interfacing Python and Torch7(Lua) via shared library

Question

I am trying to pass data (arrays) between python and lua and I want to manipulate the data in lua using the Torch7 framework. I figured this can best be done through C, sin

Answer 1

The lua_gettop is a function defined in the Lua .so, which in your case must be luajit.so. Looks like you link your lib to it, that's good, and then you link main to your lib, so presumably the c compiler finds the Lua functions used by main in the luajit. So far so good.

Now when you load your lib via ctypes in python, does luajit lib automatically get loaded? You would expect it to, but you should confirm, maybe you have to tell ctypes to load linked libs. Another possibility is that ctypes or the lib loader does not find luajit, perhaps because it looks in places where luajit is not located. To be sure you might want to try putting all the libs in same folder from where you call Python.

If that doesn't help, try a variant of what you tried: don't load your module in python, just load luajit directly using ctypes, and try calling some of its methods.