Re: Res: How do you implement Lua event handlers in your game?

[Gé Weijers <ge@...>]

On Apr 11, 2007, at 9:49 AM, Luiz Henrique de Figueiredo wrote:

On the downside: the registry table can never shrink. Once you use a

million references those 12-16 million bytes will stay allocated until

the lua_State object is destroyed.

Not if you use luaL_unref to release references.

--lhf

How's this code shrinking the array? The objects referred to will be recycled if you use luaL_unref and it's the only reference, but luaL_unref builds a linked list out of recycled indices right inside the registry array, so the array cannot shrink, as far as I can tell.

LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {

  if (ref >= 0) {

    t = abs_index(L, t);

    lua_rawgeti(L, t, FREELIST_REF);

    lua_rawseti(L, t, ref);  /* t[ref] = t[FREELIST_REF] */

    lua_pushinteger(L, ref);

    lua_rawseti(L, t, FREELIST_REF);  /* t[FREELIST_REF] = ref */

  }

}

Gé

--

Gé Weijers

ge@weijers.org