lua_gettable[-1, +1, e] int lua_gettable (lua_State *L, int index); Pushes onto the stack the

lua_KFunction typedef int (*lua_KFunction) (lua_State *L, int status, lua_KContext ctx); Type for continuation functions (see

lua_upvaluejoin[-0, +0, –] void lua_upvaluejoin (lua_State *L, int funcindex1, int n1,

lua_pushnil[-0, +1, –] void lua_pushnil (lua_State *L); Pushes a nil value onto the stack.

lua_setuservalue[-1, +0, –] void lua_setuservalue (lua_State *L, int index); Pops a value from the stack

coroutine.isyieldable () Returns true when the running coroutine can yield. A running coroutine is yieldable if it is not the main thread and it is not inside a non-yieldable

luaL_Reg typedef struct luaL_Reg { const char *name; lua_CFunction func; } luaL_Reg; Type for arrays of functions to be registered

debug.sethook ([thread,] hook, mask [, count]) Sets the given function as a hook. The string mask and the number count describe when the hook will be

math.rad (x) Converts the angle x from degrees to radians.

os.clock () Returns an approximation of the amount in seconds of CPU time used by the program.