Electrical computers and digital data processing systems: input/ – Input/output data processing – Input/output command process
Reexamination Certificate
2011-03-08
2011-03-08
Kindred, Alford W (Department: 2181)
Electrical computers and digital data processing systems: input/
Input/output data processing
Input/output command process
C710S003000, C710S004000, C710S020000, C711S001000, C711S100000, C711S101000
Reexamination Certificate
active
07904605
ABSTRACT:
A computer program product, apparatus, and method are provided for determining a state of an input/output (I/O) operation in an I/O processing system. A request from a channel subsystem is received at a control unit for performing the I/O operation. After a predetermined amount of time passes without the I/O operation completing, an interrogation request is received from the channel subsystem at the control unit for determining the state of the I/O operation. A response is sent from the control unit to the channel subsystem indicating the state of the I/O operation in response to the interrogation request. The response also includes information regarding a state of an I/O device executing the I/O operation and information indicating a state of the control unit controlling the I/O device executing the I/O operation.
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Carlson Scott M.
Casper Daniel F.
Flanagan John R.
Hathorn Roger G.
Huang Catherine C.
Campbell John
Cantor & Colburn LLP
International Business Machines - Corporation
Kindred Alford W
Unelus Ernest
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