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.


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

Differentiation between a vector and an array, Differentiation between a V...

Differentiation between a Vector and an array . Explain in Brief about the pros and cons of both?

What is the use of textmessage, TextMessage having instance of java.lang.St...

TextMessage having instance of java.lang.String as its payload. Therefore it is very useful for exchanging textual data. It can also be used for exchanging difficult character data

Naive bayes classifier to compute the class of handling, 1) Categorical var...

1) Categorical variable tread Pattern = {A, B} and numerical variable tread Depth are used to classify Handling = {good, poor} of a vehicle. Depth is normally distributed with mean

Program to calculate the value into hours and minutes, Specifically, you'll...

Specifically, you'll create a program that will hold minutes worked and assign a value. Calculate the value into hours and minutes. Display the result as shown in Figure 2. Reme

Develop a purchase order system, Develop a Purchase Order System Project...

Develop a Purchase Order System Project Description: Purchase Order (PO) is one of the first steps in the ordering process of a store. Before, we rely on manual computation t

I want selenium based test automation for java, I want Selenium Based Test ...

I want Selenium Based Test Automation for Java Based Web Application Project Description: I want some test cases to be automated to login to UI which is Java based web applic

Explain the term- comparing strings, Explain the term- Comparing Strings ...

Explain the term- Comparing Strings For comparing Strings never use == operator, use equals method of String class. - == operator compares addresses (shallow comparison) whi

What is jms, Java Message Service: An interface executed by most J2EE conta...

Java Message Service: An interface executed by most J2EE containers to give point-to-point queueing and topic (publish/subscribe) behavior. JMS is frequently used by EJB's that req

Explain the importance of abstract classes in java, Question: (a) Expl...

Question: (a) Explain the importance of abstract classes in Java with an appropriate example. (b) Explain what is meant by an interface in Java? Use a simple example to il

Assignment, h there, i want you please to make an full assignment due in Fr...

h there, i want you please to make an full assignment due in Friday :)

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