Repost: Problem with Embedded Call

[Yogi Parish]

Yogi Parish wrote:

> Hello all,
>
> I have a problem with a program that calls a python routine many times
> over and over again.
> Unfortunately, after some time, there seem to be problems that are
> somehow to the reference count
> management. The routine runs satisfactory ca. 1000 times and then fails
> at various points.
>
> I would be happy if somebody could help me out with the following
> code...
>
> /**** BEGIN SNIPPET *****/
>
> PyInitialize()  <-- done elsewhere
>
>  PyObject *pmod = NULL, *pfunc = NULL;
>  PyObject *ppar = NULL, *pargs = NULL;
>
>   pmod = PyImport_ImportModule("testmodule");
>   pfunc = PyObject_GetAttrString(pmod, "testfunction");
>
> float x=0.0, y=1.0;
> pargs = Py_BuildValue("ff", x, y); // Build the args
>
>  ppar  = PyObject_CallObject( pfunc, pargs );
>
>  if (ppar==NULL) {
>   fprintf( file, "ppar is NULL %d \n",counter++);
>  }
>
> if (PyArg_Parse(ppar, "(ff)", &x, &y ) == 0 )
>   fprintf ( file, "PyArgParse Problem\n");
>
>  Py_XDECREF(pargs);
>  Py_XDECREF(ppar);
> // Py_XDECREF(pfunc);
> // Py_XDECREF(pmod);  No effect on the program if those two lines are
> uncommented or not
>
> /*** END SNIPPET ***/
>
> This part of the routine (part of a calculation) runs ok for many
> passes, but after some
> time pfunc is not callable and the PyObject_CallObject returns
> NULL (obviously). The rest of the code should be OK.
>
> I have tried every combination of DECREFs I could think of... Can
> anybody
> point towards the light?
>
> thank you very much for help
> yp