On 12/10/2016 07:53 PM, Paul Gilmartin wrote:
> I understand that the TOD clock continues to be updated during that spin.
> Are processes otherwise quiesced or may they continue to execute until
> they do (e.g.) STCK?
> What happens to the clock comparator and to other STIMER-queued events?
> Someone may want to wait for two seconds physical time; someone else may
> want to wait until two seconds after midnight.

All CPUs are interrupted to process the external interrupt for the leap
second change.

The leap second change is applied to TOD (LT) and GMT real/wait TQEs.

George Kozakos
z/OS Software Service, Level 2 Supervisor

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