diff options
Diffstat (limited to '2d')
| -rw-r--r-- | 2d/agenda.scm | 69 |
1 files changed, 37 insertions, 32 deletions
diff --git a/2d/agenda.scm b/2d/agenda.scm index 2b28a54..5154f06 100644 --- a/2d/agenda.scm +++ b/2d/agenda.scm @@ -23,6 +23,7 @@ (define-module (2d agenda) #:use-module (ice-9 q) + #:use-module (ice-9 threads) #:use-module (srfi srfi-1) #:use-module (srfi srfi-9) #:use-module (srfi srfi-26) @@ -67,14 +68,15 @@ list CALLBACKS." ;;; (define-record-type <agenda> - (%make-agenda time segments) + (%make-agenda time mutex segments) agenda? (time agenda-time set-agenda-time!) + (mutex agenda-mutex) (segments agenda-segments set-agenda-segments!)) (define (make-agenda) "Create a new, empty agenda." - (%make-agenda 0 '())) + (%make-agenda 0 (make-mutex 'recursive) '())) (define (agenda-empty? agenda) "Return #t if AGENDA has no scheduled procedures." @@ -119,43 +121,46 @@ and enqueue CALLBACK." (define (tick-agenda! agenda) "Move AGENDA forward in time and run scheduled procedures." - (set-agenda-time! agenda (1+ (agenda-time agenda))) - (let next-segment () - (unless (agenda-empty? agenda) - (let ((segment (first-segment agenda))) - ;; Process time segment if it is scheduled before or at the - ;; current agenda time. - (when (>= (agenda-time agenda) (segment-time segment)) - (flush-queue! (segment-queue segment)) - (set-agenda-segments! agenda (rest-segments agenda)) - (next-segment)))))) + (with-mutex (agenda-mutex agenda) + (set-agenda-time! agenda (1+ (agenda-time agenda))) + (let next-segment () + (unless (agenda-empty? agenda) + (let ((segment (first-segment agenda))) + ;; Process time segment if it is scheduled before or at the + ;; current agenda time. + (when (>= (agenda-time agenda) (segment-time segment)) + (flush-queue! (segment-queue segment)) + (set-agenda-segments! agenda (rest-segments agenda)) + (next-segment))))))) (define (clear-agenda! agenda) "Remove all scheduled procedures from AGENDA." - (set-agenda-segments! agenda '())) + (with-mutex (agenda-mutex agenda) + (set-agenda-segments! agenda '()))) (define* (schedule agenda thunk #:optional (delay 1)) "Schedule the procedure THUNK in AGENDA to be run DELAY ticks from now. DELAY defaults to 1 if not specified." - (let ((time (agenda-time-delay agenda delay))) - (define (belongs-before? segments) - (or (null? segments) - (< time (segment-time (car segments))))) - - (define (add-to-segments segments) - ;; Add to existing time segment if the times match - (if (= (segment-time (car segments)) time) - (segment-enq (car segments) thunk) - ;; Continue searching - (if (belongs-before? (cdr segments)) - ;; Create new time segment and insert it where it belongs - (insert-segment segments time thunk) - ;; Continue searching - (add-to-segments (cdr segments))))) - - (if (belongs-before? (agenda-segments agenda)) - (agenda-add-segment agenda time thunk) - (add-to-segments (agenda-segments agenda))))) + (with-mutex (agenda-mutex agenda) + (let ((time (agenda-time-delay agenda delay))) + (define (belongs-before? segments) + (or (null? segments) + (< time (segment-time (car segments))))) + + (define (add-to-segments segments) + ;; Add to existing time segment if the times match + (if (= (segment-time (car segments)) time) + (segment-enq (car segments) thunk) + ;; Continue searching + (if (belongs-before? (cdr segments)) + ;; Create new time segment and insert it where it belongs + (insert-segment segments time thunk) + ;; Continue searching + (add-to-segments (cdr segments))))) + + (if (belongs-before? (agenda-segments agenda)) + (agenda-add-segment agenda time thunk) + (add-to-segments (agenda-segments agenda)))))) (define (schedule-interval agenda thunk delay) "Schedule THUNK within AGENDA to be applied every DELAY ticks." |