(long unsigned int)data_list->size());
// TODO: add mutex to protect string_list while it's read and emptied
for(iter = data_list->begin(); iter != data_list->end(); iter++) {
(long unsigned int)data_list->size());
// TODO: add mutex to protect string_list while it's read and emptied
for(iter = data_list->begin(); iter != data_list->end(); iter++) {