--%>
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 : What is Disk drive Disk drive : It is a

    Disk drive: It is a hardware device employed to store the data. They come in numerous forms, like floppy disks, compact disks, and hard disks.

    		•
  • Q : Explain Message passing Message passing

    Message passing: We characterize the object interactions as message passing. The client object sends a message to a server object by invoking a technique from the server's class. Arguments might be passed with the message, and a outcome is returned by

    		•
  • Q : Define Number of Threads Number of

    Number of Threads: Threads can be a useful abstraction and implementation mechanism to partition independent program actions. However, when there is coordination (or interference) between these threads, the required synchronization mechanisms increase

    		•
  • Q : Different file types Specify the

    Specify the different file types?

    		•
  • Q : Explain Return type Return type : It is

    Return type: It is the declared type of a method, appearing instantly before the method name, like void in     public static void main(String[] args)    or Point[] in 

    		•
  • Q : Technologies are used in AJAX Name the

    Name the technologies that are used in AJAX?

    		•
  • Q : Chown Explain the chown, chmod and

    Explain the chown, chmod and chgrp?

    		•
  • Q : Explain Model-view pattern Model-view

    Model-view pattern: It is a pattern in which the representation of data (that is, the model) is kept separate from its visualization (that is, the view). These decoupling makes it simpler to change the underlying data representation, or give multiple

    		•
  • Q : What is an Argument Argument : It is

    Argument: It is the information passed to a method. Arguments are as well sometimes termed as parameters. The method expecting to receive arguments should contain a formal argument declaration for each as portion of its method header. Whenever a metho

    		•
  • Q : Double clock signal in synchronous

    Describes the cases where you need to double clock a signal before presenting this to a synchronous state machine?

    		•