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Method for keeping accurate time in a computer system

  • US 5,826,066 A
  • Filed: 08/08/1996
  • Issued: 10/20/1998
  • Est. Priority Date: 08/08/1996
  • Status: Expired due to Term
First Claim
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1. A method for maintaining the accuracy of a processor clock value according to an external clock value, the method including the steps of:

  • creating a rate variable that is proportional to a ratio of a chance of the processor clock value over a time period to a change of the external clock value over the time period;

    developing an updated rate variable from a ratio of a first difference between a present processor clock value and a last processor clock value and a second difference between a present external clock value and a last external clock value multiplied by the rate variable;

    saving the present external clock value as the last external clock value;

    saving the present processor clock value as the last processor clock valuessaving the updated rate variable as the rate variable; and

    periodically incrementing the processor clock value with a time value that is proportional to a passage of time since last incrementing the processor clock value modified by the rate variable.

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