Embedding threaded Python in C

[Richard]

I've tried embedding Python in a C app so that Threading is done in the
Python side.

In the simple example below, unless I uncomment the ALLOW_THREADS macros,
the Python thread does nothing until the C for-loop finishes. 

My real-world example is a large C/Motif application - apart from scattering
the ALLOW_THREADS macros everywhere (and what do you do while the Motif
event loop is idling?), is there a better way to get the Python threads to
run?

I'm using Python-2.4 on Linux.

----------------------------------------------------------
/* app.c */

#include <stdio.h>
#include <Python.h>

void run_worker(void)
{
  PyObject *pmod;
  PyObject *pfunc;
  PyObject *pargs;
  PyObject *pres;

  pmod = PyImport_ImportModule("Manager");
  pfunc = PyObject_GetAttrString(pmod, "run");
  pargs = Py_BuildValue("()");
  pres = PyEval_CallObject(pfunc, pargs);
  Py_DECREF(pres);
  Py_DECREF(pfunc);
  Py_DECREF(pargs);
  Py_DECREF(pmod);
} 


int main(int argc, char **argv) 
{
  int  i;

  Py_Initialize();
  PyEval_InitThreads(); 
  PySys_SetArgv(argc, argv);

  run_worker();
  
  for (i=0; i<8; i++)
  {
    printf("%d main()\n", i); 
    
    /*Py_BEGIN_ALLOW_THREADS*/
    sleep(1);
    /*Py_END_ALLOW_THREADS*/
  }
  
  Py_Finalize();
}

----------------------------------------------------------
# Manager.py
import time
from threading import Thread, currentThread

class Worker(Thread):
    
    def run(self):
        for i in range(5):
            print "Worker.run() %d [%s]" % (i, currentThread().getName())
            time.sleep(1)

def run():
    w = Worker()
    w.start()

----------------------------------------------------------