Real-time computer system with multitasking supervisor for build

Details Real-time computer system with multitasking supervisor for build Real-time computer system with multitasking supervisor for build

1990-05-25

1993-05-11

Shaw, Gareth D.

Boots, shoes, and leggings

364DIG1, 3642814, 3642817, G06F 938, G06F 946

Patent

active

052108732

ABSTRACT:
A method is disclosed for providing a single-tasking disk operating system with multitasking capability in a real-time computer system for building access control or the like. A number of reentrant, terminate-and-stay-resident application programs are loaded into a host microcomputer. As each application program loads, it passes its unique code segment and instruction pointer parameters to a look up table. For the last application program to be loaded, the program segment prefix of the application program residing in the disk operating system is copied and stored. When a timer interrupt prompts the program switching logic, the code segment and instruction pointer parameters of the then-executing program are compared with the values in the look-up table. If no match is found, program switching is postponed. If a match occurs indicating one of the application programs is then executing, a switch is permitted if the current program segment prefix matches the stored copy, thus providing fast switching when permissible.

REFERENCES:
patent: 3857018 (1974-12-01), Stark et al.
patent: 4545016 (1985-10-01), Berger
patent: 4636947 (1987-01-01), Ward
patent: 4689610 (1987-08-01), Dietrich
patent: 4788647 (1988-11-01), McManus et al.
patent: 4847751 (1989-07-01), Nakade et al.

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