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A polynomial local solution to Mutual Exclusion

A polynomial local solution to Mutual Exclusion. Doorways. Doorway is a separation mechanism of two areas. Processes which pass a doorway at time T prevent neighbour processes entering the same area at a greater time than T until exiting the doorway. Asynchronous Dorway. Enry Code.

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A polynomial local solution to Mutual Exclusion

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  1. A polynomial local solution to Mutual Exclusion

  2. Doorways • Doorway is a separation mechanism of two areas. • Processes which pass a doorway at time T prevent neighbour processes entering the same area at a greater time than T until exiting the doorway.

  3. AsynchronousDorway EnryCode ExitCode m1 is the I am going in message

  4. Behaviour

  5. Problem with the AsynchronousDoorway

  6. Synchronous Doorway • A process which desires to enter a synchronous doorway is required to wait for a situation in which all its neighbours are outside the doorway. This is implemented by checking for a process the states of its neighbours before it enters the doorway.

  7. Entrycode: Exitcode:

  8. What Can Go Wrong?

  9. WhatifWeCombine?

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