_once
_once(&dl_phdr_info_once, dl_init_phdr_info);
_once(&dl_phdr_info_once, dl_init_phdr_info);
int _once(pthread_once_t *, void (*)(void));
_once(&once_control, init_key);
_once(&once_control, init_key);
_once(&once_control, init_key);
_once(&once_control, init_key);
_once(&exit_mutex_once, exit_mutex_init_once);
_once(&rand3_state_once, initialize_rand3);
_once(&rand3_state_once, initialize_rand3);
_once(&aux_vector_once, init_aux_vector_once);