Electrical computers and digital data processing systems: input/ – Interrupt processing
Reexamination Certificate
2005-03-29
2005-03-29
Auve, Glenn A. (Department: 2111)
Electrical computers and digital data processing systems: input/
Interrupt processing
C712S244000
Reexamination Certificate
active
06874049
ABSTRACT:
Disclosed is a multiprocessor system including a semaphore register and a semaphore interrupt register. In addition, for each processor in the multiprocessor system, there is a semaphore interrupt enable register. If a first processor finds that a semaphore cell of the semaphore register holds a “1” indicating that an associated shared resource is being accessed by a second processor, the first processor sets a corresponding semaphore interrupt enable cell of the semaphore interrupt enable register to “1” so as to enable semaphore interrupt. When the second processor finishes with the shared resource, the second processor writes a 0 into the semaphore cell, causing a corresponding semaphore interrupt cell of the semaphore interrupt register to hold a “1”. This, combined with the fact that the semaphore interrupt enable cell also holds a “1”, causes an interrupt to the first processor. In response, the first processor services the interrupt and accesses the shared resource. As a result, repetitive reading and writing the semaphore cell by the first processor via a system bus of the multiprocessor system can be avoided.
REFERENCES:
patent: 5534795 (1996-07-01), Wert et al.
patent: 5940856 (1999-08-01), Arimilli et al.
patent: 6018785 (2000-01-01), Wenniger
patent: 6108756 (2000-08-01), Miller et al.
patent: 20020073259 (2002-06-01), Grisenthwaite
patent: 20030018841 (2003-01-01), Lesartre
Auve Glenn A.
Cradle Technologies, Inc.
Protsik Mark
Schneck Thomas
Schneck & Schneck
LandOfFree
Semaphores with interrupt mechanism does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Semaphores with interrupt mechanism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Semaphores with interrupt mechanism will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3376358