1 files changed, 53 insertions, 0 deletions

diff --git a/tests/threads/priority-condvar.c b/tests/threads/priority-condvar.c
new file mode 100644
index 0000000..c1efb1b
--- /dev/null
+++ b/tests/threads/priority-condvar.c
@@ -0,0 +1,53 @@
+/* Tests that cond_signal() wakes up the highest-priority thread
+   waiting in cond_wait(). */
+
+#include <stdio.h>
+#include "tests/threads/tests.h"
+#include "threads/init.h"
+#include "threads/malloc.h"
+#include "threads/synch.h"
+#include "threads/thread.h"
+#include "devices/timer.h"
+
+static thread_func priority_condvar_thread;
+static struct lock lock;
+static struct condition condition;
+
+void
+test_priority_condvar (void) 
+{
+  int i;
+  
+  /* This test does not work with the MLFQS. */
+  ASSERT (!thread_mlfqs);
+
+  lock_init (&lock);
+  cond_init (&condition);
+
+  thread_set_priority (PRI_MIN);
+  for (i = 0; i < 10; i++) 
+    {
+      int priority = PRI_DEFAULT - (i + 7) % 10 - 1;
+      char name[16];
+      snprintf (name, sizeof name, "priority %d", priority);
+      thread_create (name, priority, priority_condvar_thread, NULL);
+    }
+
+  for (i = 0; i < 10; i++) 
+    {
+      lock_acquire (&lock);
+      msg ("Signaling...");
+      cond_signal (&condition, &lock);
+      lock_release (&lock);
+    }
+}
+
+static void
+priority_condvar_thread (void *aux UNUSED) 
+{
+  msg ("Thread %s starting.", thread_name ());
+  lock_acquire (&lock);
+  cond_wait (&condition, &lock);
+  msg ("Thread %s woke up.", thread_name ());
+  lock_release (&lock);
+}