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

I need integrate template to java system, I need integrate template to Java...

I need integrate template to Java system Project Description: We have around 60 files for a java backend and want to implement a template, the system is complete it requires

Design a game in java, The game of Kala is played on a rectangular board: ...

The game of Kala is played on a rectangular board: In front of each player are six pits numbered 1 to 6 (called the 'side pits'). To the right of a player's side pits is a

Pattern printing program, Question Using 3 level of nested for loop, writ...

Question Using 3 level of nested for loop, write a program that will produce the output as below.

Design a game in java, Ten pigs were all in a pen, enjoying their morning s...

Ten pigs were all in a pen, enjoying their morning slop when a bird flew down from a nearby tree and began picking all the best bits out from the trough. This greatly perturbed the

Write code in javascript to display the odd numbers, Write code in JavaScri...

Write code in JavaScript to display the odd numbers among 20 to 100 using FOR statement? Note: No required to write whole HTML program. Just JavaScript code of require elemen

What does a simple spring application contain, These applications are like ...

These applications are like any Java application. They are made up of not many classes, each performing a particular purpose within the application. But these classes are configure

Develop tennis draw software, Project Description: We need to develop so...

Project Description: We need to develop software that has a database of players with the ability to delete and add players at will, once captured there can be a draw to set them

Imagemagick or same as text png generation, Imagemagick or same as text png...

Imagemagick or same as text png/jpg generation expert needed Project Description: Require someone who is experienced with generating text images. You will use any of the soft

Write a bouncing ball game, Write a bouncing ball video game. The game is s...

Write a bouncing ball video game. The game is similar to the one described and depicted in Figure of the text book. The balls bounces within the screen where the two horizontal wal

Write Your Message!

Captcha
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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd