Function timer_create

components/libc/compilers/common/ctime.c:946–1044

* @brief Create a per-process timer. * * This API does not accept SIGEV_THREAD as valid signal event notification * type. * * See IEEE 1003.1 */

 * See IEEE 1003.1
 */
int timer_create(clockid_t clockid, struct sigevent *evp, timer_t *timerid)
{
    static int num = 0;
    int _timerid = 0;
    struct timer_obj *timer;
    char timername[RT_NAME_MAX] = {0};

    if (evp == RT_NULL || timerid == RT_NULL)
    {
        rt_set_errno(EINVAL);
        return -1;
    }

    if (evp->sigev_notify == SIGEV_THREAD)  // TODO need to implement
    {
        rt_set_errno(EINVAL);
        return -1;
    }

    switch (clockid)
    {
        case CLOCK_REALTIME:
        case CLOCK_REALTIME_ALARM:
        case CLOCK_MONOTONIC:
        case CLOCK_BOOTTIME:
        case CLOCK_BOOTTIME_ALARM:
        case CLOCK_PROCESS_CPUTIME_ID:
        case CLOCK_THREAD_CPUTIME_ID:
            break;  // Only these ids are supported
        default:
            rt_set_errno(EINVAL);
            return -1;
    }

    timer = rt_malloc(sizeof(struct timer_obj));
    if(timer == RT_NULL)
    {
        rt_set_errno(ENOMEM);
        return -1;
    }

    rt_snprintf(timername, RT_NAME_MAX, "psx_tm%02d", num++);
    num %= 100;
    timer->sigev_signo = evp->sigev_signo;
#ifdef RT_USING_SMART
    struct rt_work *work;
    struct rt_lwp *lwp = lwp_self();
    struct lwp_timer_event_param *param;
    param = rt_malloc(sizeof(struct lwp_timer_event_param));
    work = &param->work;

    if (!work)
    {
        rt_set_errno(ENOMEM);
        return -1;
    }

    if (lwp)