Single latch semaphore register device for multi-processor syste

Details Single latch semaphore register device for multi-processor syste Single latch semaphore register device for multi-processor syste

1997-07-22

1999-09-14

Auve, Glenn A.

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus access regulation

710245, G06F 1314

Patent

active

059516623

ABSTRACT:
In a multi-processor system, the semaphore device comprises a latch associated by software or hardware to a non-shareable resource. The output of the latch is connected to the bus for the re-reading of the semaphore by the processors. The output of the latch is also connected to an input of a multiplexer connected by its other input to the write bus of the semaphore. The control field output of the latch is connected to an AND gate receiving, at its other input, the control bit of the bus and conditioning, by its output, the writing of the latch. The task seeking to appropriate the semaphore tries to write its unique identifier in the latch with the control field at <<1>>. It then re-reads the semaphore register. Equality between the value re-read and the value written means that the task has succeeded in appropriating the resource. The source is released by the writing of the control field at <<0>>.

REFERENCES:
patent: 4380798 (1983-04-01), Shannon et al.
patent: 5159686 (1992-10-01), Chastain et al.
patent: 5276886 (1994-01-01), Dror
patent: 5317749 (1994-05-01), Dahlen
patent: 5339443 (1994-08-01), Lockwood
patent: 5428770 (1995-06-01), Garner
patent: 5526487 (1996-06-01), Schiffleger
patent: 5594880 (1997-01-01), Moyer et al.
patent: 5799195 (1998-08-01), Ross
patent: 5812876 (1998-09-01), Welker et al.

Affiliated with

Also associated with

Rating

Single latch semaphore register device for multi-processor syste does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Single latch semaphore register device for multi-processor syste, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Single latch semaphore register device for multi-processor syste will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1505758