Data processing system with lock-unlock instruction facility
US4488217A · kind A · utility
44Cited by
11References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 19, 1981 |
| Grant date | Dec 11, 1984 |
| Priority date | — |
| Expiry date | May 19, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/374
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data processing system including a plurality of data units and a common bus. The data unit includes apparatus for issuing instructions including a LOCK instruction and an UNLOCK instruction. Each data unit includes apparatus responsive to the instructions such that, if the first data unit issues a LOCK instruction, the data unit other than the first data unit, are prevented from transferring information over the common bus with a LOCK instruction until an UNLOCK instruction is issued by any data unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.