Operating system for use with protection domains in a single address space
US6542919B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1996 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Mar 22, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/1491
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An operating system that provides protection domain support is arranged so to be compatible with “well behaved” threads, i.e., threads that obtain all their memory allocations from the operating system, that were written without regard for protection domains. This may be achieved by associating each protection domain with one or more pages of memory, so-called “primary memory pages”, for which the protection domain has read and write access permission. Requests by such a “protection-domain-unaware” thread to the operating system for a memory allocation, e.g., for memory in which to create a data structure, are automatically fulfilled by the operating system from the memory available in the primary memory pages of the protection domain of the requesting thread. The operating system informs the thread of the location of the created data structure, e.g., by passing to the thread a pointer to the data structure. Note that threads may have read and/or write access to memory pages that are not primary pages for their protection domains. Thus, the operating system controls 1) the access permission for each page; 2) the allocation for use as primary page…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.