Multi Threading embedded python

[amit]

Hello,

 I am embedding a python script in a C++ application. The script can be 
called simultaneously from multiple threads.

What is the correct way to implement this situation:

1) Have unique python interpreter instantiations ( Py_Initialize() ) for 
each thread.

2) Have one python interpreter, and implement a lock on it so it can't 
be called simultaneously by multiple threads?

Thanks
   Amit