Re: GPS Leap Second Scheduled!

H. Peter Anvin (hpa@transmeta.com)
9 Sep 1998 00:59:47 GMT

Followup to: <98090822315400.00819@soda>
By author: Andrej Presern <andrejp@luz.fe.uni-lj.si>
In newsgroup: linux.dev.kernel
>
> 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
>

The way xntp deals with leap seconds is it lets the epoch
float... i.e. it holds time_t to the same value for two seconds. One
proposal (which I like) was to compensate for this by allowing the
microsecond or nanosecond fields or struct timeval & co to advance to
1,999,999 µs or 1,999,999,999 ns in the case of such events. The neat
thing is that the latter number fits very nicely in a 32-bit integer
even if someone (mis-) interprets it as signed.

-hpa

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