Update releasing of locks to update donation information w/ S

src/threads/thread.c

@@ -408,6 +408,13 @@ thread_get_priority (void)
   return thread_current ()->priority;
 }
 
+/* Recalculates the effective priority of the current thread. */
+void
+thread_recalculate_priority (void)
+{
+  barrier ();
+};
+
 /* Sets the current thread's nice value to NICE. */
 void
 thread_set_nice (int nice UNUSED)