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Asynchronous command support for shared channels for a computer complex having multiple operating systems

  • US 5,452,455 A
  • Filed: 06/15/1992
  • Issued: 09/19/1995
  • Est. Priority Date: 06/15/1992
  • Status: Expired due to Term
First Claim
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1. A method of reconfiguring an input/output subsystem shared by a plurality of control programs (OSs) in a computer electronic complex (CEC), each of said programs having a program identifier (IID), said method including the steps of:

  • providing a sharing set of input/output control blocks, each input/output control block of said sharing set including an input/output resource identifier for an input/output resource and a program identifier;

    storing said sharing set of input/output control blocks in said computer electronic complex;

    providing a configuration mask for establishing a reconfiguration of said input/output resource, said configuration mask including an image identifier field for identifying each of said plurality of programs;

    setting said image identifier field to a state that specifies an image identifier of a program;

    accessing said sharing set of input/output control blocks;

    setting a field in said sharing set of control blocks that corresponds to said image identifier field that has been set in the previous setting step;

    changing association of input/output resources in accordance with said configuration mask in each of said control blocks of said sharing set of input/output control blocks that have a field in the just previous setting step.

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