What scripting language to use

[Carl Michaels <carlm@...>]

Hello,

I am starting a project and just wondering which scripting language I 
should use. Here's a list of things that I would like to have

- Ability to be used with a C++ engine
- Ease of copying a C++ class to a scripting class/object (ie I have a 
class that define the characteristics of a NPC, I want to easily be able 
to copy this class (at least its members) into the script, something like 
script object A = C Class Demon)
- Ability to stop a script at any time (ie after so many steps, or after a 
certain amount of time)
- Ability to split a script up into many smaller scripts (similar to the 
#include for c++)
- Any other nice features :)

I've looked at Lua and it seems to do many of the above requirements. 
Coroutines look like a solution but not exactly what I want. I think I 
also read somewhere about having multiple threads and stopping that 
(perhaps someone can give me a simple example).

If lua cannot do all of the above, then perhaps someone knows a scripting 
language that can like Perl or Scheme. Any insights is greatly 
appreciated.

Thanks,
Carl