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 the string concatenation, What is the String Concatenation + Op...

What is the String Concatenation + Operator is employed to concatenate strings - System.out.pritln ("Hello" + "World") will print Hello World on console String concatenat

State the java programmer efficiency, State the Java Programmer Efficiency ...

State the Java Programmer Efficiency Faster Development Building an application in Java takes about 50% less time than in C or C++. So, faster time to market Java is said to

Program to develop a multimedia simulation , Normal 0 false f...

Normal 0 false false false EN-IN X-NONE X-NONE

Important nodes, there are N nodes in a graph, the graph isuni directional ...

there are N nodes in a graph, the graph isuni directional with M edges of these M nodes in a graph, there are K nodes which are important nodes. given initial position I within thi

Calculates number of negative and positive numbers in array, Question 3 ...

Question 3 Using this line: var posneg : array [1..15] of integer; Write a program that calculates the number of negative and positive numbers in the array. Users will

Unix-like CLI in Java (simple), The assignment is implementing a CLI in Jav...

The assignment is implementing a CLI in Java with several usable commands, using Threads.

Explain the for loop in java, Explain the for loop in java? // This is ...

Explain the for loop in java? // This is the Hello program in Java class Hello { public static void main (String args[]) { System.out.print("Hello "); // Say Hello

What are not allowed within the ejb container? , In  order  to  provide  po...

In  order  to  provide  portable  and  reliable  EJB  elements,  the  following  restrictions  apply  to  EJB  code implementation: 1. Avoid using static non-final fields. Defin

Derfine j2ee in detail?, A J2EE component is a self-contained functional so...

A J2EE component is a self-contained functional software unit that is assembled into a J2EE application with its related files and classes and interacts with other components. The

Difference between a scrollbar and a scrollpanel in jsp, A Scrollbar is a C...

A Scrollbar is a Component while Scroll Panel is a Container. A Scroll Panel handles its own events and performs its own scrolling.

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