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
Method for providing interactive site map
Poloxamer foamable pharmaceutical compositions with active agents and/or therapeutic cells and uses
Method and system for distributing load by redirecting traffic
Cooking oven with energy saving mode and method
Pet fish burial pod
System for non-destructive image processing
  Randomly Featured Patents
Aspirated enhanced total air temperature probe
Method of fabricating ink-jet type printer head
Ultraviolet water treatment apparatus
Forearm and wrist protector
Elevator system
RPM Governor for fuel injection engines
Circuit for controlling the switching of a load by means of an emitter-switching device
Fusion partner for production of monoclonal rabbit antibodies
Dual-fresnel field lens for a single-panel LCD projection system
Rotary device