Inconsistent behaviour with respect to the ticks in the *_when() directives

[Gedare Bloom]

On Fri, May 14, 2021 at 12:26 AM Sebastian Huber
<sebastian.huber at embedded-brains.de> wrote:
>
> Hello,
>
> I noticed that we have an inconsistent behaviour with respect to the
> handling of the ticks member in the *_when() directives. In all *_when()
> directives the ticks member is not used to calculate the watchdog
> expiration time, see also:
>
> https://lists.rtems.org/pipermail/users/2020-December/068006.html
>
> However, the rtems_task_wake_when() directive ignores the ticks member
> of the time of day completely, unlike the rtems_timer_fire_when() and
> rtems_timer_server_fire_when() directives which check that the ticks are
> valid and then ignore them.
>
> We should use a common way to deal with the ticks member. If we ignore
> the value, then this would make it more difficult to support it in the
> future. The watchdog implementation supports a nanoseconds resolution.
> If we check the ticks in rtems_task_wake_when() existing applications
> may get an error status after the change.
>
I'm in favor of making the behavior consistent and future-looking.
Let's validate the ticks parameter but not use it. Recommend that
users set it to 0? That allows a future modification to use it with
fewer surprises.

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