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

Need jvc everio stream converter, Need JVC Everio stream converter Proje...

Need JVC Everio stream converter Project Description: JVC Everio is a brand of cameras capable of real time streaming/ encodinig. To get the video from a PC or a mobile de

Coarse grained soa, Coarse Grained SOA : Services are also could be coa...

Coarse Grained SOA : Services are also could be coarse grained. E.g:   You may have a purchase element with individual functions to make a purchase order, add line items, and a

Payroll calculator application, Payroll Calculator for Both Hourly and Comm...

Payroll Calculator for Both Hourly and Commission Employees In assignment 13, we will create a payroll calculator that calculates   gross pay ,   taxes , and   net pay   fo

Explain what is multilevel inheritance, Explain what is Multilevel Inherita...

Explain what is Multilevel Inheritance ? The Car-Motorcycle-MotorVehicle instances showed single-level inheritance. There's nothing to stop you from going next. You can describ

Support for web and enterprise web applications, Support for Web and Enterp...

Support for Web and Enterprise Web Applications Java offers an extensive support for the development of web and enterprise applications Servlets, JSP, Applets, RMI, JDBC, EJBs

What is aop(aspect oriented programming)?, Separating your business logic w...

Separating your business logic with other functionality such as services, Loggers etc, making classess more cohesive.

What is the output of the following javascript code, What is the output of ...

What is the output of the following JavaScript code? name="Ali Akbar"; document.write(name.charAt(4)) ;

Write responsibility of developer-executive -support team, Write responsibi...

Write responsibilities of the followings 1. Developer a) Module level design. b) Coding c) Unit testing 2. Executive Team a) Responsible for the day to day operations. b) A

Use array to store values in a program, 1) Listing of the source code ( nam...

1) Listing of the source code ( named Rainfall.java ) for your program 2) Two sample output/execution/runs of your program Optional Group Work: This assignment may be done in

#title.swithcase, 2. Problem Description: A Java program needs to be writte...

2. Problem Description: A Java program needs to be written to display the result of following operations based input character. The table for input character with operations is : I

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