gil shit example

Единственное место вызова:
        std::cerr << "Run callback #" << number << std::endl;
        Callback(Object.get(), msg, sourceId, sessionId, level, number);
        std::cerr << "End callback #" << number << std::endl;

Переменные:
typedef void (*TLoggerCallback)(PyObject*, const std::string &msg, const std::string& sourceId, const std::string& sessionId, int level, int number);
typedef std::shared_ptr<PyObject> TPyObjectPtr;

const TCallback Callback;
const TPyObjectPtr Object;

Сам колбэк:
cdef void _logger_callback_thunk(PyObject* obj, const std::string &msg, const std::string& source_id, const std::string& session_id,
                                 int level, int number) with gil:
    print '_logger_callback_thunk: start '  + str(number)