Resources Contact Us Home
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
Instrumenting configuration and system settings
Compositions and methods for producing isoprene
Asynchronous task execution
Hand mixer
Immunotherapy in cancer treatment
Controller with screen
Rules-based approach to transferring and/or viewing medical images
  Randomly Featured Patents
Method for preparing 2,5-dipcryl-1,3,4-oxadiazole
Electric organ tone generating system
Techniques for robust color transfer
Variable focal length deformable mirror
Mineral fiber-based absorbent material
Process for producing a fiber-reinforced, hydraulically setting composition, the composition produced and the use thereof
Chair seat adjustment assembly
Signal selective circuit
Repair method for a blade of a turbomachine
Uniform reflectance optical mirror