Electrical computers and digital data processing systems: input/ – Input/output data processing – Input/output command process
Reexamination Certificate
2011-03-15
2011-03-15
Hafiz, Tariq (Department: 2182)
Electrical computers and digital data processing systems: input/
Input/output data processing
Input/output command process
C710S006000, C710S007000, C710S036000, C710S015000, C710S016000, C710S017000, C710S018000, C710S019000
Reexamination Certificate
active
07908403
ABSTRACT:
A computer program product, an apparatus, and a method for reducing reserved device access contention at a control unit in communication with a plurality of operating systems via one or more channels are provided. The computer program product includes a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method that includes receiving a command message at the control unit from a first operating system, including an I/O operation command for a device. A device busy indicator is received, indicating that a second operating system has reserved the device. The command message is queued on a device busy queue in response to the device busy indicator. The control unit monitors for a device end indicator. The device busy queue is serviced to perform the I/O operation command in response to the device end indicator.
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“IBM® z/Archit
Bendyk Mark P
Casper Daniel F
Flanagan John R.
Hardy Clint A.
Hathorn Roger G.
Campbell John
Cantor & Colburn LLP
Hafiz Tariq
International Business Machines - Corporation
Lewis-Taylor Dayton
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