Function sys_mq_urgent

components/lwp/lwp_syscall.c:2739–2766

* @brief Sends an urgent message to a message queue. * * This system call sends a message to the specified message queue with higher priority, * meaning it will be placed at the front of the queue, bypassing normal message * order. The message is copied into the queue's buffer. If the queue is full, * the behavior will depend on the flags set during queue creation (e.g., whether * it is bloc

 *          calling task or thread to block indefinitely if not properly handled.
 */
sysret_t sys_mq_urgent(rt_mq_t mq, void *buffer, rt_size_t size)
{
    int ret = 0;
    void *kbuffer = RT_NULL;

    if (!lwp_user_accessable((void *)buffer, size))
    {
        return -EFAULT;
    }

    kbuffer = kmem_get(size);
    if (kbuffer == RT_NULL)
    {
        return -ENOMEM;
    }

    if (lwp_get_from_user(kbuffer, buffer, size) != size)
    {
        kmem_put(kbuffer);
        return -EINVAL;
    }

    ret = rt_mq_urgent(mq, kbuffer, size);

    kmem_put(kbuffer);

    return ret;
}

/**
 * @brief Receives a message from a message queue.