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> How about moving the data processing loop into Lua (for both the custom Lua 
> callbacks and any other C callbacks).
> while true do
>  local record = get_next_record()
>  if not record then return end
>  -- call call all c/lua per-record callbacks
>  for i=1,#callbacks do
>    callbacks[i](record)
>  end
>  -- cleanup record
>  cleanup_record(record)
> end
> If you are worried about the speed when not using LuaJIT, then have another 
> version of that loop written in C.

Yeah, we're looking at that as a solution, too, though it would involve rewriting a fair bit of existing C code in Lua.  I wanted to see if there were alternative suggestions before we went too far down that path.