Re: Multiple functions: was the gc

[David Jones <drj@...>]

On 22 Aug 2006, at 02:25, D Burgess wrote:

> OK, David Jones was right (thank you) and I made an incredibly
> silly assumption. If I might restate the problem:
>
> I have a number of Lua threads that each have their own environment,
> I have *a* function which will execute in each of the threads,
> I wish to set the function environment (lua_setfenv()) of the function
> to the thread environment.
> How do I do this without doing a lua_load() for *each* thread?
> Is there anyway (from C) having initially loaded the function to
> create a separate closure for each thread?

I was going to spend some more time looking at this, but I see you've  
made some progress before I found the time.

If the function you want to execute _is_ the entire script loaded by  
lua_load then you can't do what you want.  You must use lua_load to  
get a fresh instance of the function (this is a small drawback in Lua  
I think).

However, I think wrapping your scripts should work:
return function(...)
-- original script goes here
end

Then, you can lua_load the script once and lua_call it each time you  
want a fresh function instance.  That'll be dead fast.

If you don't want to edit all your scripts, you should be able to use  
a custom loader to add the "return function(...)" prefix and the  
"end" suffix.

drj


> David Burgess
>
> David Jones wrote:
> > > Isn't this explained by there only being one function that is  
> > shared
> > > by all your threads?