if (th->th_unique == NULL) return TD_NOMSG;
td_thr_event_getmsg (const td_thrhandle_t *th, td_event_msg_t *msg){  td_eventbuf_t event;  LOG ("td_thr_event_getmsg");  /* Read the even structure from the target.  */  if (ps_pdread (th->th_ta_p->ph,		 ((char *) th->th_unique		  + offsetof (struct _pthread_descr_struct, p_eventbuf)),		 &event, sizeof (td_eventbuf_t)) != PS_OK)    return TD_ERR;	/* XXX Other error value?  */  /* Check whether an event occurred.  */  if (event.eventnum == TD_EVENT_NONE)    /* Nothing.  */    return TD_NOMSG;  /* Fill the user's data structure.  */  msg->event = event.eventnum;  msg->th_p = th;  msg->msg.data = (uintptr_t) event.eventdata;  /* And clear the event message in the target.  */  memset (&event, '\0', sizeof (td_eventbuf_t));  if (ps_pdwrite (th->th_ta_p->ph,		  ((char *) th->th_unique		   + offsetof (struct _pthread_descr_struct, p_eventbuf)),		  &event, sizeof (td_eventbuf_t)) != PS_OK)    return TD_ERR;	/* XXX Other error value?  */  return TD_OK;}