Function sys_mb_create

components/lwp/lwp_syscall.c:2322–2356

* @brief Creates a mailbox for inter-thread or inter-process communication. * * This system call creates a mailbox object with the specified name and size. * The mailbox is used to exchange messages between threads or tasks in a * synchronized manner. The mailbox can be used to send and receive messages * of a specified size. * * @param[in] name A string representing the name of the mailbox

 * @see sys_mb_delete(), sys_mb_send(), sys_mb_recv()
 */
rt_mailbox_t sys_mb_create(const char *name, rt_size_t size, rt_uint8_t flag)
{
    int len = 0;
    rt_mailbox_t mb = RT_NULL;
    char *kname = RT_NULL;

    len = lwp_user_strlen(name);
    if (len <= 0)
    {
        return RT_NULL;
    }

    kname = (char *)kmem_get(len + 1);
    if (!kname)
    {
        return RT_NULL;
    }

    if (lwp_get_from_user(kname, (void *)name, len + 1) != (len + 1))
    {
        kmem_put(kname);
        return RT_NULL;
    }

    mb = rt_mb_create(kname, size, flag);
    if (lwp_user_object_add(lwp_self(), (rt_object_t)mb) != 0)
    {
        rt_mb_delete(mb);
        mb = NULL;
    }

    kmem_put(kname);

    return mb;
}

/**
 * @brief Deletes a mailbox object.