On Fri, Jun 23, 2000 at 10:58:02AM -0400, Paul Jacyk wrote:
> Hi,
>
> In RTLinux 3.0pre6 the function usleep is now present in rti_sched.c. I
> was wondering what, if any, troubles there would be by the addition of a
> nanosleep function (see code based on usleep). It seems like there
> might be a hardware related resolution problem (ticks ?) or something
Basically, we don't see systems yet where nano means anything practical.
You could easily deifne
naonsleep(i) by usleep(i*1000) and not notice a difference.
Your version is fine too. PErhaps it would be smartfor us to redefine
usleep(i) as nanosleep(i/1000)
> else (time spent creating the new thread ?) that would make this
> approach a bad idea since the times could be much smaller than in
> usleep.
>
> just changed the line
> th->resume_time = gethrtime() + HRT_FROM_NS(interval * 1000);
> to
> th->resume_time = gethrtime() + HRT_FROM_NS(interval);
>
> int nanosleep (nanoseconds_t interval)
> {
> rtl_irqstate_t flags;
> pthread_t th = pthread_self();
> hrtime_t save_resume_time;
>
> rtl_no_interrupts (flags);
> save_resume_time = th->resume_time;
>
> th->resume_time = gethrtime() + HRT_FROM_NS(interval);
> th->state = RTL_THREAD_DELAYED;
> rtl_schedule_cancelable();
>
> th->resume_time = save_resume_time;
> rtl_restore_interrupts (flags);
> return 0;
> }
>
> Thanks,
> Paul
>
>
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