On 15 Dec 2014, at 19:19, Maxthon Chan <m...@maxchan.info> wrote:
> My current design is that the main code is never possible of holding strong 
> references to plugin code for extended periods. Main code keeps an eye on a 
> folder and whenever a new bundle is dropped in it is loaded, and whenever a 
> bundle is removed code is unloaded. Class walking is used to detect the 
> classes loaded. Also, SKFormat does not have any instance methods, only class 
> methods, just to prevent any autorelease pool holding onto it.

 That's not enough. For instance, any constant strings in your plug-in get 
unloaded, whether someone outside it still has a reference to that string or 
not. I think there's a flag to avoid constant strings when building a plugin, 
but AFAIK there are other reasons that cause similar issues.

 Have you thought about making your plug-ins separate processes that 
communicate via pipes or Mach messages or similar mechanisms?
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