--%>
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 : Explain This This : It is a Java

    This: It is a Java reserved word with numerous different uses: A) Within a constructor, it might be employed as the first statement to call the other constructor in similar class. For illustration:

    Q : Monte Carol method to estimate pi An

    An interesting way to estimate pi can can done using Monte Carol method with minimal mathematics. Monte Carlo is known for its casinos. A Monte Carlo method uses change, or in our case, random numbers to simulate the real situation. The situation we simulate here is t

    		•
  • Q : What is First in-first out First in,

    First in, first out: It is FIFO semantics of the queue data structure. Items are eliminated in the order in which they arrived in the queue; therefore older items are always eliminated before newer ones.

    		•
  • Q : Define undershoot You have a driver as

    You have a driver as drives a long signal and connect to an input device. On the input device there is either undershoot, overshoots or signal threshold violations, so what can be done to correct such problem?

    		•
  • Q : Define the term Address space Define

    Define the term Address space: The region of virtual memory in which a procedure is run.

    		•
  • Q : Implementation of XML Web Services

    Explain the implementation of XML Web Services to be found in .NET. In particular, explain the role of the wsdl.exe tool.

    		•
  • Q : What does XSLT processing models include

    What does extensible style sheet language transformations processing models involve?

    		•
  • Q : What is Class header Class header : It

    Class header: It is a header of class definition. The header provides a name to the class and states its access. It too explains whether the class expands a super class or implements any interfaces.

    		•
  • Q : Explain the term XForms Explain the

    Explain the term XForms.

    		•
  • Q : Define Java virtual machine or JVM

    Define Java virtual machine (JVM): A Java Virtual Machine (JVM) is an abstract computing machine, or virtual machine (set of computer software programs and data structures) which is a platform-independent execution environment that converts Java bytec

    		•