Method of transferring control in a multitasking computer system
US4974159A · kind A · utility
60Cited by
1References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1988 |
| Grant date | Nov 27, 1990 |
| Priority date | — |
| Expiry date | Sep 13, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/4843
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An improved method and system for transferring control in a multitasking computer system is provided. In preferred embodiments for use with 80386 machines, the virtual machine monitor (VMM) writes a virtual machine break point (VMBP) instruction into the executable code of selected DOS routines to cause the DOS routines to transfer control to the VMM. By selecting systems calls of indefinite duration for the application of this method, system performance can be improved. In this preferred embodiment for 80386 machines, 8086 programs designed to run under DOS can be more efficiently executed in a multitasking environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.