harold fellermann <harold@imb-jena.de> writes:

Hello,

I got your address from http://mail.python.org/pipermail/c++-sig/2002-June/001311.html -- so I don't know whether you are the right person to ask.

"We" are the right people to ask. You sent it to the appropriate place: c++-sig@python.org.

I think I have found an error in the boost.python's dict-interface.

My following code-snippet runs into segmantation fault:

#include <stdlib.h> #include <boost/python/dict.hpp>

using namespace boost::python;

int main() { dict x[750];

return 0; }

Do you really mean to construct an array of 750 dicts? I think if you're going to do that from a program (as opposed to an extension module) you'll need to call some things like PyInitialize() first. See libs/python/test/embedding.cpp for an example.

The problem seems to concern the garbage collector from the Python/C-API, as my debugger tells me, the program crashes in _PyObject_GC_New():

(gdb) run Starting program: /home/tsb/harold/c_network/pytest [New Thread 1024 (LWP 25905)]

Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 1024 (LWP 25905)] 0x0809a909 in PyErr_Occurred () (gdb) bt #0 0x0809a909 in PyErr_Occurred () #1 0x080addca in _PyObject_GC_New () #2 0x08064edc in PyDict_New () #3 0x4003b1f4 in boost::python::detail::dict_base::dict_base() () from /usr/local/lib/libboost_python.so.1.29.0 #4 0x080c6c6c in main () at pytest.c:9 #5 0x401744a2 in __libc_start_main () from /lib/libc.so.6

I tried this with a couple of python-objects and all containers (dict, list, ...) crashed in exactly the same way. Interestingly the program behaves normal when I reduce the number of objects within my array to approx. 700.

Very interesting, but inconclusive.

My configuration looks as follows: - python 2.2.1 (#1, Sep 10 2002, 17:49:17) - gcc 3.2 - boost version 1.29.0

Do you have any idea what is going on here? Is this a known bug, maybe even a nowadays fixed one? Or is it only a question of configuration? Any help will be appreciated!

It's hard to imagine any bug in Boost.PYthon that would depend on the size of the array being small; maybe one in the compiler or in Python could do that. This works on my system: #include <stdlib.h> #include <boost/python/dict.hpp> using namespace boost::python; void test() { // Initialize the interpreter Py_Initialize(); dict d[750]; } int main() { if (handle_exception(test)) { if (PyErr_Occurred()) PyErr_Print(); return 1; } return 0; } HTH, -- Dave Abrahams Boost Consulting www.boost-consulting.com