X-Git-Url: https://git.jsancho.org/?p=gacela.git;a=blobdiff_plain;f=src%2Fsystem.scm;h=3c8454821b733e432dcef33fb9efb8d900bd4d10;hp=9df7cdcc5a701d84783f04e7157497936888513f;hb=0f49b8fac5821694a2db6f88b95423e5ad8aa719;hpb=c4ba277c7f9d23516926693b48e704ff3ea5e8f9

diff --git a/src/system.scm b/src/system.scm
index 9df7cdc..3c84548 100644
--- a/src/system.scm
+++ b/src/system.scm
@@ -180,5 +180,33 @@
 	  (set-entities res e c))))))
 
 
+(define (join-systems . systems)
+  (lambda (entities components)
+    (let run ((s systems) (e entities) (c components))
+      (cond ((null? s)
+	     (values e c))
+	    (else
+	     (receive (e2 c2) (((car s) e c))
+	       (run (cdr s) e2 c2)))))))
+
+
+(define (threaded-systems . systems)
+  (lambda (entities components)
+    (let run-wait ((thd
+		    (map
+		     (lambda (s)
+		       (call-with-new-thread
+			(lambda () (s entities components))))
+		     systems))
+		   (e entities) (c components))
+      (cond ((null? thd)
+	     (values e c))
+	    (else
+	     (receive (e2 c2) ((join-thread (car thd)) e c)
+	       (run-wait (cdr thd) e2 c2)))))))
+
+
 (export find-entities-by-components
-	make-system)
+	make-system
+	join-systems
+	threaded-systems)