Method runInPython

src/EmbedPython/EmbeddedPython.cpp:379–451

run interpreter without initiating/locking/unlocking GIL in a single thread at a time

// run interpreter without initiating/locking/unlocking GIL 
// in a single thread at a time
QVariant EmbeddedPython::runInPython(const QString &mname, 
                                     const QString &fname, 
                                     const QVariantList &args, 
                                     int *rv, 
                                     QString &tb,
                                     bool ret_python_object)
{
    EmbeddedPython::m_mutex.lock();
    PyGILState_STATE gstate = PyGILState_Ensure();
    QVariant  res        = QVariant(QString());
    PyObject *moduleName = NULL;
    PyObject *module     = NULL;
    PyObject *func       = NULL;
    PyObject *pyargs     = NULL;
    PyObject *pyres      = NULL;
    int       idx        = 0;

    moduleName = PyUnicode_FromString(mname.toUtf8().constData());
    if (moduleName == NULL) {
        *rv = -1;
        goto cleanup;
    }

    module = PyImport_Import(moduleName);
    if (module == NULL) {
        *rv = -2;
        goto cleanup;
    }

    func = PyObject_GetAttrString(module,fname.toUtf8().constData());
    if (func == NULL) {
        *rv = -3;
        goto cleanup;
    }

    if (!PyCallable_Check(func)) {
        *rv = -4;
        goto cleanup;
    }

    // Build up Python argument List from args
    pyargs = PyTuple_New(args.size());
    idx = 0;
    foreach(QVariant arg, args) {
        PyTuple_SetItem(pyargs, idx, QVariantToPyObject(arg));
        idx++;
    }

    pyres = PyObject_CallObject(func, pyargs);
    if (pyres == NULL) {
        *rv = -5;
        goto cleanup;
    }

    *rv = 0;

    res = PyObjectToQVariant(pyres, ret_python_object);