Hello,
for every module Cython generates "runtime support code" that is place
at the end of the converted file. Each one of those has an
__Pyx_Import function that gets called from
PyMODINIT_FUNC init$MODULENAME(void)
static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list) {
PyObject *__import__ = 0;
PyObject *empty_list = 0;
PyObject *module = 0;
PyObject *global_dict = 0;
PyObject *empty_dict = 0;
PyObject *list;
__import__ = PyObject_GetAttrString(__pyx_b, "__import__");
if (!__import__)
goto bad;
if (from_list)
list = from_list;
else {
empty_list = PyList_New(0);
if (!empty_list)
goto bad;
list = empty_list;
}
global_dict = PyModule_GetDict(__pyx_m);
if (!global_dict)
goto bad;
empty_dict = PyDict_New();
if (!empty_dict)
goto bad;
module = PyObject_CallFunction(__import__, "OOOO",
name, global_dict, empty_dict, list);
bad:
Py_XDECREF(empty_list);
Py_XDECREF(__import__);
Py_XDECREF(empty_dict);
return module;
}
In that function PyMODINIT_FUNC init$MODULENAME(void) we also call
__Pyx_ImportType quite often:
static PyTypeObject *__Pyx_ImportType(char *module_name, char
*class_name,
long size)
{
PyObject *py_module_name = 0;
PyObject *py_class_name = 0;
PyObject *py_name_list = 0;
PyObject *py_module = 0;
PyObject *result = 0;
py_module_name = PyString_FromString(module_name);
if (!py_module_name)
goto bad;
py_class_name = PyString_FromString(class_name);
if (!py_class_name)
goto bad;
py_name_list = PyList_New(1);
if (!py_name_list)
goto bad;
Py_INCREF(py_class_name);
if (PyList_SetItem(py_name_list, 0, py_class_name) < 0)
goto bad;
py_module = __Pyx_Import(py_module_name, py_name_list);
if (!py_module)
goto bad;
result = PyObject_GetAttr(py_module, py_class_name);
if (!result)
goto bad;
if (!PyType_Check(result)) {
PyErr_Format(PyExc_TypeError,
"%s.%s is not a type object",
module_name, class_name);
goto bad;
}
if (((PyTypeObject *)result)->tp_basicsize != size) {
PyErr_Format(PyExc_ValueError,
"%s.%s does not appear to be the correct type object",
module_name, class_name);
goto bad;
}
goto done;
bad:
Py_XDECREF(result);
result = 0;
done:
Py_XDECREF(py_module_name);
Py_XDECREF(py_class_name);
Py_XDECREF(py_name_list);
return (PyTypeObject *)result;
}
As one can see certain PyObject have refcounts greater 0 when
initialization is successful. But I cannot find a cleanup function
that would decrease the reference count upon exit. Consequently
python's garbage collector never frees those dictionaries, which in
most cases doesn't matter because we are exiting python anyway [some
people claim that one shouldn't care about still reachable memory,
because cleaning it up the nice way just slows down the termination of
a process because the system will reap the heap and stack
automatically]. But it pollutes the memcheck log, which is why I care
about this.
The usual way to call those functions for each module would be to
register an atexit function, see
http://docs.python.org/lib/module-atexit.html
So if anybody want to write am autogenerated cleanup function for
Cython and register it via atexit that person would be very welcome :)
Cheers,
Michael
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