Instruction execution modification mechanism for time slice cont

Details Instruction execution modification mechanism for time slice cont Instruction execution modification mechanism for time slice cont

1976-09-23

1978-08-22

Nusbaum, Mark E.

Boots, shoes, and leggings

179 15BA, G06F 919

Patent

active

041093119

ABSTRACT:
An instruction execution modification mechanism is described for a digital data processor wherein multiple programs or tasks are performed in a concurrent manner by means of a time slice mechanism which causes the instructions from the different programs to be executed in an interleaved manner. Instructions from the different programs are executed during different successive time slice intervals. The instruction execution modification mechanism is responsive to the occurrences of various predetermined conditions in the data processing system for selectively modifying the normal execution of different ones of the instructions in different ones of the programs. To this end, there is provided a program list mechanism listing the modifiable programs, an instruction list mechanism listing the modifiable instructions and a modification storage mechanism for storing modification signals for the different instructions. If, during a given time slice interval, the program to be executed is on the modifiable program list and the instruction to be executed is on the modifiable instruction list and the appropriate condition is occurring in the data processing system, then the modification storage mechanism is enabled to send the modification signals for this instruction to the instruction execution unit for modifying the normal execution of this instruction.

REFERENCES:
patent: 3470540 (1969-09-01), Levy
patent: 3573852 (1971-04-01), Wastson et al.
patent: 3718912 (1973-02-01), Hasbrouck et al.
patent: 3766524 (1973-10-01), Maring et al.
patent: 3781814 (1973-12-01), Deerfield
patent: 3868649 (1975-02-01), Sato et al.
patent: 3940741 (1976-02-01), Horikoshi etal.
patent: 3949380 (1976-04-01), Barbour et al.

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