Re: Is it valid to ref a function/table/userdata in a coroutine?
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- Subject: Re: Is it valid to ref a function/table/userdata in a coroutine?
- From: John Labenski <jlabenski@...>
- Date: Wed, 1 Dec 2010 10:02:24 -0500
On Wed, Dec 1, 2010 at 1:03 AM, Javier Guerra Giraldez
<javier@guerrag.com> wrote:
> On Wed, Dec 1, 2010 at 12:51 AM, John Labenski <jlabenski@gmail.com> wrote:
>> but what about refs to locals?
>
> a variable can be local. a value doesn't have scope.
>
> refs refer to values, not variables
If you look at the C code for the Lua function coroutine.create(fn),
you see that it uses lua_xmove() to transfer the coroutine's function
to the new state. This implies to me that there is some scope, between
lua_States, for at least function values and that perhaps they have to
be handled differently than when you are dealing with only one
lua_State. In other words, I will be refing them from the coroutine
state to the shared registry state and is that valid?
lbaselib.c from 5.1.4
static int luaB_cocreate (lua_State *L) {
lua_State *NL = lua_newthread(L);
luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1), 1,
"Lua function expected");
lua_pushvalue(L, 1); /* move function to top */
lua_xmove(L, NL, 1); /* move function from L to NL */
return 1;
}
Regards,
John