Since the input argument named osize has not been used in the l_alloc() function, why still pass LUA_TTHREAD to this function in lua_newstate()?

[孙世龙 sunshilong <sunshilong369@...>]

Hi, list

Since the input argument named osize has not been used in the
l_alloc() function, why still pass LUA_TTHREAD to this function in
lua_newstate()?
For your convenience, the related code snippets are seen at the footnotes.
Thank you for your attention to this matter.

Here are the related code snippets:

static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
  (void)ud; (void)osize;  /* not used */
  if (nsize == 0) {
    free(ptr);
    return NULL;
  }
  else
    return realloc(ptr, nsize);
}


LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
  int i;
  lua_State *L;
  global_State *g;
  LG *l = cast(LG *, (*f)(ud, NULL, LUA_TTHREAD, sizeof(LG)));
  if (l == NULL) return NULL;
...
}

Best Regards.
Sunshilong