Patent US5701446A successfully refreshed from Google Patents.
US5701446A
Expired / Lapsed
US
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Method for fine grain adjustments to system time in computer systems
Assignee: International Business Machines Corp
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Filing: 1995-06-09
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Granted: 1997-12-23
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Expires: 2015-06-09
Abstract
Abstract A method for performing fine grain time adjustments in computer systems. A fine grain time adjustment can be completed in the first interrupt instead of doing it piecewise over many interrupts. If the adjustment offset is less than or equal to a threshold, then the clock is adjusted in the first clock interrupt; if the adjustment offset is greater than the threshold, then the clock is adjusted over a number of interrupts with an adjustment by an amount equal to the threshold per interrupt.
Inventors
- 👤 Bulent Abali
- 👤 Ronald Mraz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:20
CPC Classifications
G; G06; G06F; G06F1/00; G06F1/04; G06F1/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
A method for adjusting system time in a computer system, comprising the steps of: (a) determining an adjustment amount D by which the time must be adjusted; (b) if the adjustment amount D is greater than or equal to a threshold value, incrementally adjusting the time, including the steps of: (b1) truncating the adjustment amount D to the nearest integral multiple of the threshold value; and (b2) repeating the following steps (b3)-(b4) until the adjustment amount D equals zero: (b3) adjusting the time by an amount equal to the threshold value; and (b4) reducing the adjustment amount D by an amount equal to the threshold value; and (c) if the adjustment amount D is less than the threshold value, adjusting the time by the threshold value in a single step.
Claim 2
Independent Claim
130 words
A method for adjusting system time in a computer system, comprising the steps of: (a) determining an adjustment amount D by which the time must be adjusted; (b) if the adjustment amount D is greater than or equal to a threshold value, incrementally adjusting the time, including the steps of: (b1) truncating the adjustment amount D to the nearest integral multiple of the threshold value; and (b2) repeating the following steps (b3)-(b4) until the adjustment amount D equals zero: (b3) adjusting the time by an amount equal to the threshold value; and (b4) reducing the adjustment amount D by an amount equal to the threshold value; and (c) if the adjustment amount D is less than the threshold value, adjusting the time by the threshold value in a single step.
Claim 3
Dependent Claim
25 words
The method of claim 1, wherein when the adjustment amount D is equal to the threshold value, the time is adjusted in a single increment.
Claim 4
Dependent Claim
15 words
The method of claim 1, wherein the threshold value is equal to about 1 millisecond.
Claim 5
Independent Claim
166 words
A method for adjusting system time in a computer system, comprising the steps of: (1) determining an adjustment amount D by which the time must be adjusted; (2) if the adjustment amount D is greater than or equal to a threshold value, incrementally adjusting the time, including the step of: repeating the following steps (a)-(d) until the adjustment amount D equals zero: (a) adjusting the time by an amount equal to the threshold value; (b) reducing the adjustment amount D by an amount equal to the threshold value; (c) if the adjustment amount D is now less than the threshold value, adjusting the time by an amount equal to the adjustment amount D, and setting the adjustment amount D equal to zero; and (d) if the adjustment amount D is greater than or equal to the threshold value, returning to step (a); and (3) if the adjustment amount D is less than the threshold value, adjusting the time by the threshold value in a single step.
Claim 6
Independent Claim
166 words
A method for adjusting system time in a computer system, comprising the steps of: (1) determining an adjustment amount D by which the time must be adjusted; (2) if the adjustment amount D is greater than or equal to a threshold value, incrementally adjusting the time, including the step of: repeating the following steps (a)-(d) until the adjustment amount D equals zero: (a) adjusting the time by an amount equal to the threshold value; (b) reducing the adjustment amount D by an amount equal to the threshold value; (c) if the adjustment amount D is now less than the threshold value, adjusting the time by an amount equal to the adjustment amount D, and setting the adjustment amount D equal to zero; and (d) if the adjustment amount D is greater than or equal to the threshold value, returning to step (a); and (3) if the adjustment amount D is less than the threshold value, adjusting the time by the threshold value in a single step.
References Cited (Backward Citations)
US4531185A
Cited
US4584643A
Cited
US4575848A
Cited
US5327468A
Cited
US5530846A
Cited
US5526515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-12-22 | 2001-06-23 | 2001-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-22 | 2005-06-23 | 2005-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-22 | 2009-06-23 | 2009-12-23 | $7700.00 | Window Closed / Lapsed |