Dispatch control of virtual machine

Details Dispatch control of virtual machine Dispatch control of virtual machine

1989-06-14

1992-03-10

Shaw, Gareth D.

Boots, shoes, and leggings

3642281, 3642282, 3642303, 3642468, 3642628, 364DIG1, G06F 1516, G06F 1208

Patent

active

050954270

ABSTRACT:
A method and a system in a virtual machine system controlling a simultaneous run of one or more operating systems (OS's) by use of a virtual machine control program on a real machine including a storage area for each virtual processor constituting the virtual machine for saving a status of each virtual processor, for storing an active flag indicating whether or not the virtual processor is in the active state, and for storing a running priority specified for each virtual processor by the control program wherein when an OS being running issues an instruction to set the processor to the wait state, the instruction is directly executed, a state of the virtual processor being running is stored in the status save area, a processor is selected from processors for which the nonactive state is set, a virtual processor is selected according to the running priority from a group of virtual processors not in the wait state nor in the active state, and a content of the status save area of the virtual processor is set to the processor.

REFERENCES:
patent: 4189771 (1980-02-01), Roerer
patent: 4253145 (1981-02-01), Goldberg
patent: 4333144 (1982-06-01), Whiteside et al.
patent: 4400769 (1983-08-01), Kaneda et al.
patent: 4553202 (1985-11-01), Trufyn
patent: 4674038 (1987-06-01), Bretsford et al.
Computer Architecture and Parallel Processing, Briggs, F. A. & Hwang, K., 1984, p. 18.

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