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
Methods for measuring media performance associated with adjacent track interference
Soybean cultivar CL1013663
Semiconductor device and manufacturing method thereof
Radio link monitoring (RLM) and reference signal received power (RSRP) measurement for heterogeneous networks
Multi-dimensional credibility scoring
Wristband with detachable labels
Fabricated leaf tea products
  Randomly Featured Patents
Method and apparatus for accelerating the transfer of graphical images
Method and tool for determination of fracture geometry in subterranean formations based on in-situ neutron activation analysis
Method for systematically assessing the quality of medical appliances that are in operation
KLK-13 antibody inhibitor for treating dry eye
Multi-chip semiconductor connector assembly method
Method for heating agglomerating slurries
Method of removing headspace volatiles and analysis thereof
Method of making MnZn ferrites
Sculpturing resin composition and process for sculpturing a sculptured product
Apparatus for mixing kettle contents