lower priority

src/threads/thread.c

@@ -352,13 +352,28 @@ thread_foreach (thread_action_func *func, void *aux)
 void
 thread_set_priority (int new_priority) 
 {
-        thread_current ()->priority = new_priority;
+	//todo check if lower than any ready thread.
+    thread_current ()->priority = new_priority;
+	struct list_elem* e;
+	struct thread* e2;
+	bool y = false;
+	for (e = (list_begin (&ready_list)); e!= list_end (&ready_list); 
+	     e = list_next(e))
+	{
+		e2 = list_entry (e, struct thread, elem);
+		if ((e2->priority) >(thread_current ()->priority)){
+			y = true;
+			break;
+		}
+	}
+	if (y){thread_yield();}
 }
 
 /* Returns the current thread's priority. */
 int
 thread_get_priority (void) 
 {
+	//todo recursive with list or number check
     return thread_current ()->priority;
 }