    OVS_REQ_WRLOCK(ct->resources_lock)
{
    alg_exp_node->expiration = now + CT_ALG_EXP_TIMEOUT;
    ovs_list_push_back(&ct->alg_exp_list, &alg_exp_node->exp_node);
}
    OVS_REQ_WRLOCK(ct->resources_lock)
{
    alg_exp_node->expiration = now + CT_ALG_EXP_TIMEOUT;
    ovs_list_push_back(&ct->alg_exp_list, &alg_exp_node->exp_node);
}