[Stackless] Basic stackless embedding

Andrew Macentire amacentire at ymail.com
Mon Jan 17 17:18:21 CET 2011

Hello! I'm new to the field and I was trying a simple stackless embedding test and experienced problems.Here is the short source code to my test:

#include <stackless_api.h>
#include <windows.h>
int main(void)
PyInterpreterState* pys;
PyRun_SimpleString("import stackless");
PyRun_SimpleString("print stackless.runcount");
PyRun_SimpleString("print stackless.getcurrent()");
PyObject *task;
task=PyStackless_GetCurrent();    //  <==== CRASH HERE
return 1;

I am using MSVC 8 and an unmodified distribution of Python 2.7.1 Stackless 3.1b3 060516,
built with the same compiler.
The crash happens inside PyStackless_GetCurrent, which looks like this:

PyObject *
    PyThreadState *ts = PyThreadState_GET();
    PyObject *t = (PyObject*)ts->st.current;

    return t;

The crash happens on Py_INCREF(t), because the thread state object returned by PyThreadState_GET
doesn't seem to be properly initialized.
I'm probably missing something very basic, but any help is appreciated.


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