--%>
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 Livelock Livelock : It is a

    Livelock: It is a situation in which a thread waits to be notified of a condition however, on waking, finds that the other thread has inverted the condition another time. The primary thread is forced to wait again. Whenever this occurs for an indefini

    		•
  • Q : Passing by address or reference Passing

    Passing by address or reference: In this technique no separate memory build for formal variables that is, formal variables share similar location of actual variables and therefore any change on formal variables automatically reflected back to real var

    		•
  • Q : Explain the differences among SEI

    What in your advice are the most important fundamental differences among SEI SW-CMM and ISO 9000-3?

    		•
  • Q : How XML web services integrate two

    How can XML web services integrate two legacy distributed systems, one based on Corba and one based on Java RMI?

    		•
  • Q : What is an Instance variable Instance

    Instance variable: It is a non-static field of a class. Each and every individual object of a class has its own copy of this field. This is in contrary to a class variable that is shared by all instances of class. Instance variables are employed to mo

    		•
  • Q : Define Object serialization Object

    Object serialization: The writing of an object's contents in such a manner that its state can be restored, either at a later time, or in a different procedure. This can be employed to store objects between runs of a program, or to transfer or shifts o

    		•
  • Q : Describe the Binders Briefly describe

    Briefly describe the Binders?

    		•
  • Q : What do you mean by program counter

    What do you mean by the term program counter? Write down its use?

    		•
  • Q : Explain Singleton pattern Singleton

    Singleton pattern: It is a pattern which permits us to make sure that only a single instance of a specific class exists at any one time. Such an instance is termed as singleton. The pattern can as well be employed whenever instances would have no excl

    		•
  • Q : Image reconstruction in CT using MATLAB

    What is Image reconstruction in CT using MATLAB?

    		•