Asynchronous command support for shared channels for a computer complex having multiple operating systems

US5452455A · kind A · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Miriam P. Brown · Poughkeepsie, US
• Richard Cwiakala · Wappingers Falls, US
• Kenneth J. Fredericks · Poughkeepsie, US
• Marten J. Halma · Poughquag, US
• David W. Hollar · Kingston, US
• Roger E. Hough · Austin, US
• Suzanne M. John · Poughkeepsie, US
• Assaf Marron · Ramat Gan, IL
• James C. Mazurowski · Poughkeepsie, US
• Kenneth J. Oakes · Wappingers Falls, US
• Charles E. Shapley · Salt Point, US
• Leslie W. Wyman · Poughkeepsie, US

Key dates

• Filing date: Jun 15, 1992
• Grant date: Sep 19, 1995
• Expiry date: Jun 15, 2012

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F13/10
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

This invention involves reconfiguration support for shared I/O resources in a a computer electronic complex (CEC) supporting both shared and unshared I/O channels of the type described and claimed in U.S. patent application Ser. No. 07/898,867 (PO9-92-016) filed on the same day as the subject application and assigned to the same assignee as the subject application. Prior channel subsystem call (CHSC) instructions cannot execute when a channel is to be configured as shareable by plural operating systems in a CEC.