CTRL_QUEUE
} ctrl_queue[CTRL_QUEUE];
catc->ctrl_tail = (catc->ctrl_tail + 1) & (CTRL_QUEUE - 1);
catc->ctrl_head = (catc->ctrl_head + 1) & (CTRL_QUEUE - 1);
catc->ctrl_tail = (catc->ctrl_tail + 1) & (CTRL_QUEUE - 1);