Consider the BadReaderWriter.java program attached with this. The program has three threads, namely, one reader thread and two writer threads, and they all access the same list of numbers. The reader thread reads the list and prints it to the terminal. The writer threads append numbers to the list. At any point in time, if either of the writer threads finds that the list contains n elements, then it appends the number n + 1 to the list. Run this program, examine the output, and identify the problems. Fix these problems by implementing the acquireLock() and releaseLock() methods in the code.
Consider the BadReaderWriter.java program attached with this. The program has three threads, namely, one reader thread and two writer threads, and they all access the same list of numbers. The reader thread reads the list and prints it to the terminal. The writer threads append numbers to the list. At any point in time, if either of the writer threads finds that the list contains n elements, then it appends the number n + 1 to the list. Run this program, examine the output, and identify the problems. Fix these problems by implementing the acquireLock() and releaseLock() methods in the code.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
Consider the BadReaderWriter.java program attached with this. The program has three threads, namely, one reader thread and two writer threads, and they all access the same list of numbers. The reader thread reads the list and prints it to the terminal. The writer threads append numbers to the list. At any point in time, if either of the writer threads finds that the list contains n elements, then it appends the number n + 1 to the list.
Run this program, examine the output, and identify the problems.
Fix these problems by implementing the acquireLock() and releaseLock() methods in the code.
Transcribed Image Text:Activities
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BadReaderWriter.java
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1 import java.util.Arraylist;
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3 public class BadReaderwriter {
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private statc votd acquirelLock() throws InterruptedException {
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// TODO: Add code for acqutring lock for critical section
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private static void releaselLock() throws InterruptedException {
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// TODO: Add code for releastng lock for critical section
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stattc class ReaderThread extends Thread {
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String name = "";
ArrayList<Integer> numbers;
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Reader Thread(String name, ArrayList<Integer> numbers) {
this.name = name;
this.numbers = numbers;
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public votd run() {
for (int count = 0; count < 20; count++) {
try {
acqutrelock();
try {
Systen.out.printin(>
Systen.out.flush();
+ name +
read:+ numbers);
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finally {
releaselock();
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} catch (InterruptedException e) {
e.printStackTrace();
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stattc class WriterThread extends Thread (
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String name = "";
Arraylist<Integer> numbers;
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WriterThread(String name, Arraylist<Integer> numbers) {
this.name = name;
this.numbers numbers;
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public votd run() (
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![Activities
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statte class WriterThread extends Thread {
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String name = "":
ArrayList<Integer> numbers;
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WriterThread(string name, ArrayList<Integer> numbers) {
this.name = name;
this.numbers = numbers;
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public votd run() {
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for (int count = 0; count < 10; count++) {
try (
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acqutrelock();
try (
Integer entry numbers.stze() + 1;
numbers.add(entry);
Systen.out.printin(>>>
Systen.out.flush();
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+ name + added: +
+ entry);
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finally {
releaselock();
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} catch (InterruptedException e) {
e.printstackTrace();
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public static void main(String[] args) {
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Arraylist<Integer> listofNumbers = new Arraylist<Integer>();
ReaderThread ti = new Reader Thread("reader1", ltstofNumbers);
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WriterThread t2 = new Writer Thread("writer1", ltstofNumbers);
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WriterThread t3 = new WriterThread("writer2", ltstofNumbers);
t1.start();
t2.start();
t3.start();
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95 }
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BadReaderWriter.java
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statte class WriterThread extends Thread {
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String name = "":
ArrayList<Integer> numbers;
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WriterThread(string name, ArrayList<Integer> numbers) {
this.name = name;
this.numbers = numbers;
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public votd run() {
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for (int count = 0; count < 10; count++) {
try (
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acqutrelock();
try (
Integer entry numbers.stze() + 1;
numbers.add(entry);
Systen.out.printin(>>>
Systen.out.flush();
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+ name + added: +
+ entry);
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finally {
releaselock();
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} catch (InterruptedException e) {
e.printstackTrace();
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public static void main(String[] args) {
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Arraylist<Integer> listofNumbers = new Arraylist<Integer>();
ReaderThread ti = new Reader Thread("reader1", ltstofNumbers);
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WriterThread t2 = new Writer Thread("writer1", ltstofNumbers);
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WriterThread t3 = new WriterThread("writer2", ltstofNumbers);
t1.start();
t2.start();
t3.start();
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95 }
Java Tab Width: 8
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