Re: Simulating Lua states in Lua with only 250 lines of code

[Philipp Janda <siffiejoe@...>]

Am 24.06.2015 um 01:51 schröbte Soni L.:
> > > and
> > >
> > > TValue l_registry;
> > >
> > > out of the global_State and into the lua_State.
> >
> > And then `io.open` wouldn't find its metatable when called from within
> > a coroutine, C libraries would be loaded and gc'd multiple times, etc.
> > ...
> How's that any different from creating multiple global states?

With multiple global Lua states

*   If you have `io.open`, you also have the FILE* metatable.
*   When the registry is collected and C libraries are unloaded, no 
function can run and call unloaded C functions (this is also a result of 
`dlopen`/`LoadLibrary` being reference counted).

Most of the current use of the registry (`_LOADED`, `CLIBS`, 
`luaL_checkudata`, `luaL_ref`) depends on the fact that there is only 
one registry in a global state.


Philipp