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DeadLockPrevention.java
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DeadLockPrevention.java
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// Prevents deadlock by not allowing circular wait
package com.jyotindersingh;
import java.util.Random;
public class DeadLockPrevention {
public static void main(String[] args) {
Intersection intersection = new Intersection();
Thread trainAThread = new Thread(new TrainA(intersection));
Thread trainBThread = new Thread(new TrainB(intersection));
trainAThread.start();
trainBThread.start();
}
public static class TrainA implements Runnable {
private Intersection intersection;
private Random random = new Random();
public TrainA(Intersection intersection) {
this.intersection = intersection;
}
@Override
public void run() {
while (true) {
long sleepingTime = random.nextInt(5);
try {
Thread.sleep(sleepingTime);
} catch (InterruptedException e) {
}
intersection.takeRoadA();
}
}
}
public static class TrainB implements Runnable {
private Intersection intersection;
private Random random = new Random();
public TrainB(Intersection intersection) {
this.intersection = intersection;
}
@Override
public void run() {
while (true) {
long sleepingTime = random.nextInt(5);
try {
Thread.sleep(sleepingTime);
} catch (InterruptedException e) {
}
intersection.takeRoadB();
}
}
}
public static class Intersection {
private Object roadA = new Object();
private Object roadB = new Object();
public void takeRoadA() {
synchronized (roadA) {
System.out.println("Road A is locked by thread " + Thread.currentThread().getName());
synchronized (roadB) {
System.out.println("Train is passing through Road A");
try {
Thread.sleep(1);
} catch (InterruptedException e) {
}
}
}
}
public void takeRoadB() {
synchronized (roadA) {
System.out.println("Road A is locked by thread " + Thread.currentThread().getName());
synchronized (roadB) {
System.out.println("Train is passing through Road B");
try {
Thread.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}
}