Boots – shoes – and leggings
Patent
1990-02-28
1994-04-12
Shaw, Gareth D.
Boots, shoes, and leggings
395600, 364DIG1, 3642815, 3642821, 3642468, G06F 1200
Patent
active
053033680
ABSTRACT:
In a dead lock preventing method for a data base system, for preventing a dead lock from being generated when a plurality of work stations, each having a data base, connected to a transmission route, perform lock reservation requests and lock requests to access a data base file of a desired arbitrary work station, a data base system including arithmetic control unit, an internal memory unit (first memory unit) having a file lock reservation list, a file lock transaction list, and a file lock transaction waiting list, and an external memory unit (second memory unit) for forming a data base constituted by a plurality of files is prepared for each work station. This dead lock preventing method includes a list judgement step of giving, when the arithmetic control unit accepts the lock request after a certain work station outputs a lock reservation request from a certain transaction, a lock permission or a lock inhibition to the certain transaction in accordance with whether another transaction is registered in the file lock transaction list and the file lock reservation list, and an aggregation judgement step of obtaining, when it is judged in the list judgement step that another transaction is registered not in the lock transaction list but in the file lock reservation list, transaction aggregations from the file clock reservation list and the file lock transaction list, and sequentially checking whether the transaction aggregation of the file lock transaction list is a zero aggregation, thereby giving a lock permission or a lock inhibition to the certain transaction.
REFERENCES:
patent: 4494193 (1985-01-01), Brahm et al.
patent: 4791554 (1988-12-01), Hirota et al.
patent: 4881166 (1989-11-01), Thompson et al.
patent: 5016167 (1991-05-01), Nguyen et al.
patent: 5095421 (1992-03-01), Freund
Chaki Kakali
Kabushiki Kaisha Toshiba
Shaw Gareth D.
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