Working on scheduler.

[sam.git] / sam.scm

diff --git a/sam.scm b/sam.scm
index 431cd1c..5c5ec88 100644 (file)
--- a/sam.scm
+++ b/sam.scm
@@ -8,8 +8,8 @@
         matchable
         srfi-18 ; threads
         srfi-69 ; hashtable
-        udp6
-        uri-generic)
+        udp
+        fifo)
 
 ;; Actors
 
@@ -38,18 +38,19 @@
   
 (define (deliver-message address . message)
   (let ((id (address-id address)))
-    (let ((behaviour (hash-table-ref/default actor-table id '()))))
-    (if (null? behaviour)
-        (print "Warning: discarded message" message " to unknown actor " address)
-        (match (apply (hash-table-ref actor-table id) (cons address message))
-          ('done (hash-table-delete! actor-table actor))
-          ('sleep 'do-nothing)
-          (new-beh (hash-table-put! actor new-beh))))))
+    (let ((behaviour (hash-table-ref/default actor-table id '())))
+      (if (null? behaviour)
+          (print "Warning: discarded message" message " to unknown actor " address)
+          (match (apply (hash-table-ref actor-table id) (cons address message))
+            ('done (hash-table-delete! actor-table actor))
+            ('sleep 'do-nothing)
+            (new-beh (hash-table-put! actor new-beh)))))))
 
 ;; Scheduler
 
 (define local-queue-mutex (make-mutex "message queue"))
 (define message-available-mutex (make-mutex "message available"))
+(mutex-lock! message-available-mutex #f #f)
 (define local-queue (make-fifo))
 
 (define (send-message address . message)
@@ -61,6 +62,7 @@
 (define (send-local-message address . message)
   (mutex-lock! local-queue-mutex)
   (fifo-push local-queue (cons address message))
+  (mutex-unlock! message-available-mutex)
   (mutex-unlock! local-queue-mutex))
 
 (define (send-network-message address . message)
@@ -75,10 +77,10 @@
 
 (define (next-local-message)
   (let ((res #f))
+    (mutex-lock! message-available-mutex)
     (mutex-lock! local-queue-mutex)
-    (set! res (if (fifo-empty? local-queue)
-                  #f
-                  (fifo-pop local-queue)))
+    (set! res (fifo-pop local-queue))
+    (mutex-unlock! message-available-mutex)
     (mutex-unlock! local-queue-mutex)
     res))
 
@@ -86,9 +88,9 @@
   (make-thread
    (lambda ()
      (let loop ((next-addressed-message (next-local-message)))
-       (if next-addressed-message
-           (apply deliver-message next-addressed-message)
-           (begin
-             (lo))))))
+       (apply deliver-message next-addressed-message)
+       (loop (next-local-message))))))
 
-  (thread-start!))
+(thread-start! scheduler-thread)
+
+(thread-join! scheduler-thread)