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Patent Title: Method and system for predefined suspension and resumption control over I/O programs

Assignee: IBM
Patent Number: US5613163
Issue Date: 03-18-1997
Application Number:
File Date:11-18-1994

Abstract: Execution of input/output operations is controlled by one or more suspend and/or resume mechanisms. Suspension of an input/output operation is accomplished by one of a number of mechanisms including, for instance, a START SUBCHANNEL instruction with execution limits, a SUSPEND SUBCHANNEL instruction with or without a suspension time limit, or a suspend subchannel channel command word with or without a suspension time limit. Subsequent to suspending execution of a channel program, execution can be resumed automatically or by issuing a RESUME SUBCHANNEL instruction with limits or a resume subchannel channel command word with limits.


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