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Protecting duplicate/lost updates against host failures

  • US 6,701,330 B1
  • Filed: 12/30/1997
  • Issued: 03/02/2004
  • Est. Priority Date: 12/30/1997
  • Status: Expired due to Fees
First Claim
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1. In a data processing system having a number of users coupled to a number of hosts, the number of hosts coupled to a common memory and executing a concurrent application, each one of a number of user sessions corresponding to a one of the number of users communicating with a one of the number of hosts executing the concurrent application, the one of the number of users communicating with the one of the number of hosts by sending a number of messages to and receiving the number of messages from the one of the number of hosts, the improvement comprising:

  • a. counting means coupled to the number of hosts for counting the number of messages, said counting means counting the number of messages for the corresponding one of the number of user sessions;

    b. incrementing means coupled to said counting means for incrementing said counting means when the concurrent application creates a one of the number of messages to be sent to the corresponding one of the number of users; and

    c. decrementing means coupled to said counting means for decrementing said counting means when the one of the number of messages is released to the corresponding one of the number of users.

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