Rate Monotonic Manager

Gedare Bloom gedare at rtems.org
Tue Oct 11 00:44:36 UTC 2016

Nothing jumps out at me. The code at first glance looks correct. What
version of RTEMS and what BSP are you using? How do you determine that
2 seconds elapse between periods? Can you attach a debugger and see
how the value of the _Watchdog_Ticks_since_boot is progressing?


On Sun, Oct 9, 2016 at 11:56 AM, Agostino Mascitti
<agostino.mascitti at student.univaq.it> wrote:
> Dear all,
> I am trying to understand the Rate Monotonic Manager. I think I am not
> understanding something.
> As you can see in the attached file, I defined
> #define CONFIGURE_MICROSECONDS_PER_TICK     1000000 /* Every 1 sec a tick */
> and I would like a task to be executed every 4 seconds:
> rtems_rate_monotonic_period(periodid, 4);
> The strange thing is that the task is executed every 2 seconds.
> I read the user guide and, as I understand, in the first iteration of the
> while loop rtems_rate_monotonic_period should not block. In the second
> iteration, instead, it should block for 4 sec minus the time used to perform
> the periodic actions. When this time expires, the 4 seconds period should
> start another time.
> Could anybody say to me what I am not understanding well please?
> Thank you another time,
> Agostino
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