) (make-prompt-tag "prompt")) @@ -63,8 +79,9 @@ (queue (make-q)) (prompt (make-prompt-tag)) (port-mapping (make-port-mapping)) - (schedule (make-schedule))) - (make-agenda-intern queue prompt port-mapping schedule)) + (schedule (make-schedule)) + (time (gettimeofday))) + (make-agenda-intern queue prompt port-mapping schedule time)) @@ -73,7 +90,7 @@ ;;; This is where we handle timed events for the future -;; This section totally borrows from SICP +;; This section totally borrows from the ideas in SICP ;; <3 <3 <3 ;; NOTE: time is a cons of (seconds . microseconds) @@ -114,6 +131,21 @@ (or (time-< time1 time2) (time-= time1 time2))) + +(define-record-type + (make-time-delta-intern sec usec) + time-delta? + (sec time-delta-sec) + (usec time-delta-usec)) + +(define* (make-time-delta sec #:optional usec) + (make-time-delta-intern sec (or usec 0))) + +(define (time-+ time time-delta) + (cons (+ (car time) (time-delta-sec time-delta)) + (+ (cdr time) (time-delta-usec time-delta)))) + + (define-record-type (make-schedule-intern segments) schedule? @@ -126,7 +158,7 @@ ;; mutates AND is worst case of O(n) in both space and time :( ;; but at least it'll be reasonably easy to refactor to ;; a more functional setup? -(define (schedule-add! time proc schedule) +(define (schedule-add! schedule time proc) (let ((time (time-segment-right-format time))) (define (new-time-segment) (let ((new-segment @@ -145,7 +177,7 @@ (match segments ;; If we're at the end of the list, time to make a new ;; segment... - ('() (cons (make-time-segment time) '())) + ('() (cons (new-time-segment) '())) ;; If the segment's time is exactly our time, good news ;; everyone! Let's append our stuff to its queue (((? segment-equals-time? first) rest ...) @@ -166,6 +198,49 @@ (define (schedule-empty? schedule) (eq? (schedule-segments schedule) '())) +(define (schedule-segments-split schedule time) + "Does a multiple value return of time segments before/at and after TIME" + (let ((time (time-segment-right-format time))) + (define (segment-is-now? segment) + (time-= (time-segment-time segment) time)) + (define (segment-is-before-now? segment) + (time-< (time-segment-time segment) time)) + + (let loop ((segments-before '()) + (segments-left (schedule-segments schedule))) + (match segments-left + ;; end of the line, return + ('() + (values (reverse segments-before) '())) + + ;; It's right now, so time to stop, but include this one in before + ;; but otherwise return + (((? segment-is-now? first) rest ...) + (values (reverse (cons first segments-before)) rest)) + + ;; This is prior or at now, so add it and keep going + (((? segment-is-before-now? first) rest ...) + (loop (cons first segments-before) rest)) + + ;; Otherwise it's past now, just return what we have + (segments-after + (values segments-before segments-after)))))) + +(define (schedule-extract-until! schedule time) + "Extract all segments until TIME from SCHEDULE, and pop old segments off" + (receive (segments-before segments-after) + (schedule-segments-split schedule time) + (set-schedule-segments! schedule segments-after) + segments-before)) + +(define (add-segments-contents-to-queue! segments queue) + (for-each + (lambda (segment) + (let ((seg-queue (time-segment-queue segment))) + (while (not (q-empty? seg-queue)) + (enq! queue (deq! seg-queue))))) + segments)) + ;;; Port handling @@ -197,6 +272,29 @@ (not (port-mapping-empty? port-mapping))) + +;;; Request to run stuff +;;; ==================== + +(define-record-type + (make-run-request proc when) + run-request? + (proc run-request-proc) + (when run-request-when)) + +(define* (run proc #:optional when) + (make-run-request proc when)) + +(define-syntax-rule (wrap body ...) + (lambda () + body ...)) + +(define-syntax-rule (run-wrap body ...) + (run (wrap body ...))) + +(define-syntax-rule (run-wrap-at body ... when) + (run (wrap body ...) when)) + ;;; Execution of agenda, and current agenda ;;; ======================================= @@ -213,7 +311,12 @@ (agenda-run-once agenda)))) (if (and stop-condition (stop-condition agenda)) 'done - (loop new-agenda))))) + (let ((updated-agenda + ;; Adjust the agenda's time just in time + ;; We do this here rather than in agenda-run-once to make + ;; agenda-run-once's behavior fairly predictable + (set-field new-agenda (agenda-time) (gettimeofday)))) + (loop updated-agenda)))))) (define (agenda-run-once agenda) "Run once through the agenda, and produce a new agenda @@ -232,19 +335,36 @@ based on the results" (let* ((proc (q-pop! queue)) (proc-result (call-proc proc)) (enqueue - (lambda (new-proc) - (enq! next-queue new-proc)))) + (lambda (run-request) + (define (schedule-at! time proc) + (schedule-add! (agenda-schedule agenda) time proc)) + (let ((request-time (run-request-when run-request))) + (match request-time + ((? time-delta? time-delta) + (let ((time (time-+ (agenda-time agenda) + time-delta))) + (schedule-at! time (run-request-proc proc)))) + ((? integer? sec) + (let ((time (cons sec 0))) + (schedule-at! time (run-request-proc proc)))) + (((? integer? sec) . (? integer? usec)) + (schedule-at! request-time (run-request-proc proc))) + (#f + (enq! next-queue (run-request-proc run-request)))))))) ;; @@: We might support delay-wrapped procedures here (match proc-result - ((? procedure? new-proc) + ;; TODO: replace procedure with something that indicates + ;; intent to run. Use a (run foo) procedure + ((? run-request? new-proc) (enqueue new-proc)) - (((? procedure? new-procs) ...) + (((? run-request? new-procs) ...) (for-each (lambda (new-proc) (enqueue new-proc)) new-procs)) ;; do nothing (_ #f)))) - ;; TODO: Selecting on ports would happen here? + ;; TODO: Alternately, we could return the next-queue + ;; along with changes to be added to the schedule here? ;; Return new agenda, with next queue set (set-field agenda (agenda-queue) next-queue)))