Task management apparatus

Details Task management apparatus Task management apparatus

1976-04-30

1977-09-06

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 919, G06F 920

Patent

active

040471616

ABSTRACT:
A data processing system is described which has multiple sets of registers each of which is capable of autonomously controlling a common storage and common arithmetic and logic control circuits to execute respective tasks of a program. Level status blocks (LSBs), each assigned to a respective task, are held in main storage; and each contains such address and status data as is required for task execution in a controlled environment. Apparatus, including a current level register, a selected level register, a pending level register and an in-process bit latch, is controlled during the execution of a load level status block (LLSB) instruction to transfer the LSB of a selected task from storage to the selected register set, determine the status of the in-process bit of the selected task LSB and the relative priority levels of the current and selected tasks, and pursuant to said two determinations handle the task dispatching, preemption, enqueuing, dequeuing functions without the need for further software processing. At the completion of the LLSB instruction execution, either the current task execution is continued, the selected task is initiated, a pending task is initiated or a system wait state is entered. A store level status block (STLSB) instruction is executed to copy the LSB of a selected task from the register set to storage. Hardware backup registers are provided to hold certain updated status of the current register set to improve performance. These backup registers are changed during the LLSB execution if task switching occurs and are restored to the current register set during STLSB execution.

REFERENCES:
patent: 3496551 (1970-02-01), Driscoll et al.
patent: 3530438 (1970-09-01), Mellen et al.
patent: 3566357 (1971-02-01), Ling
patent: 3568157 (1971-03-01), Downing et al.
patent: 3643227 (1972-02-01), Smith et al.
patent: 3648252 (1972-03-01), Thron et al.
patent: 3648253 (1972-03-01), Mullery et al.
patent: 3665415 (1972-05-01), Beard et al.
patent: 3665421 (1972-05-01), Rehhausser et al.
patent: 3825902 (1974-07-01), Brown et al.
patent: 3905025 (1975-09-01), Davis et al.
patent: 3916383 (1975-10-01), Malcolm
patent: 3916385 (1975-10-01), Parmar et al.
patent: 3940745 (1976-02-01), Sajeva

Affiliated with

Also associated with

Rating

Task management apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Task management apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Task management apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2165836