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
Image manipulating system and method
Bipolar junction transistor with a self-aligned emitter and base
Communication apparatus, and method and program for controlling same
Liquid crystal display apparatus
Control device of hybrid vehicle
Monitoring heap in real-time by a mobile agent to assess performance of virtual machine
Controller for machine tool and five-axis simultaneous control machine tool controlled thereby
  Randomly Featured Patents
Multi port diverter valve
Method for processing shaft for hub unit and method for producing the shaft
Scan-type reducing projection exposure method and apparatus
Method of reducing static-charge on easter grass
Method and apparatus for determining one or more operating parameters for a microfluidic circuit
Mirror-based laser-processing system with temperature and position control of moving laser spot
Genetic sequences encoding substrate-specific dihydroflavonol 4-reductase and uses therefor
Protection system for a driver of a competition vehicle
Suppression circuit for interference pulses in transformers with high leakage inductance