User Account

All Pages

Concurrent Programming, JAVA Programming

Assignment Help:
Problem 1
A savings account object holds a non-negative balance, and provides deposit(k )
and withdraw(k ) methods, where deposit(k ) adds k to the balance, and
withdraw(k ) subtracts k, if the balance is at least k, and otherwise blocks until
the balance becomes k or greater. getbalance() gives the current balance.
1. Implement this savings account using locks and conditions (use
java.util.concurrent.locks.ReentrantLock). Test by using the 3
functions.
2. Now suppose there are two kinds of withdrawals: ordinary and preferred.
Devise an implementation that ensures that no ordinary withdrawal occurs
if there is a preferred withdrawal waiting to occur.
Problem 2
Consider the following conditions: An enqueuer waiting on a full-queue or
a dequeuer waiting on an empty queue sleep indefinitely, unless woken up by
another thread. A thread must send a signal ONLY when it adds an element
to an empty queue or removes an element from a full-queue.
1. Implement a bounded partial queue using a signaling mechanism that
signals to all waiting dequeuers.
2. Implement the bounded partial queue by using a signaling mechanism
(your own scheme) that signals to only one waiting dequeuer or enqueuer,
and ensure that the lost-wake-up problem does not happen.
1
Problem 3
We have n threads, each of which executes method foo() followed by bar().
We want to add synchronization to ensure that no thread starts executing bar()
until all threads have finished executing foo(). To achieve this, we will insert
some barrier code between the two methods. Implement the following two
schemes for barrier code:
• Use a shared counter protected by test-and-test-and-set lock. Each thread
locks the counter, increments it, releases the lock, and repeatedly reads
the counter until it reaches n.
• Use an n-element Boolean array A. Initially all entries are 0. When thread
0 executes its barrier, it sets b[0] to 1, and repeatedly reads b[n - 1]
until it becomes 1. Every other thread i, repeatedly reads b[i - 1] until
it becomes 1, then it sets b[i] to 1, and repeatedly reads b[n - 1] until
it becomes 1.
Implement both these schemes in Java. Each of the methods foo() and
bar() just sleeps for 20 milliseconds. Test the two schemes for n = 16. Run
each scheme at least ten times, measure the total runtime in each test run,
discard the highest and lowest values, take the average, and use it to compare
the two schemes. Which performs better? Can you explain the reason? You
can run the experiments on ecen5033.colorado.edu. Submit the code as well as
experimental results.

Related Discussions:- Concurrent Programming

Use of weblogic platform in project, Use of WebLogic Platform in Project: ...

Use of WebLogic Platform in Project: Technologies Tools: Weblogic 8.1, Solaris 9, MQ Series 6.0, iplanet 6.1, Mercury Test Director. Project Overview: Wellington Manag

Taking in command line arguments, Taking in Command Line Arguments In J...

Taking in Command Line Arguments In Java, the program can be written to accept command-line-arguments. Example Code:  command-line arguments /*  This

Arrays, examples of 2D arrays

examples of 2D arrays

How to use dispatchaction, To use the DispatchAction, follow these steps: ...

To use the DispatchAction, follow these steps: ? Make a class that extends DispatchAction (instead of Action) ? In a new class, add a method for each function you need to per

What are the principle concepts of oops, What are the principle concepts of...

What are the principle concepts of OOPS? Principle concepts upon that object oriented programming and design rest. They are: Abstraction: Abstraction refers to the act of

Write a program on clearing rectangles, Write a program on clearing Rectang...

Write a program on clearing Rectangles ? It is also potential to clear a rectangle that you've drawn. The syntax is exactly what you'd expect: public abstract void clearRect

Prepare simple spring maven task, Prepare Simple spring maven task Proje...

Prepare Simple spring maven task Project Description: We want a very simple delivery for one of our tasks using Spring STS Maven project. This chat does not have UI interf

Explain abstract method in java, Explain abstract method in java? Java ...

Explain abstract method in java? Java permits methods and classes to be declared abstract. An abstract method is not actually implemented in the class. It is merely declared th

Inheritance, Draw an inheritance hierarchy to represent a shoe object. The...

Draw an inheritance hierarchy to represent a shoe object. The base class should have derived classes of Dress Shoes, Tennis Shoes and Boots.

Method over ridding method in java, Q. Write short on the method over riddi...

Q. Write short on the method over ridding method in java? Ans. Method over ridding and dynamic binding: We have seen that a method in a super class is inherited by its subclass

Write Your Message!

Captcha
Order Assignment

Featured Services

Order Now

Popular Subjects

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +91-977-207-8620

Phone: +91-977-207-8620

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd