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

What is image processing, What is image processing? It field of compute...

What is image processing? It field of computer whereas we enhance and manipulate the graphics. Like it is used to recover old photograph and through processing we can revive

Describe the if statement in java, Describe the if statement in Java ? ...

Describe the if statement in Java ? All but the most trivial computer programs required to form decisions. They test a condition and operate in a different way based on the out

What is public static void main signifies, What is 'public static void main...

What is 'public static void main (String args[ ] ) ' signifies? Access specifier is the 'public' keyword. 'static' keyword allows main() to called without instantiating

What is xmlbeanfactory, BeanFactory has many executions in Spring. But one ...

BeanFactory has many executions in Spring. But one of the most useful one is org.springframework.beans.factory.xml.XmlBeanFactory, which loads its beans based on the definitions ha

Explain rmi, RMI is a set of APIs that permits to build distributed applica...

RMI is a set of APIs that permits to build distributed applications. RMI uses interfaces to describe remote objects to turn local method invocations into remote method invocations.

Describe what is meant by a constructor in java, Question: (a) Describe...

Question: (a) Describe what is meant by a ‘constructor' in Java. Use a simple example to illustrate your answer. (b) Differentiate between a class method and an instance me

What is struts framework, Struts framework is an open-source framework for ...

Struts framework is an open-source framework for producing the web applications in Java EE, based on MVC-2 architecture. It uses and extends the Java Servlet API. Struts are robust

What is the order of function invocation in an applet? , The Applet's life ...

The Applet's life cycle functions are as follows: public void init() : Initialization function called only once by the browser. public void start() : Method called after

Discuss features of java, Question 1 Discuss features of JAVA Question...

Question 1 Discuss features of JAVA Question 2 What are primitive data types? Discuss Question 3 Explain data conversion function ValueOf ()? Question 4 What are th

Prepare a java program to read .gpx files, Prepare a Java program to read ....

Prepare a Java program to read .GPX files Project Description: Prepare a Java program (GPX_Tracks_to_Text.Java) for Windows to: - Read every .GPX file in a provide drive a

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