Fix scheduler locking hierarchy

init/init.c

@@ -48,22 +48,23 @@ void app_main (void) {
   spawn (&app_thread1);
 
   for (;;) {
-    /* lock_mutex (MUTEX, RV_PRIVATE); */
+    lock_mutex (MUTEX, RV_PRIVATE);
 
     for (int i = 0; i < 3; i++)
       test ('a');
 
-    /* unlock_mutex (MUTEX, RV_PRIVATE); */
+    unlock_mutex (MUTEX, RV_PRIVATE);
   }
 }
 
 void app_thread1 (void) {
-  for (int i = 0; i < 3; i++)
-    test ('b');
   for (;;) {
-    /* lock_mutex (MUTEX, RV_PRIVATE); */
+    lock_mutex (MUTEX, RV_PRIVATE);
 
-    /* unlock_mutex (MUTEX, RV_PRIVATE); */
+    for (int i = 0; i < 3; i++)
+      test ('b');
+
+    unlock_mutex (MUTEX, RV_PRIVATE);
   }
 
   quit ();