-(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))
;; @@: Using immutable agendas here, so wouldn't it make sense to
;; replace this queue stuff with using pfds based immutable queues?
+;;; The agenda consists of:
+;;; - a queue of immediate items to handle
+;;; - sheduled future events to be added to a future queue
+;;; - a tag by which running processes can escape for some asynchronous
+;;; operation (from which they can be returned later)
+;;; - a mapping of ports to various handler procedures
+;;;
+;;; The goal, eventually, is for this all to be immutable and functional.
+;;; However, we aren't there yet. Some tricky things:
+;;; - The schedule needs to be immutable, yet reasonably efficient.
+;;; - Need to use immutable queues (ijp's pfds library?)
+;;; - Modeling reading from ports as something repeatable,
+;;; and with reasonable separation from functional components?
+
(define-immutable-record-type <agenda>
- (make-agenda-intern queue prompt-tag port-mapping)
+ (make-agenda-intern queue prompt-tag port-mapping schedule)
agenda?
(queue agenda-queue)
(prompt-tag agenda-prompt-tag)
- (port-mapping agenda-port-mapping))
+ (port-mapping agenda-port-mapping)
+ (schedule agenda-schedule))
(define (make-async-prompt-tag)
(make-prompt-tag "prompt"))
(define* (make-agenda #:key
(queue (make-q))
(prompt (make-prompt-tag))
- (port-mapping (make-port-mapping)))
- (make-agenda-intern queue prompt port-mapping))
+ (port-mapping (make-port-mapping))
+ (schedule (make-schedule)))
+ (make-agenda-intern queue prompt port-mapping schedule))
+
+
+;;; Schedule
+;;;
+;;; This is where we handle timed events for the future
+
+;; This section totally borrows from SICP
+;; <3 <3 <3
+
+;; NOTE: time is a cons of (seconds . microseconds)
+
+(define-record-type <time-segment>
+ (make-time-segment-intern time queue)
+ time-segment?
+ (time time-segment-time)
+ (queue time-segment-queue time-segment-set-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)))
+ (make-time-segment-intern time queue))
+
+(define (make-schedule)
+ '())
+
+(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 (schedule-add! time proc schedule)
+ (let ((time (time-segment-right-format time)))
+ (define (belongs-before? segments)
+ (or (null? segments)
+ (error))
+ )
+
+ ;; Find and add a schedule segment
+ (error)))
+
+(define (schedule-empty? schedule)
+ (eq? schedule '()))
+
+
+;;; Port handling
(define (make-port-mapping)
(make-hash-table))
-(define (port-mapping-set! port-mapping port #:optional read write except)
+(define* (port-mapping-set! port-mapping port #:optional read write except)
"Sets port-mapping for reader / writer / exception handlers"
(if (not (or read write except))
(throw 'no-handlers-given "No handlers given for port" port))
"Whether this port-mapping contains any elements"
(not (port-mapping-empty? port-mapping)))
+
+;;; Execution of agenda, and current agenda
+
(define %current-agenda (make-parameter #f))
(define* (start-agenda agenda #:optional stop-condition)