Cancel instruction and command for determining the state of an I/O operation
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United States of America Patent
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Apr 24, 2012
Grant Date -
Aug 20, 2009
app pub date -
Feb 14, 2008
filing date -
Feb 14, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
The state of an input/output (I/O) operation is determined in an I/O processing system. A command is received from an I/O operating system at a channel subsystem for initiating the I/O operation, a time period is for completion of the I/O operation, and the command for initiating the I/O operation is sent from the channel subsystem to the control unit. Responsive to the time period nearing elapsing without the I/O operation completing, a cancel instruction is received from the I/O operating system at the channel subsystem. Responsive to a determination by the I/O operating system to interrogate the control unit, an instruction to interrogate the control unit is received with the cancel instruction from the I/O operating system.
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