System for synchronizing logical clock in logical partition of host processor with external time source by combining clock adjustment value with specific value of partition
US5636373A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1993 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | Dec 15, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/04
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An external time source is connected to a partitioned data processing system, having host processors controlled by a host hypervisor, and having operating systems in the partitions. The host processors each have a timer facility comprising a time-of-day (TOD) clock, and a clock comparator. When the hypervisor detects a need for synchronization between the external time source and a host timer facility, it insulates the operating system in the partition on that host from host synchronization, and synchronizes the host timer facility with the external time source. Subsequently, the operating system is placed into normal execution, with an adjustment value used for timer facility references, and with a synchronization interrupt pending if the operating system is aware of the external time source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.