Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Multi-processor resource locking mechanism with a lock register corresponding to each resource stored in common memory










Image Number 3 for United States Patent #5669002.

A method and apparatus to reduce bus usage and to increase resource locking protocol compatibility within a heterogeneous processing environment. Lock indicators are maintained in stores designated as lock registers and access to a resource is gained by any processor depending upon the status of a lock register associated with that resource. Access to a locked resource is barred to all but the locking processor, and only the processor which has set a lock can use or release that locked resource. A lock register controller controls the contents of the lock registers. A given processor P1-PN is identified by a unique ID vector G1-GN. These vectors are used to indicate both that a resource is locked and to indicate the identity of the locking processor. An unlocked resource is identified by a status vector (G.O slashed.). In a preferred embodiment, acquisition of exclusive access to an available resource is obtained with a simple read command; release of exclusive access is achieved with a simple write executed by the processor which has set the lock. By convention, processors will not access a resource requiring exclusive access until an inquiry of the associated lock register returns the G.O slashed. vector to the inquiring processor.








 
 
  Recently Added Patents
Method and system for detecting target objects
Active metal fuel cells
Laser protection polymeric materials
Device for identifying types of document files
Plants and seeds of hybrid corn variety CH817100
Error protection for pipeline resources
Antenna arrangement and antenna housing
  Randomly Featured Patents
Methods for modulating antibody production in treating patients with AIDS, ARC and other diseases
Tool bit
Valve stem holding device
Apparatus for cooling fuel and fuel delivery components
Bracteantha plant named `Flobraora`
Posterior burr hole localizer
Shelf-mounting assembly
Three-dimensional display apparatus
Exercise machine
Composition for forming piezoelectric, method for producing piezoelectric film, piezoelectric element and ink jet recording head