Function sys_sched_setscheduler

components/lwp/lwp_syscall.c:8938–8968

* @brief Set the scheduling policy and parameters for a thread. * * This function sets the scheduling policy and associated parameters for the specified thread. * It allows controlling the scheduling behavior of threads. * * @param[in] tid The thread ID of the target thread. * @param[in] policy The scheduling policy to be applied. Common values include: * - `SCHED_FIFO`

 *       Ensure the `param` structure is properly initialized for the given `policy`.
 */
sysret_t sys_sched_setscheduler(int tid, int policy, void *param)
{
    sysret_t ret;
    struct sched_param *sched_param = RT_NULL;
    rt_thread_t thread = RT_NULL;

    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;
    }

    if (lwp_get_from_user(sched_param, param, sizeof(struct sched_param)) != sizeof(struct sched_param))
    {
        kmem_put(sched_param);
        return -EINVAL;
    }

    thread = lwp_tid_get_thread_and_inc_ref(tid);
    ret = rt_thread_control(thread, RT_THREAD_CTRL_RESET_PRIORITY, (void *)&sched_param->sched_priority);
    lwp_tid_dec_ref(thread);

    kmem_put(sched_param);

    return ret;
}

/**
 * @brief Get the scheduling policy of a thread.