From 0f49b8fac5821694a2db6f88b95423e5ad8aa719 Mon Sep 17 00:00:00 2001
From: Javier Sancho <jsf@jsancho.org>
Date: Wed, 21 Aug 2013 08:15:09 +0200
Subject: [PATCH] Functions to merge systems, using a linear way or using
 threads

* src/system.scm: join-systems
                  threaded-systems

* src/test.scm: merge functions testing
---
 src/system.scm | 30 +++++++++++++++++++++++++++++-
 src/test.scm   | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+), 1 deletion(-)

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)
diff --git a/src/test.scm b/src/test.scm
index 021afef..45bdef5 100644
--- a/src/test.scm
+++ b/src/test.scm
@@ -86,3 +86,37 @@
 ))
 
 (export test2)
+
+
+(define (test3)
+  (let ((entities '())
+	(components '())
+	(s1 (make-system '(l)
+	      (lambda (e)
+		(map
+		 (lambda (e1)
+		   `(,(car e1) . ((l . (cons 1 (cdr e1)))))
+		 e)))))
+	(s2 (make-system '(l)
+	      (lambda (e)
+		(map
+		 (lambda (e1)
+		   `(,(car e1) . ((l . (cons 2 (cdr e1))))))
+		 e)))))
+    (receive (e c) (set-entities `((#f . ((l . ()))) (#f . ((l . ())))) entities components)
+      ((join-systems s1 s2) e c))))
+
+(export test3)
+
+
+(define (test4)
+  (let ((f1 (lambda (e c) (sleep 3) (lambda (e2 c2) (values (+ 1 e2) c2))))
+	(f2 (lambda (e c) (sleep 4) (lambda (e2 c2) (values e2 (+ 10 c2))))))
+    (let ((t (current-time)))
+      (receive (e c) ((join-systems f1 f2) 2 2) (format #t "~a~%~a~%" e c))
+      (display (- (current-time) t)) (newline) (newline))
+    (let ((t (current-time)))
+      (receive (e c) ((threaded-systems f1 f2) 2 2) (format #t "~a~%~a~%" e c))
+      (display (- (current-time) t)) (newline) (newline))))
+
+(export test4)
-- 
2.39.5