void oprofile_stop(void)
{
        down(&start_sem);
        if (!oprofile_started)
                goto out;
        oprofile_ops->stop();
        oprofile_started = 0;
        /* wake up the daemon to read remainder */
        wake_up_buffer_waiter();
out:
        up(&start_sem);
}

void oprofile_shutdown(void)
{
        down(&start_sem);
        sync_stop();
        if (oprofile_ops->shutdown)
                oprofile_ops->shutdown(); 
        is_setup = 0;
        free_event_buffer();
        free_cpu_buffers();
        up(&start_sem);
}