[PATCH 8/8] score: Replace watchdog handler implementation

[Sebastian Huber]

On 03/03/16 23:44, Joel Sherrill wrote:
>
>     >
>     > "be placed on Red-Black Trees for set management." copy-pasted
>     comment
>     > should be Chains?
>
>     Thanks, for spotting this.
>
>     >
>     > "watchdog is scheduled and a black node". ditto, black should be red
>     > for the second one.
>
>     Oh, yes.
>
>     >
>     > _Watchdog_Ticks_from_seconds(): why is ticks = seconds<<30 the right
>     > thing to do? Same for _Watchdog_Ticks_from_timespec(). I am missing
>     > some assumption here, I guess. It might improve readability to
>     provide
>     > a helper function for this.
>
>     Ok, sorry for the magic numbers.  2**30 == 1073741824 enough to
>     cope with 1e9 nanoseconds.  So, we have 2**34 seconds available,
>     leading to a year 2514 problem.
>
>
> That's pretty close to the 2^64 nanosecond limit as I recall. So 
> reasonable but
> I suppose that should be very explicit somewhere in a comment.
>
> Funny, before there was a wiki, we had a FAQ document which had a 
> section on
> date/time overflow issues. We probably need a section in the users 
> manual with
> the current truth on this:
>
> https://docs.rtems.org/releases/rtemsdocs-4.6.4/share/rtems/html/FAQ/FAQ00100.html
>
> We have multiple date/time and interval representations in the score, 
> classic and
> POSIX APIs. It would be good to capture them again.

Yes, this is on my TODO list along with the year 2038 problem.

-- 
Sebastian Huber, embedded brains GmbH

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