--%>
Assignment Help - homework help

Networking, Distributed and Concurrent Programming

Homework Assignment : A Barbershop Problem Due: November 20, 2012 In this assignment, you are asked to write a multithreading problem to simulate the barbershop problem, which is a classical synchronization problem. The problem is taken from William Stallings's Operating Systems: Internals and Design Principles, 3rd Edition, 1998. Barber problem: Orchestrating activities in a barbershop 1. 3 chairs, 3 barbers, 1 cash register, waiting area includes 4 customers on a sofa, plus additional standing room for 7 customers. 2. A customer : • Will not enter the shop if it is filled to capacity • Takes a seat on the sofa, or stands if sofa is filled • When a barber is free, the customer waiting longest on sofa is served, the customer standing longest takes up seat on the sofa • When a customer's haircut is finished, any barber can accepted payment but because of the single cash register, only one payment is accepted at a time • Barbers divide their time between cutting hair, accepting payment and sleeping Assume the arrival rate of customers is 1 customer/3 minutes, the haircut speed of three barbers are the same 5 minutes. Initially, all three barbers are sleeping, and there is no guest in the barbershop. The output of your program is the snapshot of the barbershop at a given time (an input parameter of the program), including how many customers in the barbershop, how many are seated, how many are on the barber chairs, current status of three barbers, current status of cashier, and how many customers are dropped. Hints: • You can start from the code included in the slides, and try to solve the remaining problems (slides) step by step. • The interval of your simulation step should not larger than 1 minute. Extra credits: You can get 0.5 extra credit if you can handle the poisson arrival of customers. You can get 0.5 extra if you can handle varied hair cutting speed.

   Related Questions in Programming Languages

  • Q : Define the synchronization objects

    Define the synchronization objects. Ansewr: A synchronization object is use to co-ordinate the execution of many threads.

    		•
  • Q : Situations where AJAX must not be used

    Explain the situations in which the AJAX must not be used.

    		•
  • Q : Illustrates database connection pooling

    Illustrates database connection pooling which is relative to MTS. Answer: This permits MTS to reuse database connections. Pooling of database connections are put to

    		•
  • Q : Explain Sign extension Sign extension :

    Sign extension: Whenever an integer value from a type with a specific range is stored in a variable with a larger range, Java employs sign extension to determine the resultant value. The most important bit in the original value is employed to fill the

    		•
  • Q : Explain Primitive Type Abstractions

    Primitive Type Abstractions: An effective way to reduce the state space of a program is to replace the primitive types with the corresponding abstractions that encapsulate all the possible operations that are performed on these types.

    Q : Explain Constructor Constructor : A

    Constructor: A constructor is automatically called whenever an instance of its class is formed. A constructor always has similar name as its class, and encompass no return type. For example: public

    		•
  • Q : Write a function Write a function that

    Write a function that takes an integer value and returns the number with its digits reversed. For example, given 7631, the function should return 1367.

  • Q : What is Hostname What is Hostname : It

    What is Hostname: It is the name of a host system.

    		•
  • Q : Learning File system with operations

    Program 1. Purpose of this assignment is to learn to work with files.Assignment: The file, data.txt, is provided on the class website. Each line of the file consists of a binary operator followed by two operands. Your program wi

    		•
  • Q : Walk through the steps essential to

    How can you walk through the steps essential to parse XML documents?

    		•