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- Subject: Re: void* in Lua_State for Application?
- From: Roberto Ierusalimschy <roberto@...>
- Date: Thu, 5 Sep 2013 11:31:14 -0300
> On Wed, Sep 4, 2013 at 8:33 PM, Tom N Harris <email@example.com> 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.
Did you benchmark it for any real case (that is, a case that will waste
some time doing something useful with the retrieved pointer)?