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Mechanism for fail-over notification

  • US 5,117,352 A
  • Filed: 10/20/1989
  • Issued: 05/26/1992
  • Est. Priority Date: 10/20/1989
  • Status: Expired due to Term
First Claim
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1. A method for providing failure notification in a computer network having a plurality of nodes wherein a predetermined number of the nodes are each processing one part of an application program, which method comprises the steps of:

  • for each part o the application program, making a first request for an exclusive access privilege to a preselected resource name;

    for each part of the application program, making a second request for a preselected access privilege to a corresponding resource name having a name based upon the respective part;

    granting the first request for an exclusive access privilege to one and only one part of the application program;

    granting the second request to each part of the application program;

    making a third request on behalf of the one and only one part of the application program for each resource name having a name based upon a respective part of the application program other than the one and only one part;

    said third request being for an access privilege that is incompatible with each second request;

    operating the computer network to;

    (i) store information on each third request for a resource having a name based upon a respective part of the application program other than the one and only one part, and(ii) upon a failure of one node of the predetermined number of nodes processing one part of the application program, automatically invalidating the second request of a respective part being processed on the failed node and automatically granting the third request made on behalf of the one and only one part of the application program for the resource name having a name based upon the respective part being processed on the failed node; and

    utilizing the grant of the third request for the resource name having a name based upon the respective part being processed on the failed node to cause a message to be generated to identify the respective part being processed on the failed node.

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