Resources Contact Us Home
Arbitrating multiprocessor accesses to shared resources

Image Number 6 for United States Patent #5339443.

In a multiprocessor computer system, an access request and an access grant register is provided for storing an access request and an access grant semaphore for each shared resource. The access request and grant semaphores having a number of access request and grant bits assigned to the processors. Additionally, circuits are provided for each access request register for setting/clearing individual access request bits, and simultaneous reading of all access request bits of the stored access request semaphore. Furthermore, coordinated request and grant masks that reflect the relative access priorities of the processors are provided for the processors to use in conjunction with the current settings of the access request and grant semaphores to determine whether a shared resource is granted to a lower priority processor and whether a shared resource is being requested by a higher priority processor. As a result, multiprocessor accesses to shared resources are arbitrated in a manner having a number of advantages over the prior art.

  Recently Added Patents
Metal-doped oxide, method of preparing the same, and solid oxide electrolyte using the metal-doped oxide
Apparatus for restoring setting information of a board management controller from a backup memory before loading an OS when a system board is replaced
Cancer vaccines containing epitopes of oncofetal antigen
Methods and apparatus for performing multiple photoresist layer development and etching processes
Scanning projection apparatus with tangential compensation
System and transceiver clocking to minimize required number of reference sources in multi-function cellular applications including GPS
  Randomly Featured Patents
Regulating unused/inactive resources in programmable logic devices for static power reduction
Full enclosure chassis system with tool-free access to hot-pluggable circuit boards therein
Azithromycin for the treatment of nodular acne
Semiconductor device and a method of manufacturing the same
Macrocyclic hetero imine complexing agents
Melanocortin metallopeptide constructs, combinatorial libraries and applications
Locked security cover for a smoke alarm
Adjustable liquid sampling apparatus
Wet-process phosphoric acid brightening reagent for aluminum
Insulating bobbin for stator of rotary machine