Boots – shoes – and leggings
Patent
1985-09-30
1989-02-28
Heckler, Thomas M.
Boots, shoes, and leggings
G06F 900, G06F 946
Patent
active
048091570
ABSTRACT:
A method for dynamically assigning and removing task affinity for a resource is disclosed and claimed. A first interrupt handler recognizes a special task interrupt condition which is generated by the hardware. The interrupt condition is generated because a task attempted to execute a special instruction and either a special resource is attached to the central processing unit which issued the special instruction, or a special resource is not attached to the issuing central processing unit, but could be attached to another central processing unit in a central electronic complex. The first interrupt handler then passes control to a second interrupt handler which determines if execution of the current task can continue. If it can, the second interrupt handler creates or reestablishes a special environment and the task is dispatched (either for the first time or again) with a special dynamic affinity to only those central processing units in the central electronic complex that have a special resource attached. Due to the assignment of special affinity the task is dispatched only on a central processing unit with a special resource attached. The task can be suspended and special affinity removed because of non-use of the special resource over a predetermined period of time. Special affinity is automatically determined following a first-issued special instruction as well as one issued by a task whose special affinity was previously suspended.
REFERENCES:
patent: 4400769 (1983-08-01), Kaneda et al.
patent: 4590555 (1986-05-01), Bourrez
patent: 4642756 (1987-02-01), Sherrod
IBM OS/VS2 MVS Overview, entitled "Dynamic Assignment of Affinity for Vector Tasks", by Eilert et al., May, 1980.
IBM TDB, vol. 16, No. 2, Jul., 1973-pp. 654-657, (p. 655, section I).
Proceedings of 5th International Conference on Distribute Computing Sys, May, 1985, pp. 310-320, (p. 315).
IBM Systems Journal, No. 1, 1974, pp. 60-87, (p. 73, 1.13-p. 74, 1.18).
Eilert John H.
Frey Jeffrey A.
Tan Yih-Shin
Warnes James H.
Biela J. A.
Heckler Thomas M.
International Business Machines Corp.
Kulik Paul
Porter W. B.
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