The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 03, 1997
Filed:
Dec. 15, 1993
Beth A Glendening, Poughkeepsie, NY (US);
Roger E Hough, Highland, NY (US);
Karen Udy, Wappingers Falls, NY (US);
Stephanie W Zhang, Binghamton, NY (US);
International Business Machines Corporation, Armonk, NY (US);
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.