X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Ftests%2Fthreads%2Fpriority-change.c;h=810b05a1d76973ebdf28f914d03c91318c021e85;hb=2c01b318e4bc07464a59fe5d21bc520978d82540;hp=456de33a27217c4e5647bb2b1329635ee836ad8c;hpb=4ebf33908a571a7cde93fe618902b044e3633cdf;p=pintos-anon

diff --git a/src/tests/threads/priority-change.c b/src/tests/threads/priority-change.c
index 456de33..810b05a 100644
--- a/src/tests/threads/priority-change.c
+++ b/src/tests/threads/priority-change.c
@@ -1,3 +1,7 @@
+/* Verifies that lowering a thread's priority so that it is no
+   longer the highest-priority thread in the system causes it to
+   yield immediately. */
+
 #include <stdio.h>
 #include "tests/threads/tests.h"
 #include "threads/init.h"
@@ -9,12 +13,12 @@ void
 test_priority_change (void) 
 {
   /* This test does not work with the MLFQS. */
-  ASSERT (!enable_mlfqs);
+  ASSERT (!thread_mlfqs);
 
   msg ("Creating a high-priority thread 2.");
-  thread_create ("thread 2", PRI_DEFAULT - 1, changing_thread, NULL);
+  thread_create ("thread 2", PRI_DEFAULT + 1, changing_thread, NULL);
   msg ("Thread 2 should have just lowered its priority.");
-  thread_set_priority (PRI_DEFAULT + 2);
+  thread_set_priority (PRI_DEFAULT - 2);
   msg ("Thread 2 should have just exited.");
 }
 
@@ -22,6 +26,6 @@ static void
 changing_thread (void *aux UNUSED) 
 {
   msg ("Thread 2 now lowering priority.");
-  thread_set_priority (PRI_DEFAULT + 1);
+  thread_set_priority (PRI_DEFAULT - 1);
   msg ("Thread 2 exiting.");
 }