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 and apparatus for user selection of advertising combinations
Deadline-driven parallel execution of queries
Synthesized interoperable communications
Integrated touch screen
Control device for radiation imaging apparatus and control method therefor
Method for manufacturing a substrate for a display device
Server providing pseudo print preview and final regular preview to device
  Randomly Featured Patents
Spinal traction device
Semiconductor device
Payment based electronic mail printing system utilizing search criteria
Print job spooling and distribution system
Device for interstitial transvascular intervention and revascularization
Image processing apparatus with programmable selection of abnormal condition handling
Photo album with provision for media playback
Filtration cell for tangential flow filtration and filtration system making use of such cell
Combination sleeping bag and hammock