PyGILState_Release + Python2.3 = Segmentation Fault

[cadavis2k2 at yahoo.com]

Kirill Simonov wrote:
> Hi,
>
> Could someone tell me why my extension module works under Python 2.4, but
> fails with Segmentation Fault under Python 2.3? Here is the stripped version:

Maybe Python threads aren't initialized? Adding a call to
PyEval_InitThreads() stops the seg fault for me in Python 2.3 on
Debian:

#include <Python.h>

static PyObject *
test_gil(PyObject *self)
{
    PyGILState_STATE gs;


    Py_BEGIN_ALLOW_THREADS


    gs = PyGILState_Ensure();


    PyGILState_Release(gs);


    Py_END_ALLOW_THREADS


    Py_INCREF(Py_None);
    return Py_None;
}


static PyMethodDef test_gil_methods[] = {
    {"test_gil", (PyCFunction)test_gil, METH_NOARGS},
    {NULL}


};


PyMODINIT_FUNC
init_test_gil(void) {

    /* This added */
    PyEval_InitThreads();

    (void)Py_InitModule("_test_gil", test_gil_methods); 
}