Function sys_sched_getparam

components/lwp/lwp_syscall.c:8835–8866

* @brief Retrieve the scheduling parameters of a specific thread. * * This function retrieves the scheduling parameters of the thread identified by the thread ID (`tid`). * The retrieved parameters are stored in the structure pointed to by the `param` argument. * * @param[in] tid The thread ID of the target thread whose scheduling parameters are to be retrieved. * @param[out] param A poin

 *       The exact structure and fields of `param` depend on the system's implementation and scheduling policies.
 */
sysret_t sys_sched_getparam(const pid_t tid, void *param)
{
    struct sched_param *sched_param = RT_NULL;
    rt_thread_t thread;
    int ret = -1;

    if (!lwp_user_accessable(param, sizeof(struct sched_param)))
    {
        return -EFAULT;
    }

    sched_param = kmem_get(sizeof(struct sched_param));
    if (sched_param == RT_NULL)
    {
        return -ENOMEM;
    }

    thread = lwp_tid_get_thread_and_inc_ref(tid);

    if (thread)
    {
        sched_param->sched_priority = RT_SCHED_PRIV(thread).current_priority;
        ret = 0;
    }

    lwp_tid_dec_ref(thread);

    lwp_put_to_user((void *)param, sched_param, sizeof(struct sched_param));
    kmem_put(sched_param);

    return ret;
}

/**
 * @brief Get the maximum priority for a given scheduling policy.