Proper use of wxPyBeginBlockThreads/wxPyEndBlockThreads

[Lanier, Paul]

I'm not sure what the proper use of
wxPyBeginBlockThreads/wxPyEndBlockThreads is.  I have a method (listed
below) that is creating and returning a python list.  From what I read
in the Wiki, I should be calling
wxPyBeginBlockThreads/wxPyEndBlockThreads if I am doing any manipulation
of Python objects.  However, if I uncomment these calls then I get a
consistent segfault when wxPyBeginBlockThreads is called.  The wrapper
statement from the .i is also listed below.  

So my question is: Do I need to wrap this code in
wxPyBeginBlockThreads/wxPyEndBlockThreads?

Any other comments on this are also welcome.  I'm new to messing with
Python stuff in C.

PyObject *wxPseudoDC::FindObjectsByBBox(wxCoord x, wxCoord y)
{
    //wxPyBlock_t blocked = wxPyBeginBlockThreads();
    PyObject* pyList = NULL;
    pyList = PyList_New(0);
<snip>
            PyObject* pyObj = PyInt_FromLong((long)obj->GetId());
            PyList_Insert(pyList, 0, pyObj);
            Py_DECREF(pyObj);
<snip>
    //wxPyEndBlockThreads(blocked);
    return pyList;
}

DocDeclStr(PyObject*, FindObjectsByBBox(wxCoord x, wxCoord
y),"<snip>","");