Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Selenium/group 3A ink and methods of making and using same
Toilet bowl
Methods of fabricating semiconductor device
Transaction cost recovery queue management
Live-attenuated compositions for bacterial infections
Image forming apparatus
Generation of interpolated samples for decision based decoding
  Randomly Featured Patents
Portable communications device
Mixing basic service set (BSS) traffic and mesh forwarding traffic
Vacuum breaker valve
Method for parting rubber and products formed thereby, and a method of making a blood vessel
Corrosion-resistant high temperature pressure transducer employing a metal diaphragm
Electrophotographic apparatus
Mechanical resonance, silicon accelerometer
Uracil reductase inactivators
Sealing unit and a process for sealing parts
Preceramic compositions and ceramic products