Re: state of the Lua nation on resource cleanup

[Mark Hamburg <mark@...>]

On Feb 19, 2009, at 7:25 AM, Roberto Ierusalimschy wrote:

> > > > Do upvalues get processed when a coroutine gets collected?
> > >
> > > Currently no.
> >
> > Does a closure keep the coroutine in which it was created from being
> > collected? If not, then isn't there a problem if upvalues don't get
> > closed when the coroutine gets collected? Or maybe we miscommunicated
> > since I failed to say "closed" in my earlier message.
>
> I understood what you said, the wrong answer was all my fault; sorry.
> upvalues *do* get closed when a coroutine gets collected (see
> 'luaE_freethread'). (Otherwise, as you said, there would be problems.)

So, a finalization design based on an extension to the upvalue  
mechanism would handle coroutines that will never be resumed, but not  
any more efficiently than the __gc methods on the corresponding items.

In other words, the design seems tenable but that leaves the question  
of whether it is worth the trouble.

Mark