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
Resin composition and molded article
Systems and methods for computer-aided fold detection
Probe card holding apparatus with probe card engagement structure
Nozzle
Wild card auto completion
Semiconductor device and method of manufacturing the same
Data unit receiver and sender control method
  Randomly Featured Patents
Methods of and apparatus for making an insulated transmission medium
Methods and apparatus for replacing cooling systems in operating computers
Energy storage system utilizing compressed gas
Captive nut
Tabletop advertising display
Wet strength enhancers for paper
Thermally stable aminosulfur trifluorides
Light tube
Vehicular brake hydraulic control device
Similarity searching in large disk-based networks