1 files changed, 6 insertions, 0 deletions
diff --git a/kern/mutex.h b/kern/mutex.h
index 3a74eb2f..dcbf98eb 100644
--- a/kern/mutex.h
+++ b/kern/mutex.h
@@ -26,11 +26,17 @@
 #include <kern/assert.h>
 #include <kern/list.h>
 #include <kern/spinlock.h>
+#include <kern/thread.h>
 
 #define MUTEX_UNLOCKED  0
 #define MUTEX_LOCKED    1
 #define MUTEX_CONTENDED 2
 
+struct mutex_waiter {
+    struct list node;
+    struct thread *thread;
+};
+
 struct mutex {
     unsigned long state;
     struct spinlock lock;