Function free_socket

components/net/at/at_socket/at_socket.c:322–378

}

static int free_socket(struct at_socket *sock)
{
    if (at_slock == RT_NULL)
    {
        /* create AT socket lock */
        at_slock = rt_mutex_create("at_slock", RT_IPC_FLAG_PRIO);
        if (at_slock == RT_NULL)
        {
            LOG_E("No memory for socket allocation lock!");
            return RT_NULL;
        }
    }

    rt_mutex_take(at_slock, RT_WAITING_FOREVER);
    if (sock->recv_notice)
    {
        rt_sem_delete(sock->recv_notice);
    }

    if (sock->recv_lock)
    {
        rt_mutex_delete(sock->recv_lock);
    }

    if (!rt_slist_isempty(&sock->recvpkt_list))
    {
        at_recvpkt_all_delete(&sock->recvpkt_list);
    }

    /* delect socket from socket list */
    {
        rt_base_t level;
        rt_slist_t *node = RT_NULL;
        struct at_socket *at_sock = RT_NULL;

        level = rt_hw_interrupt_disable();

        rt_slist_for_each(node, &_socket_list)
        {
            at_sock = rt_slist_entry(node, struct at_socket, list);
            if (at_sock && sock->socket == at_sock->socket)
            {
                if (at_sock->magic == AT_SOCKET_MAGIC)
                {
                    rt_slist_remove(&_socket_list, &at_sock->list);
                    break;
                }
            }
        }

        rt_hw_interrupt_enable(level);
    }

    rt_memset(sock, RT_NULL, sizeof(struct at_socket));
    rt_mutex_release(at_slock);
    return 0;
}