1 files changed, 2 insertions, 0 deletions

diff --git a/threads/synch.h b/threads/synch.h
index a19e88b..cdf415c 100644
--- a/threads/synch.h
+++ b/threads/synch.h
@@ -22,6 +22,8 @@ struct lock
   {
     struct thread *holder;      /* Thread holding lock (for debugging). */
     struct semaphore semaphore; /* Binary semaphore controlling access. */
+    int priority;               /* the priority of the thread with the highest priority currently acquiring the lock */
+    struct list_elem elem;      /* list element for (struct thread)->locks */
   };
 
 void lock_init (struct lock *);