Re: Threads, tables and lua_ref.

[Sam Roberts <sroberts@...>]

On Tue, Apr 24, 2007 at 02:20:10PM -0700, Leandro Pelorosso wrote:
> Hi. I'm trying to create lots of threds and i'm having
> troubles. I was wondering if someone could help me.
> 
> If I'm going to create lots of threads I would like to
> keep their references somewhere else other than the
> stack. Where can I store them?. 

> I know i can do this: luaL_ref(L, LUA_REGISTRYINDEX )
> where L represents the new thread. But doing this i'm

Unless the new thread has itself on its stack (unlikely, unless you
called lua_xmove()), you should be using the "L" that was passed to
lua_newthread().

> using the registry table and i want to use a new table
> created by me. I'm having troubles creating a new
> table. I can't get the new table's index to use as
> luaL_ref parameter. 

  lua_newtable(L);
  int table_index = lua_gettop(L);
  lua_State* thread_L = lua_newthread(L);
  int thread_ref = luaL_ref(L, table_index);
  ... store the table at table_index somewhere?
}


{
  ...
  table_index = where was it stored?
  thread_ref = "" ?

  lua_rawgeti(L, table_index, thread_ref)
  lua_State* thread_L = lua_tothread(L, -1);

  ...


But you need to put the new table somewhere where you can find it, in
the registry, as a global, leave it on the stack, something, because
you'll need to supply an index to it before calling lua_rawgeti().

Why not just use the ref mechanism with the registry? The registry
exists pretty much as a convenient scratch table for this kind of thing.
Are you anticipating some kind of problem?

Sam