pthread_attr_clone
error = pthread_attr_clone(&local_attr, attrp);
error = pthread_attr_clone(tcdp->tcd_attrp,
extern int pthread_attr_clone(pthread_attr_t *, const pthread_attr_t *);
error = pthread_attr_clone(&tpool->tp_attr, attr);
extern int pthread_attr_clone(pthread_attr_t *, const pthread_attr_t *);