Method of transferring control in a multitasking computer system
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United States of America Patent
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Nov 27, 1990
Grant Date -
N/A
app pub date -
Sep 13, 1988
filing date -
Sep 13, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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