1 files changed, 20 insertions, 0 deletions

diff --git a/lapi.h b/lapi.h
index 757bf3d2..21be4a24 100644
--- a/lapi.h
+++ b/lapi.h
@@ -12,12 +12,32 @@
 #include "lstate.h"
 
 
+#if defined(LUA_USE_APICHECK)
+#include <assert.h>
+#define api_check(l,e,msg)      assert(e)
+#else   /* for testing */
+#define api_check(l,e,msg)      ((void)(l), lua_assert((e) && msg))
+#endif
+
+
+
 /* Increments 'L->top.p', checking for stack overflows */
 #define api_incr_top(L)  \
     (L->top.p++, api_check(L, L->top.p <= L->ci->top.p, "stack overflow"))
 
 
 /*
+** macros that are executed whenever program enters the Lua core
+** ('lua_lock') and leaves the core ('lua_unlock')
+*/
+#if !defined(lua_lock)
+#define lua_lock(L)     ((void) 0)
+#define lua_unlock(L)   ((void) 0)
+#endif
+
+
+
+/*
 ** If a call returns too many multiple returns, the callee may not have
 ** stack space to accommodate all results. In this case, this macro
 ** increases its stack space ('L->ci->top.p').