saving state

[Enno Rehling <enno@...>]

I want to use lua to create a game. NPCs for example will be running lua 
scripts, and events will also be scripted. I'm thinking of implementing the 
scripts as coroutines that yield whenever they've done the amount of work 
they want to do during one frame of the game's engine. That way, I only have 
one lua_State object, and I can call the script engine once per frame, and 
return back to C.

One difficulty I have is that I need to save the current state of the 
scripts when the player is saving the game. Given my current lua_State 
object, I'd like to be able to serialize it to disk together with the rest 
of my savegame data.

Has anyone written something like this before? I've looked through the lua 
code this morning before breakfast - it looks like recreating the state 
object, and registering everything in the right places, is a bit of an 
adventure, and if anyone has gone that way before, I'd like to not reinvent 
that particular wheel :-)

Enno.