1 files changed, 5 insertions, 2 deletions
diff --git a/implement.h b/implement.h
index a1a52f8..8297a46 100644
--- a/implement.h
+++ b/implement.h
@@ -127,11 +127,14 @@ struct pthread_mutexattr_t_ {
 };
 
 struct pthread_mutex_t_ {
-  int lock_idx;
-  int try_lock;
+  long lock_idx;
+  long try_lock;
   int pshared;
   int type;
   pthread_t owner;
+  long waiters;                      /* These last elements ensure fairness */
+  pthread_t lastOwner;               /* and guard against canceled threads. */
+  pthread_t lastWaiter;
 };
 
 struct pthread_key_t_ {