Wrapping interdependent structures in Pyrex

I am trying to port some C code to Python using Pyrex. I am having a problem defining two structures. In this case, the structs were defined in terms of each other and Pyrex doesn't seem to handle the conflict. The structures look something like this:

typedef struct a {
    b * b_pointer;
} a;

typedef struct b {
    a a_obj;
} b;

      

        
        
        
      

    

They are located in different files. The code I'm using to wrap the structures looks like this:

def extern from "file.c": 
    ctypdef struct a: 
            b * b_pointer 
    ctypedef struct b: 
            a a_obj

      

        
        
        
      

    

File.c

is a separate file containing function definitions as opposed to structure definitions, but includes source files that define these structures. Is there a way to wrap both of these structures?