Re: [ANNOUNCE] Objective Lua

[Mark Hamburg <mark@...>]

On Oct 5, 2009, at 6:15 PM, E. Wing wrote:

> Meanwhile, I patched the existing legacy bridge to be garbage
> collection aware and fixed up some major memory leaks.

Dueling garbage collectors are generally a pain. On Lightroom, we  
found it advantageous to be using the reference counted version of  
Objective-C with Lua's garbage collector. Did you actually come up  
with a reasonable way to handle the Lua object A points to Objective-C  
object B which points to Lua object A case? In a simple dual GC  
implementation (e.g., using refs or the equivalent to refer to Lua  
objects), the objects end up as roots because of the foreign  
references and the collectors end up waiting for the other to go first  
in breaking the cycle. Lightroom uses the reference count information  
to detect when the only reference to an Objective-C object is from the  
Lua side and change its handling at that point.

Mark