--%>
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 : Program for Linux operating system that

    Write a program for Linux operating system that uses Posix threads to sort a large array.  Specifically, you should write a program to generate random numbers. Then create at least two threads, each of which sorts a portion of the array. After the thr

    		•
  • Q : What is an Iterator pattern Iterator

    Iterator pattern: It is a common pattern in which the contents of a collection are iterated above in order. The Iterator pattern frees a client of data from requiring details of how the data is stored. This pattern is maintained by the Iterator and Li

    		•
  • Q : What is Big-endian Big-endian : This is

    Big-endian: This is a common difference among machines, the order in which they store individual bytes of multi-byte numerical data. Big-endian machine stores the higher-order bytes previous to the lower-order bytes.

    		•
  • Q : Define the term Runtime error Define

    Define the term Runtime error: It is an error which causes a program to finish whenever it is being run.

    		•
  • Q : What is Discrete simulation Discrete

    Discrete simulation: In a discrete simulation, the time passes at an irregular rate which is determined by the primary events of interest in simulation.

    		•
  • Q : Explain Right shift operator Right

    Right shift operator: Right shift operator (>>) is the bit manipulation operator. It shifts the bits in its left operand zero (0) or many places to the right, according to the value of its accurate operand. The most important bit from before the

    		•
  • Q : What is an Immutable object Immutable

    Immutable object: It is an object whose state might not be modified. The objects of String class are immutable, for example - their length and contents are fixed once formed.

    		•
  • 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 the computer thread Explain the

    Explain the computer thread.

    		•
  • Q : Purpose of exec functions Specify the

    Specify the purpose of exec functions?

    		•