Suspending and resuming processing of tasks running in a virtual

Details Suspending and resuming processing of tasks running in a virtual Suspending and resuming processing of tasks running in a virtual

1988-03-15

1990-03-27

Lee, Thomas C.

Boots, shoes, and leggings

3642282, 3642302, 3642612, 3642642, 364300, G06F 944

Patent

active

049126288

ABSTRACT:
A method for suspending and later resuming operation or processing of a program running in a virtual machine is described. The method involves creating and running a special program in the virtual machine which is to be accorded suspend and resume control functions. The suspend/resume control function program is run first before a user's task is run. The special suspend/resume program seizes control over the virtual machine's external interrupt controls and modifies them to direct all incoming interrupts to the program itself rather than allowing CMS of the virtual machine to handle interrupts as is normally done. With incoming interrupts being sent to the suspend/resume program for analysis and response, incoming commands that generate such interrupts may be responded to and sub-routines contained within the suspend/resume task program may be employed to save all of these addressing registers and general register contents. The suspend/resume task program operates to modify the interrupt controls of the virtual machine to create a suspension of operation of the user's task program by enabling the virtual machine only for external interrupts. The machine is later restored to operation and the user's task is resumed from its interrupted point by restoring all register contents, resetting the program status words and resetting the interrupt controls to enable full restoration of all operations.

REFERENCES:
patent: 4400769 (1983-08-01), Kaneda et al.
patent: 4631674 (1986-12-01), Blandy
patent: 4642756 (1987-02-01), Sherrod
patent: 4674038 (1987-06-01), Brelsford et al.
patent: 4695945 (1987-09-01), Irwin
patent: 4860190 (1989-08-01), Kaneda et al.

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