1 files changed, 13 insertions, 0 deletions

diff --git a/ldo.c b/ldo.c
index 699a9d2a..cd6dded6 100644
--- a/ldo.c
+++ b/ldo.c
@@ -39,6 +39,19 @@
 
 
 /*
+** these macros allow user-specific actions when a thread is
+** resumed/yielded.
+*/
+#if !defined(luai_userstateresume)
+#define luai_userstateresume(L,n)       ((void)L)
+#endif
+
+#if !defined(luai_userstateyield)
+#define luai_userstateyield(L,n)        ((void)L)
+#endif
+
+
+/*
 ** {======================================================
 ** Error-recovery functions
 ** =======================================================