Detecting and accounting for unknown external interruptions in a computer program environment
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United States of America Patent
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Issued Date -
Jan 26, 2006
app pub date -
Jul 26, 2004
filing date -
Jul 26, 2004
priority date (Note) -
Abandoned
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Abstract
During the emulation of one computer operating system by a physical computer running another operating system, the occurrence of disruptive external events is detected and accounted for. A predetermined estimate of the work which should be necessary to process each emulated 'instruction' is entered into a lookup table. As the emulation program runs, the processing of each instruction includes the addition of work units to a running total of work units required to process a given batch of emulated instructions. A real time measure is also kept for the batch and is ordinarily used to update an accumulated total time measure for time accounting purposes except when external events occur which delay processing for some real, but unknown, amount of time. In this case, the real time measure is an inaccurate measure of work done, and the estimated work units is used to update the accumulated total time measure.
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