--- /dev/null
+/* Problem 1-3: Priority Scheduling tests.
+
+ 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"
+
+struct locks
+ {
+ struct lock *a;
+ struct lock *b;
+ };
+
+static thread_func medium_thread_func;
+static thread_func high_thread_func;
+
+void
+test_priority_donate_nest (void)
+{
+ struct lock a, b;
+ struct locks locks;
+
+ /* This test does not work with the MLFQS. */
+ ASSERT (!enable_mlfqs);
+
+ /* Make sure our priority is the default. */
+ ASSERT (thread_get_priority () == PRI_DEFAULT);
+
+ lock_init (&a);
+ lock_init (&b);
+
+ lock_acquire (&a);
+
+ locks.a = &a;
+ locks.b = &b;
+ thread_create ("medium", PRI_DEFAULT - 1, medium_thread_func, &locks);
+ thread_yield ();
+ msg ("Low thread should have priority %d. Actual priority: %d.",
+ PRI_DEFAULT - 1, thread_get_priority ());
+
+ thread_create ("high", PRI_DEFAULT - 2, high_thread_func, &b);
+ thread_yield ();
+ msg ("Low thread should have priority %d. Actual priority: %d.",
+ PRI_DEFAULT - 2, thread_get_priority ());
+
+ lock_release (&a);
+ thread_yield ();
+ msg ("Medium thread should just have finished.");
+ msg ("Low thread should have priority %d. Actual priority: %d.",
+ PRI_DEFAULT, thread_get_priority ());
+}
+
+static void
+medium_thread_func (void *locks_)
+{
+ struct locks *locks = locks_;
+
+ lock_acquire (locks->b);
+ lock_acquire (locks->a);
+
+ msg ("Medium thread should have priority %d. Actual priority: %d.",
+ PRI_DEFAULT - 2, thread_get_priority ());
+ msg ("Medium thread got the lock.");
+
+ lock_release (locks->a);
+ thread_yield ();
+
+ lock_release (locks->b);
+ thread_yield ();
+
+ msg ("High thread should have just finished.");
+ msg ("Middle thread finished.");
+}
+
+static void
+high_thread_func (void *lock_)
+{
+ struct lock *lock = lock_;
+
+ lock_acquire (lock);
+ msg ("High thread got the lock.");
+ lock_release (lock);
+ msg ("High thread finished.");
+}