System for monitoring and undoing execution of instructions beyond a serialization point upon occurrence of in-correct results
US5257354A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1991 |
| Grant date | Oct 26, 1993 |
| Priority date | — |
| Expiry date | Jan 16, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/3861
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system whereby a central processor continues operation beyond a serialization point before the architecture defines that it is permissible to do so. According to the system, it is ascertained whether correct results are being achieved after the serializing point. If some doubt develops about the correctness of the results, the processor is returned to its status at the serialization point and the processing is repeated. In one embodiment, correctness of results is determined by way of a monitoring mechanism which depends on the fact that interactions between CPUs are confined to references to storage. The operations which are performed prior to the time that the architecture allows them, are restricted to ones which depend on fetches made from storage. The needed assurance of correct operation is gained by monitoring the storage locations from which fetches are made on behalf of instructions which logically follow the serializing operation, but which are made prior to the time that fetching is allowed to resume. If those storage locations are not changed during the time between when the first such fetch is actually made from one of them, and the time that fetching is allowed to r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.