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On Wed, Sep 4, 2013 at 8:33 PM, Tom N Harris <> wrote:
> On Monday, September 02, 2013 03:14:08 PM Emil Renner Berthing wrote:
>> +LUA_API void  (lua_setstatedata) (lua_State *L, void *sd);
>> +LUA_API void *(lua_getstatedata) (lua_State *L);
> What's the problem with storing a lightuserdata in the registry?

Performance, mostly. That's a table lookup worth of overhead for every
function that needs to fetch it. A C function accessing a field in the
lua_State is substantially faster.

/s/ Adam