Re: [PATCH 0/2][RFC] Potential fix for leapsecond caused futex issue (v2)

Posted Jul 2, 2012 16:27 UTC (Mon) by lindi (subscriber, #53135)
In reply to: Re: [PATCH 0/2][RFC] Potential fix for leapsecond caused futex issue (v2) by Baylink
Parent article: Re: [PATCH 0/2][RFC] Potential fix for leapsecond caused futex issue (v2)

The interface between Linux and applications is the gettimeofday system call. I believe it returned

1341100798
1341100799
1341100800
1341100800
1341100801

Isn't this exactly the correct behavior?

Re: [PATCH 0/2][RFC] Potential fix for leapsecond caused futex issue (v2)

Posted Jul 2, 2012 17:24 UTC (Mon) by Jonno (subscriber, #49613) [Link]

Yes, that is the correct behaviour of gettimeofday().

However, there was some internal kernel code that expected to be informed when the time of day and elapsed time wasn't continuous (done by calling clock_was_set()). The code for settimeofday() got this right, but the clock_was_set() call was missing from the leap second introducing code, leading to some trouble I don't really understand.