TD2 II.3-4 Manage UserStack with Bitmap

Add a Semaphore to manage threads waiting list

code/test/threadcreate.c

@@ -6,15 +6,15 @@ void f(int c) {
      * a problem here, when executing a thread there is not 8 iterations.
      * This is like synchronisation */
     volatile int i;
-    for (i=0;i<8;i++){
+    for (i=0;i<16;i++){
         PutChar((char)c);
     }
     ThreadExit();
 }
 
 int main(){
-    int i = 64;
-    for (i=64; i < 68; i++){
+    int i;
+    for (i=65; i < 91; i++){
         ThreadCreate(f, i);
     }
     // PutString("end of main()\n");