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

String concatenation and comparison, String concatenation and comparison ...

String concatenation and comparison public class StringTest { public static void main(String[] args) { int i = 4; int j = 5; System.out.println ("Hello" + i); // wi

Excel file to responsive css/html page, Excel File to Responsive CSS/HTML p...

Excel File to Responsive CSS/HTML page Project Description: Excel file to be converted into a responsive form for a site. In the excel file you will see where the input field

Currency calculator, I have to write a several line currency exchange rate ...

I have to write a several line currency exchange rate calculator.it wants me to use a variable and prompt var dollarAmount = Prompt("Enter amount in U.S. dollars:"); and give t

Explain init(), Explain init(), start(), stop(), and destroy() method? ...

Explain init(), start(), stop(), and destroy() method? The init() method is known as exactly once in an applet's life, while the applet is first loaded. It's generally used to

Describe j2ee?, J2EE (Java 2 Enterprise Edition) is an environment for depl...

J2EE (Java 2 Enterprise Edition) is an environment for deploying and developing enterprise applications on various operating system. The J2EE platform consists of J2EE components,

Need mahjong puzzle game, Need Mahjong puzzle game I want someone to mak...

Need Mahjong puzzle game I want someone to make this game ( Mahjong puzzle game) for me in Android ONLY. If you have high level programming knowledge in Android then please b

Pebble merchant, There is a pebble merchant. He sells the pebbles, that are...

There is a pebble merchant. He sells the pebbles, that are used for shining the floor. His main duty is to take the length of the room’s sides. But he sometimes mistakes doing tha

Javacard, I want to know if you can help me with a javacard programming pro...

I want to know if you can help me with a javacard programming project

Algorithm, #question)i) devising ii) validating and iii) tes...

#question)i) devising ii) validating and iii) testing of algorithms...

Uses of fileinputstream and fileoutputstream, Java Programming 1. Write...

Java Programming 1. Write a program in Java to find the highest of any five numbers. How do you compile and execute this Java program? 2. Write a program to explain the Exce

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