Patent
1995-05-22
1998-02-24
Chan, Eddie P.
395490, 395472, G06F 1214
Patent
active
057218706
ABSTRACT:
A lock control for a data processing system providing lock control for each data processing unit in the data processing system. The lock control is carried out based on a state of a lock variable, by a lock request control unit of a cache unit connected to the dam processing unit. On receipt of a lock request or unlock request, the lock request control unit indexes a lock address register holding an address of the lock variable and refers to a state of a lock stored in a corresponding lock status register. Various kinds of states are defined as a state of a lock variable to indicate that each lock request control unit is in a lock or unlock state. A symbol ULE indicates the state that no acquisition of a lock in all lock request control units is confirmed. Thus, an acquisition of a lock corresponding to a particular lock request control unit can be done with high speed, without confirming states of lock request control units other than the particular lock request control unit.
REFERENCES:
patent: 4733352 (1988-03-01), Nakamura et al.
patent: 4928225 (1990-05-01), McCarthy et al.
patent: 4984153 (1991-01-01), Kregness et al.
patent: 5289588 (1994-02-01), Song et al.
patent: 5297269 (1994-03-01), Donaldson et al.
Bragdon Reginald G.
Chan Eddie P.
NEC Corporation
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