Function _bus_ring_space_nr

components/vbus/vbus.c:82–99

}

rt_inline int _bus_ring_space_nr(struct rt_vbus_ring *rg)
{
    int delta;

    rt_vbus_smp_rmb();
    delta = rg->get_idx - rg->put_idx;

    if (delta > 0)
    {
        /* Put is behind the get. */
        return delta - 1;
    }
    else
    {
        /* delta is negative. */
        return RT_VMM_RB_BLK_NR + delta - 1;
    }
}

struct rt_vbus_pkg {
    rt_uint8_t id;