1 files changed, 41 insertions, 0 deletions
diff --git a/src/tests/threads/priority-preempt.c b/src/tests/threads/priority-preempt.c
new file mode 100644
index 0000000..3c3aacb
--- /dev/null
+++ b/src/tests/threads/priority-preempt.c
@@ -0,0 +1,41 @@
+/* Ensures that a high-priority thread really preempts.
+
+   Based on a test originally submitted for Stanford's CS 140 in
+   winter 1999 by by Matt Franklin
+   <startled@leland.stanford.edu>, Greg Hutchins
+   <gmh@leland.stanford.edu>, Yu Ping Hu <yph@cs.stanford.edu>.
+   Modified by arens. */
+
+#include <stdio.h>
+#include "tests/threads/tests.h"
+#include "threads/init.h"
+#include "threads/synch.h"
+#include "threads/thread.h"
+
+static thread_func simple_thread_func;
+
+void
+test_priority_preempt (void) 
+{
+  /* This test does not work with the MLFQS. */
+  ASSERT (!thread_mlfqs);
+
+  /* Make sure our priority is the default. */
+  ASSERT (thread_get_priority () == PRI_DEFAULT);
+
+  thread_create ("high-priority", PRI_DEFAULT + 1, simple_thread_func, NULL);
+  msg ("The high-priority thread should have already completed.");
+}
+
+static void 
+simple_thread_func (void *aux UNUSED) 
+{
+  int i;
+  
+  for (i = 0; i < 5; i++) 
+    {
+      msg ("Thread %s iteration %d", thread_name (), i);
+      thread_yield ();
+    }
+  msg ("Thread %s done!", thread_name ());
+}