X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Ftests%2Fthreads%2Fpriority-change.c;h=bb462d462d85fe02c1a4ca22a132883ec881c0b4;hb=5cdab0175a2d4ed5731b4cb41c106a36985f0f7f;hp=456de33a27217c4e5647bb2b1329635ee836ad8c;hpb=615bf3b3d2a8573ed6fb9ddc0055745e163ac999;p=pintos-anon

diff --git a/src/tests/threads/priority-change.c b/src/tests/threads/priority-change.c
index 456de33..bb462d4 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"
@@ -12,9 +16,9 @@ test_priority_change (void)
   ASSERT (!enable_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.");
 }