Re: GPS Leap Second Scheduled!
Andrej Presern (andrejp@luz.fe.uni-lj.si)
Tue, 8 Sep 1998 22:27:28 +0200
On Mon, 07 Sep 1998, Ulrich Windl wrote:
>(...About leap second handling in the Linux kernel...)
>On 1 Sep 98, at 11:16, Sven Dietrich wrote:
>> The GPS control segment has posted a leap second warning for week number
>> 990, Day number 5, and thus it's official in GPS world,
>> that the leap second will take place 12/31/98...
>>
>> I am going to run simulations on NTP 3 & 4 and Linux with that GPS almanac.
>> Will send bug fixes and patches as needed for the Trimble refclocks and
>> NTP...
>>
>> Linux currently inserts a 2nd 59th second, instead of the UTC model of ...
>> 58, 59, 60...
>
>The time in the kernel is seconds since the epoch. To insert a second
>means that we'll have to delay the next second for another second.
>The other solution seems to be a clib -> kernel interface that knows
>that a leap second is active now. Then the clib could possibly
>convert the seconds to xx:yy:60. (I hope I did not overlook something
>obvious).
Have you considered simply not scheduling any processes for one second and
adjusting the time accordingly? (if one second chunk is too big, you can do it
in several steps)
Andrej
--
Andrej Presern, andrejp@luz.fe.uni-lj.si
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