Storage locking control for a plurality of processors which shar

Details Storage locking control for a plurality of processors which shar Storage locking control for a plurality of processors which shar

1988-04-27

1991-01-08

Fleming, Michael R.

Boots, shoes, and leggings

3642281, 3642466, 3642468, G06F 1300

Patent

active

049841530

ABSTRACT:
In a plural processor data processing system, a lock is obtained on a commonly shared storage means that allows for the testing of a control word associated with a selected memory address of a particular data processor wherein each of the data processors of the system is capable of independently requesting a lock on said control word. Lock requests are broadcast to each of the data processors. The lock is then established according to predefined criteria by transmission of the lock requests of all of said processor means at the same time at controlled intervals, and by providing the lock on the control word when the requesting processor is the only processor that is requesting a given control word during a control interval, or when the processor transmits its lock request simultaneously with other processor means of a lower priority.

REFERENCES:
patent: 3735360 (1973-05-01), Anderson et al.
patent: 4070706 (1978-01-01), Scheuneman
patent: 4099243 (1978-07-01), Palumbo
patent: 4214304 (1980-07-01), Shimizu et al.
patent: 4574350 (1986-03-01), Starr
patent: 4733352 (1988-03-01), Nakamura et al.
Patent Abstracts of Japan, vol. 6, No. 100 (P-121)(978), Jun. 9, 1982, & JP, A 5733471 (Fujitsu K.K.) Feb. 23, 1982.
IBM Technical Disclosure Bulletin, vol. 25, No. 10, Mar. 1983, (New York, U.S.), D. Gawlick: "Lock Processing in a Shared Data Base Environment", pp. 4980-4985.

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