-(use-modules (srfi srfi-9)
- (srfi srfi-9 gnu)
- (ice-9 q)
- (ice-9 match))
+(define-module (loopy agenda)
+ #:use-module (srfi srfi-9)
+ #:use-module (srfi srfi-9 gnu)
+ #:use-module (ice-9 q)
+ #:use-module (ice-9 match)
+ #:export (make-agenda
+ agenda?
+ agenda-queue agenda-prompt-tag
+ agenda-port-pmapping agenda-schedule
+
+ make-async-prompt-tag
+
+ make-time-segment
+ time-segment?
+ time-segment-time time-segment-queue
+
+ time-< time-=
+
+ make-schedule
+ schedule-add! schedule-empty?
+
+ make-port-mapping
+ port-mapping-set! port-mapping-remove!
+ port-mapping-empty? port-mapping-non-empty?
+
+ %current-agenda
+ start-agenda agenda-run-once))
;; @@: Using immutable agendas here, so wouldn't it make sense to
;; replace this queue stuff with using pfds based immutable queues?
+\f
+;;; Agenda definition
+;;; =================
+
;;; The agenda consists of:
;;; - a queue of immediate items to handle
;;; - sheduled future events to be added to a future queue
(prompt (make-prompt-tag))
(port-mapping (make-port-mapping))
(schedule (make-schedule)))
- (make-agenda-intern queue prompt port-mapping))
+ (make-agenda-intern queue prompt port-mapping schedule))
+\f
;;; Schedule
-;;;
+;;; ========
+
;;; This is where we handle timed events for the future
;; This section totally borrows from SICP
(make-time-segment-intern time queue)
time-segment?
(time time-segment-time)
- (queue time-segment-queue time-segment-set-queue!))
+ (queue time-segment-queue))
+
+(define (time-segment-right-format time)
+ (match time
+ ;; time is already a cons of second and microsecnd
+ (((? integer? s) (? integer? u)) time)
+ ;; time was just an integer (just the second)
+ ((? integer? _) (cons time 0))
+ (_ (throw 'invalid-time "Invalid time" time))))
(define* (make-time-segment time #:optional (queue (make-q)))
- (let ((time (match time
- ;; time was just an integer (just the second)
- ((? integer? _) (cons time 0))
- ;; time is already a cons of second and microsecnd
- (((? integer? s) (? integer? u)) time)
- (_ (throw 'invalid-time "Invalid time" time)))))
- (make-time-segment-intern time queue)))
+ (make-time-segment-intern time queue))
+
+(define (time-< time1 time2)
+ (cond ((< (car time1)
+ (car time2))
+ #t)
+ ((and (= (car time1)
+ (car time2))
+ (< (cdr time1)
+ (cdr time2)))
+ #t)
+ (else #f)))
+
+(define (time-= time1 time2)
+ (and (= (car time1) (car time2))
+ (= (cdr time1) (cdr time2))))
(define (make-schedule)
'())
-(define (schedule-add-new-segment! schedule time)
- (error))
+(define (schedule-add! time proc schedule)
+ (let ((time (time-segment-right-format time)))
+ (define (belongs-before? segments)
+ (or (null? segments)
+ (error))
+ )
-(define (schedule-add! schedule time proc)
;; Find and add a schedule segment
- (error))
+ (error)))
(define (schedule-empty? schedule)
(eq? schedule '()))
+\f
;;; Port handling
+;;; =============
(define (make-port-mapping)
(make-hash-table))
(not (port-mapping-empty? port-mapping)))
+\f
;;; Execution of agenda, and current agenda
+;;; =======================================
(define %current-agenda (make-parameter #f))