Python extension module segmentation fault

Robert Kern robert.kern at gmail.com
Fri Oct 21 10:41:32 CEST 2005


Rolf Wester wrote:
> Hi,
> 
> I' trying to make an extension module that passes Numeric arrays. The
> wrapper function is (swig generated and modified by myself):
> 
> static PyObject *_wrap_my_func(PyObject *self, PyObject *args) {
>     PyObject * resultobj = 0 ;
>     PyObject * obj0 = 0 ;
>     PyArrayObject * mat = 0 ;
> 
> 	std::cout << __FILE__ << "  " <<  __LINE__ << std::endl;
>     if(!PyArg_ParseTuple(args,(char *)"O:my_func",&obj0)) goto fail;
> 	std::cout << __FILE__ << "  " <<  __LINE__ <<  "  " << obj0 << std::endl;
>  	mat = (PyArrayObject *) PyArray_ContiguousFromObject(obj0,
> PyArray_DOUBLE, 1, 1);
> 	std::cout << __FILE__ << "  " <<  __LINE__ <<  "  " << mat << std::endl;
> 
>     Py_INCREF(Py_None); resultobj = Py_None;
>     return resultobj;
>     fail:
>     return NULL;
> }
> 
> The shared object is build with:
> 
> g++ -c -g -fPIC -I./  -I/usr/local/include/python2.4
> -I/usr/local/include/python2.4/Numeric  mytest_wrap.cpp -o mytest_wrap.o
> 
> g++ -shared -L/usr/local/lib/python2.4/config/  mytest_wrap.o
> -lpython2.4 -lm   -o _mytest.so
> 
> 
> the Python file reads:
> 
> import _mytest
> from Numeric import *
> mat = ones(100,Float64)
> print _mytest.my_func(mat)
> 
> When running this I get the output:
> 
> mytest_wrap.cpp  1499
> mytest_wrap.cpp  1502  0x402b55e8
> Speicherzugriffsfehler (segmentation fault)

Did you call import_array() in init_mytest()?

-- 
Robert Kern
rkern at ucsd.edu

"In the fields of hell where the grass grows high
 Are the graves of dreams allowed to die."
  -- Richard Harter




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