PFD_IS_ROOT
ASSERT(PFD_IS_ROOT(pfd_p));
if (PFD_IS_ROOT(pfd_p)) {
for (last_p = head_p; last_p && PFD_IS_ROOT(last_p);
if (!PFD_IS_ROOT(pfd_p)) {
for (rc_pfd_p = dq_head_p; PFD_IS_ROOT(rc_pfd_p);
if (PFD_IS_ROOT(rc_pfd_p) &&
for (pfd_p = impl.pf_dq_head_p; pfd_p && PFD_IS_ROOT(pfd_p);