SOCK_USE_WRITE_QUEUE
if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);