METHODS OF FORECASTING MORTALITY USING AUSTRALIAN DATA
Transcript of METHODS OF FORECASTING MORTALITY USING AUSTRALIAN DATA
United States Patent [191 Hart
lllllllllllllllllllllllllllIllllIllllllllllllllIlllllllllllllllllllllllllll US005285528A
[11] Patent Number: 5,285,528 [45} Date of Patent: Feb. 8, 1994
[54] DATA STRUCTURES AND AIA'J‘ORITHMS FOR MANAGING LOCK STATES OF ADDRESSABLE ELEMENT RANGES
[75] Inventor: Caawall A. Hart, Millwood, N.Y.
[73] Assignee: International Business Machines Corporation, Armonk, NY.
[21] App]. No.: 660,451
[22] Filed: Feb. 22, 1991
[51] Int. Cl.5 ............................................ .. G06F 12/00 [52] U.S. Cl. ............................... .. 395/725; 364/2468;
364/2815; 364/D1G. 1; 364/9692; 364/D1G. 2
[58] Field of Search ............. .. 395/725, 650, 425, 325; 364/2468, 281.5, DIG. 1, 969.2, D16. 2
[56] References Cited U.S. PATENT DOCUMENTS
4,087,752 5/1978 Melvin ...................... ........ .. 325/30
4,480,304 10/1984 Carr et a1. . .. 395/725 4,574,350 3/1986 Starr ........ .. 395/725
4,709,326 11/1987 Robinson .... .. 395/725
4,716,528 12/1987 Crus et a]. . . . . . . . . . .. 395/650
4,763,244 8/ 1988 Meyer et al. . 364/200 4,766,537 8/1988 Zolnowsky .. 364/200 4,800,489 1/1989 Moyer et a1. .. .... .. 364/200
4,823,310 4/1989 Grand . . . . . . . . . . . . . . . . .. 364/900
5,060,144 10/1991 Sipple =1 a1. .... .. 395/650 5,089,952 2/1992 Bozman . . . . . . . . . . . . . .. 395/725
5,140,685 8/1992 Sipple et al. 395/425 5,161,227 11/1992 Dias et a1. .... .. 395/725
5,175,852 12/1992 Johnson et a1. ................... .. 395/600
OTHER PUBLICATIONS
"Operating Systems“; Lorin et al.; Addison-Wesley; 1981; Chapter 12.
"The UNIX Programming Environment"; Keringham et al.; Prentice Hall, Inc.; 1984. “An Introduction to Operating Systems"; Dietel; Ad dison-Wesley; 1984; Chapter 21. “An Introduction to Database Systems"; Date; vol. 1; 3rd Edition; Addison-Wesley; 1981. , “Data Structures and Program Design”; Kruse; 2nd edition; Prentice-Hall; 1984; p. 344. - “Locking Protocols for Concurrent Operations on B- Trees"; Bayer et al; IBM Technical Disclosure Bulletin; vol. 19; No. 10; Mar. 1977.
Primary Examiner-Michael R. Fleming Assistant Examiner-Glenn A. Auve Attorney. Agent, or Firm-Whitman & Marhoefer
[5 7] ABSTRACT An efficient algorithm for addressable element range locking in shared resources, such as tiles and memory, of a multi-tasking or multi-processor data processing system provides a very fast mechanism that can prop erly handle overlapping requests to lock ranges of data of the data processing system while locking or granting wait status to a requestor for any more of the shared resource than is actually requested. This is accom plished by providing singular descriptions of locked and requested ranges of addressable elements. As further requests are received or locks released on overlapping ranges of addressable elements, these singular descrip tions are divided or recombined into other singular descriptions of non-overlapping ranges. Problems of overlapping requests are thus handled by dynamically decomposing requests into non-overlapping segments which are then granted atomically. Fast searching for potential deadlocks is accomplished by placing control information about locked areas into a binary tree struc ture.
26 Claims, 19 Drawing Sheets
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US. Patent Feb. 8, 1994 Sheet 13 of 19 5,285,528
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US. Patent Feb. 8, 1994 Sheet 15 of 19 5,285,528
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U.S. Patent Feb. 8, 1994 Sheet 18 of 19 5,285,528
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US. Patent Feb. 8, 1994 Sheet 19 of 19 5,285,528
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RANGE_LENGTH PARENT_NODE
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SUBRANGE_START SUBRANGE_END
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