Boots – shoes – and leggings
Patent
1990-04-06
1994-03-08
Kulik, Paul V.
Boots, shoes, and leggings
395325, 395600, 395775, 3642468, 3649692, 364DIG1, G06F 1214, G06F 1216, G06F 938
Patent
active
052936007
ABSTRACT:
Methods and apparatus are set forth for improving the performance of general purpose computing systems that utilize exclusive and shared seize mechanisms to assure the integrity of shared data objects, records, or other unit of synchronization. More particularly, methods and apparatus are set forth which allow concurrent reads of shared data objects in a coherent fashion, without always having to perform a seize. According to a preferred embodiment of the invention, read (shared) accesses can be performed in such a manner as to improve system performance by utilizing a method comprising the steps of: (a) determining, for a particular shared data object to be read, if the object is subject to an exclusive seize prior to any attempt, to read the object; (b) reading the object without causing a shared seize to be initiated if it was not subject to an exclusive seize as determined in step (a); (c) determining if the object is subject to an exclusive seize after reading it in accordance with step (b); and (d) determining if the object was subject to an exclusive seize while it was being read. If, as a result of performing the aforestated method, it can be concluded that the read took place without an exclusive seize immediately before, during and just after the read, then the data can be presumed valid. System performance is improved in such cases since the overhead associated with initiating a seize for the read is eliminated.
REFERENCES:
patent: 4245306 (1981-01-01), Bessemer et al.
patent: 4253144 (1981-02-01), Bellamy et al.
patent: 4253146 (1981-02-01), Bellamy et al.
patent: 4399504 (1983-08-01), Obermarck et al.
patent: 4480304 (1984-10-01), Carr et al.
patent: 4604694 (1986-08-01), Hough
patent: 4627019 (1986-12-01), Ng
patent: 4742450 (1988-05-01), Duvall et al.
patent: 4897781 (1990-01-01), Chang et al.
patent: 4965719 (1990-10-01), Shoens et al.
patent: 5089952 (1992-02-01), Bozman
Index Locking and Splitting, IBM Technical Disclosure Bulletin vol. 25, No. 7B Dec. 1982, pp. 3725-3729, T. R. Malkemus.
Index Mini-Pages, IBM Technical Disclosure Bulletin, vol. 25, No. 11A, Apr. 1983, pp. 5460-5463, R. A. Crus; T. R. Malkemus; G. R. Putzolu.
Deadlock Detection and Avoidance for Shared Logical Resources, IEEE Trans. Software Eng. (USA), vol. SE-5, No. 5, pp. 465-471, Sep. 1979, D. J. Rypka, A. P. Lucido.
On the Modeling and Experimental Evaluation of a File System with Distributed Concurrency Control, Proc. 1985 Summer Computer Simulation Conference; SCS, San Diego, Calif., USA, xxxiv+758 pp. 299-304, 1985, A. Hac.
Taradalsky, Morris "Shared Locking Wihout a Lock", IBM Tech Disc Bulletin, vol. 18, No. 5, Oct. 1975 (copyright, 1975).
IBM Fortran Version 1.3 Reference Manual.
Colmark 7 & 8 of Duvall et al 4,742,450.
IBM Technical Disclosure Bulletin, vol. 16, No. 6, Nov. 1973, New York US, p. 1849, McKinstry `Sterilization of Dependent Processes`.
International Business Machines - Corporation
Kulik Paul V.
Lintz Paul
Rose Curtis G.
Roth Steven W.
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