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Raymond’s Algorithm Assignment Help

Raymond’s Algorithm:

  • Forms the directed tree (logical) using the token-holder as root
  • Each node has variable “Holder” that points to its parent on the path to the root. Root’s Holder variable points to itself
  • Each node i has a FIFO request queue Qi

To request critical section:

  • Send REQUEST to parent on the tree, provided i does not hold the token presently as well as Qi is actually empty. After that place request in Qi

When the non-root node j receives a request from i

  • place request in Qj
  • send REQUEST to parent if no previous REQUEST sent

When the root receives the REQUEST:

  • send the token towards the requesting node
  • set Holder variable to point to indicate which node

When the node receives the token:

  • delete first entry in the queue
  • send token to that particular node
  • set Holder variable in order to indicate which node
  • if queue is non-empty, send a REQUEST message to the parent

To execute critical section:

  • enter if token is received and also own entry is at the top of the queue, delete the entry from the queue
  • To release critical section
  • if queue is non-empty, delete first entry from the queue, send token to that node and make Holder variable point to that node
  • If queue is still non-empty, send a REQUEST message to the parent
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