V_id_bits
free(V_id_bits, M_IPID);
V_id_bits = new_bits;
} while (bit_test(V_id_bits, new_id) || new_id == 0);
bit_clear(V_id_bits, V_id_array[V_array_ptr]);
bit_set(V_id_bits, new_id);
free(V_id_bits, M_IPID);