struct rtavl_node *s;
int j = k++;

for (;;)
  {
    da[k] = 1;
    pa[k++] = r;
    s = r->rtavl_link[1];
    if (s->rtavl_rtag == RTAVL_THREAD)
      break;

    r = s;
  }

da[j] = 0;
pa[j] = pa[j - 1]->rtavl_link[da[j - 1]] = s;

if (s->rtavl_link[0] != NULL)
  r->rtavl_link[1] = s->rtavl_link[0];
else
  {
    r->rtavl_rtag = RTAVL_THREAD;
    r->rtavl_link[1] = s;
  }

s->rtavl_balance = p->rtavl_balance;
s->rtavl_link[0] = p->rtavl_link[0];
s->rtavl_link[1] = p->rtavl_link[1];
s->rtavl_rtag = p->rtavl_rtag;