Loosely coupled compound computer system using lock and semaphor

Details Loosely coupled compound computer system using lock and semaphor Loosely coupled compound computer system using lock and semaphor

1995-06-02

1997-01-07

Lee, Thomas C.

Boots, shoes, and leggings

395728, 395729, 39520014, 3642281, 3642288, 3642568, G06F 1300

Patent

active

055926738

ABSTRACT:
Exclusive control using a semaphore mechanism of a specific computer is executed, and P and V operation instructions for the semaphore mechanism are issued according to a use request and use end information of a shared resource from another computer or the specific computer. Whether or not enabling information for the use request is informed to a use request source computer is determined according to the value of a semaphore variable. For this reason, even when a use of the shared resource is not enabled, enabling information is merely not sent back to another computer or the specific computer as the request source computer, and a lock server mechanism can be prevented from being set in an execution waiting state according to the unsuccessful P operation instruction.

REFERENCES:
patent: 4189771 (1980-02-01), Roever
patent: 4320451 (1982-03-01), Bachman et al.
patent: 4574350 (1986-03-01), Starr
patent: 5016162 (1991-03-01), Epstein et al.
patent: 5050072 (1991-09-01), Earnshaw et al.
patent: 5170481 (1992-12-01), Begun et al.

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