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

Java Login/Register Web CMS, I need help setting up and fleshing out a basi...

I need help setting up and fleshing out a basic outline/structure for a basic Java web app using an MVC pattern

What is spring configuration file, Spring configuration file is an XML file...

Spring configuration file is an XML file. This file having the classes information and defines how these classes are configured and introduced to each other.

Describe java operators, Describe java operators? An operator is a symb...

Describe java operators? An operator is a symbol which operates on one or more arguments to generate a result. The Hello World program is so easy it doesn't use any operators,

Garbage collection model, This assignment is about experimenting with the J...

This assignment is about experimenting with the Java runtime system's garbage collection model, and comparing it with the C++ manual memory allocation model. Below is the Garbage J

Data structures and algorithms using java, how soon can you complete a proj...

how soon can you complete a project?

Networking, which concept is used to connect the networking in java

which concept is used to connect the networking in java

Explain subclasses and polymorphism, Explain Subclasses and Polymorphism ? ...

Explain Subclasses and Polymorphism ? Car and Motorcycle are subclasses of MotorVehicle. If you instantiate a Car or a Motorcycle along with new, you can use in which object a

Arithmetic, 1-4 Problem Set: Arithmetic Consider the following statement wh...

1-4 Problem Set: Arithmetic Consider the following statement when responding to questions 1 and 2: Jim develops 5 Java applications a year. Joe develops 10 Java applications a year

Describe the superclass in inheritance, Describe the Superclass in Inherita...

Describe the Superclass in Inheritance ? In this example you start through defining a more common MotorVehicle class. public class MotorVehicle { private String licensePlat

Write a program to add of doubles in java, Write a program to add of double...

Write a program to add of doubles in java? Doubles are treated much the similar way, but now you obtain to use decimal points in the numbers. This is a same program which does

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