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:
Jan. 31, 2012
Filed:
Feb. 14, 2008
Harry M. Yudenfriend, Poughkeepsie, NY (US);
Daniel F. Casper, Poughkeepsie, NY (US);
John R. Flanagan, Poughkeepsie, NY (US);
Matthew J. Kalos, Tucson, AZ (US);
Dale F. Riedy, Poughkeepsie, NY (US);
Louis W. Ricci, Hyde Park, NY (US);
Roger G. Hathorn, Tucson, AZ (US);
Gustav E. Sittmann, Tucson, AZ (US);
Ugochukwu C. Njoku, Yonkers, NY (US);
Catherine C. Huang, Poughkeepsie, NY (US);
Scott M. Carlson, Tucson, AZ (US);
Harry M. Yudenfriend, Poughkeepsie, NY (US);
Daniel F. Casper, Poughkeepsie, NY (US);
John R. Flanagan, Poughkeepsie, NY (US);
Matthew J. Kalos, Tucson, AZ (US);
Dale F. Riedy, Poughkeepsie, NY (US);
Louis W. Ricci, Hyde Park, NY (US);
Roger G. Hathorn, Tucson, AZ (US);
Gustav E. Sittmann, Tucson, AZ (US);
Ugochukwu C. Njoku, Yonkers, NY (US);
Catherine C. Huang, Poughkeepsie, NY (US);
Scott M. Carlson, Tucson, AZ (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A state of an input/output (I/O) operation in an I/O processing system is determined. A request for performing the I/O operation is received from an I/O operating system at a channel subsystem and forwarded to a control unit controlling an I/O device for executing the I/O operation. After a predetermined amount of time passes without receiving indication from the control unit that the I/O operation is completed, an interrogation request is received at the channel subsystem from the I/O operating system for determining the state of the I/O operation. An interrogation command is sent from the channel subsystem to the control unit. A response is received from the control unit, the response indicates a state of the I/O device executing the I/O operation, a state of the control unit controlling the I/O device executing the I/O operation, and the state of the I/O operation being executed.