Method and apparatus for generating a virtual clock in a data processing system
US6968473B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2001 |
| Grant date | Nov 22, 2005 |
| Priority date | — |
| Expiry date | Aug 20, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method, apparatus, and computer instructions for managing a set of virtual clocks in a data processing system with multiple partitions. A “set-time-of-day” command is used in connection with each virtual clock to define a basis for its local date/time state via the following elements: (1) a partition peculiar time base reference value, and (2) a partition peculiar time offset reference value which corresponds to the state of an elapsed time counter at the point in time when the time base reference value is established. The partition time base reference and offset reference values are stored in memory. When executing a “get-time-of-day” command, these are retrieved along with the current state of the elapsed time counter facility to compute the current date/time state of the virtual clock for the partition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.