Function channel_fops_poll

components/lwp/lwp_ipc.c:1012–1034

for fops */

/* for fops */
static int channel_fops_poll(struct dfs_file *file, struct rt_pollreq *req)
{
    int mask = POLLOUT;
    rt_channel_t ch;
    rt_base_t level;

    ch = (rt_channel_t)file->vnode->data;

    level = rt_spin_lock_irqsave(&ch->slock);
    rt_poll_add(&(ch->reader_queue), req);
    if (ch->stat != RT_IPC_STAT_IDLE)
    {
        rt_spin_unlock_irqrestore(&ch->slock, level);
        return mask;
    }
    if (!rt_list_isempty(&ch->wait_msg))
    {
        mask |= POLLIN;
    }
    rt_spin_unlock_irqrestore(&ch->slock, level);

    return mask;
}

static int channel_fops_close(struct dfs_file *file)
{