- (set! res (fifo-pop local-queue))
- (if (not (fifo-empty? local-queue))
- (mutex-unlock! message-available-mutex))
- (mutex-unlock! local-queue-mutex)
- res))
-
-(define (start-scheduler)
- (thread-start!
- (lambda ()
- (let loop ()
- (apply deliver-message (next-local-message))
- (loop)))))
-
-;; Console
-
-(define reader-queue-mutex (make-mutex "reader queue"))
-(define reader-available-mutex (make-mutex "reader available"))
-(mutex-lock! reader-available-mutex #f #f)
-(define reader-queue (make-fifo))
-
-(define console
- (make-actor (lambda (self . message)
- (mutex-lock! reader-queue-mutex)
- (fifo-push reader-queue (car message))
- (mutex-unlock! reader-available-mutex)
- (mutex-unlock! reader-queue-mutex)
- 'sleep)))
-
-(define (next-reader)
- (let ((res #f))
- (mutex-lock! reader-available-mutex #f #f)
- (mutex-lock! reader-queue-mutex)
- (set! res (fifo-pop reader-queue))
- (if (not (fifo-empty? reader-queue))
- (mutex-unlock! reader-available-mutex))
- (mutex-unlock! reader-queue-mutex)
- res))
-
-(define (start-console)
- (let loop ()
- (let ((reader (next-reader)))
- (##sys#thread-block-for-i/o! (current-thread) 0 #t)
- (thread-yield!)
- (send-message reader (read-line)))
- (loop)))
-
-
-;; System interface
-
-(define system
- (make-actor (lambda (self . message)
- (match message
- (('shutdown)
- (print "## System actor received shutdown message.")
- (exit 0)
- 'done)
- (('println strings ...)
- (apply print strings)
- 'sleep)))))
-
-;; Testing
-
-
-(send-message system 'println "Hello, what is your name?")
-(send-message console
- (make-actor (lambda (self . message)
- (match message
- ((name)
- (send-message system 'println "Hello, " name "!")
- 'done)))))
-
-(thread-start!
- (lambda ()
- (thread-sleep! 10)
- (send-message system 'shutdown)))
-
-(start-scheduler)
-(start-console)
-
-;; (thread-join! scheduler-thread)
+ (fifo-push local-queue (cons address message))
+ (mutex-unlock! message-available-mutex)
+ (mutex-unlock! local-queue-mutex))
+
+ (define (send-network-message address . message)
+ (let ((s (udp-open-socket))
+ (uri (address->uri address))
+ (packet (with-output-to-string
+ (lambda ()
+ (print (cons address message))))))
+ (udp-bind! s #f 0)
+ (udp-connect! s
+ (uri-host uri)
+ (uri-port uri))
+ (udp-send s packet)
+ (udp-close-socket s)))
+
+ (define (next-local-message)
+ (let ((res #f))
+ (mutex-lock! message-available-mutex #f #f)
+ (mutex-lock! local-queue-mutex)
+ (set! res (fifo-pop local-queue))
+ (if (not (fifo-empty? local-queue))
+ (mutex-unlock! message-available-mutex))
+ (mutex-unlock! local-queue-mutex)
+ res))
+
+ (define (start-scheduler)
+ (thread-start!
+ (lambda ()
+ (let loop ()
+ (apply deliver-message (next-local-message))
+ (loop)))))
+
+
+ ;; Network
+
+ (define (start-network-listener)
+ (thread-start!
+ (lambda ()
+ (let ((s (udp-open-socket*)))
+ (udp-bind! s #f sam-port)
+ (let loop ()
+ (let-values (((n str) (udp-recv s 1024)))
+ (print "network-listener: Received " n " bytes over network: " str)
+ (match (with-input-from-string str read)
+ ((address message ...)
+ (apply send-message (cons address message)))
+ (else
+ (print "Warning: received badly formatted message string '" str "'"))))
+ (loop))))))
+
+ ;; System interface
+
+ (define reader-queue-mutex (make-mutex "reader queue"))
+ (define reader-available-mutex (make-mutex "reader available"))
+ (mutex-lock! reader-available-mutex #f #f)
+ (define reader-queue (make-fifo))
+
+ (define (next-reader)
+ (let ((res #f))
+ (mutex-lock! reader-available-mutex #f #f)
+ (mutex-lock! reader-queue-mutex)
+ (set! res (fifo-pop reader-queue))
+ (if (not (fifo-empty? reader-queue))
+ (mutex-unlock! reader-available-mutex))
+ (mutex-unlock! reader-queue-mutex)
+ res))
+
+ (define (start-console)
+ (let loop ()
+ (let ((reader (next-reader)))
+ (print "console: received next reader: " reader)
+ (##sys#thread-block-for-i/o! (current-thread) 0 #t)
+ (thread-yield!)
+ (send-message reader (read-line)))
+ (loop)))
+
+ ;; System initialization
+
+ (define (make-system-actor)
+ (make-actor (lambda (self . message)
+ (match message
+
+ (('shutdown)
+ (print "## System actor received shutdown message.")
+ (exit 0)
+ 'done)
+
+ (('print strings ...)
+ (apply print strings)
+ 'sleep)
+
+ (('read reader)
+ (mutex-lock! reader-queue-mutex)
+ (fifo-push reader-queue reader)
+ (mutex-unlock! reader-available-mutex)
+ (mutex-unlock! reader-queue-mutex)
+ 'sleep)))))
+
+ (define system #f)
+
+ (define (init-sam host port)
+ (set! sam-host host)
+ (set! sam-port port)
+ (set! system (make-system-actor))
+ (start-scheduler)
+ (start-network-listener)))