try to implement join

test/syscall_tests/Makefile

@@ -1,4 +1,4 @@
-PROGRAMS = halt.guac prints.guac producteur_consommateur.guac
+PROGRAMS = halt.guac prints.guac producteur_consommateur.guac join.guac
 TOPDIR = ../..
 include $(TOPDIR)/Makefile.rules
 

test/syscall_tests/join.c

@@ -0,0 +1,36 @@
+#include "userlib/syscall.h"
+#include "userlib/libnachos.h"
+
+
+const int N = 3;
+int iplein = 0;
+int ivide = 0;
+int tab[3];
+SemId svide;
+SemId splein;
+
+void th1();
+
+void th2();
+
+int main() {
+    ThreadId th1 = threadCreate("th1", th1);
+    ThreadId th2 = threadCreate("th2", th2);
+    Join(th1);
+    Join(th2);
+    return 0;
+}
+
+void th1() {
+    for(int i = 0; i < 10; i++) 
+    {
+        n_printf("Hello from th1\n");
+    }
+}
+
+void th2() {
+    for(int i = 0; i < 10; i++) 
+    {
+        n_printf("Hello from th2\n");
+    }
+}