--%>
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 Preempt Preempt: It is the

    Preempt: It is the presently executing thread might be preempted, or forced to give up control, by a higher priority thread which becomes eligible to run throughout its time slice.

    		•
  • Q : What is Primitive Type Casting

    Primitive Type Casting: C/C++ allows you to cast between totally unrelated types. This can be problematic for model checking. Avoid type casting between unrelated types and in particular primitive types. For example,

    Q : Explain Twos-complement notation

    Twos-complement notation: In twos-complement notation, the most noteworthy bit in an integer value is employed as the sign bit. A 1 bit points out a negative number, and a 0 bit points out a positive number. The positive number can be transformed to i

    		•
  • Q : What is Filter stream Filter stream :

    Filter stream: It is an input-output class which filters or manipulates its stream of input- or output-data in some manner. Two illustrations are: DataInputStream and DataOutputStream.

    		•
  • Q : Define the term Micro- Processor Define

    Define the term Micro- Processor.

    		•
  • Q : Explain different types of variable iv

    The kind of value that a variable can own is known as data type. When we state a variable we require specifying the type of value it will own with the n

    		•
  • Q : Define Continue statement Continue

    Continue statement: A statement which might only be employed within the body of a loop. In case of a while loop or do loop, control passes instantly to the loop's terminating test. In case of a for loop, the control passes to the post-body update expr

    		•
  • Q : Model Java Interface applications What

    What wide range of applications are provided by Model Java Interface?

    		•
  • Q : What is an Infinite recursion Infinite

    Infinite recursion: Recursion which does not finish. This can effect from any of direct recursion, indirect recursion or the mutual recursion. It is generally the outcome of a logical error, and can consequence in stack overflow.

    		•
  • Q : Explain Static variable Static variable

    Static variable: It is a static variable defined within a class body. Such a variable fits in to the class as a whole, and is, thus, shared by all objects of the class. The class variable may be employed to define the default value of an instance vari

    		•