FIRST_IN
ep = FIRST_IN(lock);
ep = FIRST_IN(lock);
for (ep = FIRST_IN(request); ep != HEAD(request); ep = NEXT_IN(ep)) {
ep = FIRST_IN(lock);
request->l_sedge = FIRST_IN(request);
lock->l_sedge = FIRST_IN(lock);
for (ep = FIRST_IN(vertex); ep != HEAD(vertex);
for (ep = FIRST_IN(vertex); ep != HEAD(vertex);
ep = FIRST_IN(lock);
ep = FIRST_IN(lock);
ep = FIRST_IN(lock);