Erweiterung PU1 und weiteres
parent
8d5e2a3232
commit
173458e5f2
33
.classpath
33
.classpath
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@ -1,37 +1,14 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" output="target/classes" path="src/main/java">
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<classpathentry excluding="main/java/|main/resources/|test/java/|test/resources/" kind="src" path="src"/>
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<classpathentry kind="src" path="eigenes"/>
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<classpathentry exported="true" kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
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<attributes>
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<attribute name="optional" value="true"/>
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<attribute name="module" value="true"/>
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<attribute name="maven.pomderived" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
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<attributes>
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<attribute name="maven.pomderived" value="true"/>
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<attribute name="optional" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry kind="src" output="target/test-classes" path="src/test/java">
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<attributes>
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<attribute name="optional" value="true"/>
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<attribute name="maven.pomderived" value="true"/>
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<attribute name="test" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry excluding="**" kind="src" output="target/test-classes" path="src/test/resources">
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<attributes>
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<attribute name="maven.pomderived" value="true"/>
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<attribute name="test" value="true"/>
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<attribute name="optional" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
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<attributes>
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<attribute name="maven.pomderived" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
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<classpathentry exported="true" kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
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<attributes>
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<attribute name="maven.pomderived" value="true"/>
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</attributes>
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@ -0,0 +1,55 @@
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package philosopher2;
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import src.Chopstick;
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public class Philosopher implements Runnable {
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private final Chopstick leftChopstick;
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private final Chopstick rightChopstick;
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private final boolean isRightHanded; // Asymmetry flag
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public Philosopher(Chopstick leftChopstick, Chopstick rightChopstick, boolean isRightHanded) {
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this.leftChopstick = leftChopstick;
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this.rightChopstick = rightChopstick;
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this.isRightHanded = isRightHanded;
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}
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@Override
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public void run() {
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try {
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while (true) {
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think();
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if (isRightHanded) {
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synchronized (rightChopstick) {
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rightChopstick.pickUp();
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synchronized (leftChopstick) {
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leftChopstick.pickUp();
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eat();
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leftChopstick.putDown();
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}
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rightChopstick.putDown();
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}
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} else {
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synchronized (leftChopstick) {
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leftChopstick.pickUp();
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synchronized (rightChopstick) {
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rightChopstick.pickUp();
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eat();
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rightChopstick.putDown();
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}
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leftChopstick.putDown();
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}
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}
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}
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} catch (InterruptedException e) {
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Thread.currentThread().interrupt();
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}
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}
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private void think() {
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System.out.println(Thread.currentThread().getName() + " is thinking.");
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}
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private void eat() {
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System.out.println(Thread.currentThread().getName() + " is eating.");
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}
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}
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@ -0,0 +1,56 @@
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package philosopher3;
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import src.Chopstick;
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public class Philosopher implements Runnable {
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private final Chopstick leftChopstick;
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private final Chopstick rightChopstick;
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public Philosopher(Chopstick leftChopstick, Chopstick rightChopstick) {
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this.leftChopstick = leftChopstick;
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this.rightChopstick = rightChopstick;
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}
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@Override
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public void run() {
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try {
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while (true) {
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think();
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if (tryToEat()) {
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eat();
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}
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}
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} catch (InterruptedException e) {
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Thread.currentThread().interrupt();
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}
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}
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private void think() {
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System.out.println(Thread.currentThread().getName() + " is thinking.");
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}
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private boolean tryToEat() throws InterruptedException {
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synchronized (leftChopstick) {
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leftChopstick.pickUp();
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if (!tryPickUpRightChopstick()) {
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leftChopstick.putDown();
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return false; // Couldn't get both chopsticks, return to thinking
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}
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}
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return true;
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}
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private boolean tryPickUpRightChopstick() throws InterruptedException {
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synchronized (rightChopstick) {
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rightChopstick.pickUp();
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return true;
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}
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}
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private void eat() throws InterruptedException {
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System.out.println(Thread.currentThread().getName() + " is eating.");
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rightChopstick.putDown();
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leftChopstick.putDown();
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}
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}
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@ -0,0 +1,19 @@
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package src;
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import java.util.concurrent.Semaphore;
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public class Arbitrator {
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private final Semaphore semaphore;
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public Arbitrator(int maxPhilosophers) {
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this.semaphore = new Semaphore(maxPhilosophers - 1); // Allow up to N-1 philosophers to eat
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}
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public void requestPermission(Philosopher philosopher) throws InterruptedException {
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semaphore.acquire(); // Request permission to eat
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}
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public void releasePermission(Philosopher philosopher) {
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semaphore.release(); // Release permission after eating
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}
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}
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@ -0,0 +1,20 @@
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package src;
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public class Chopstick {
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private boolean inUse = false;
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// Ein Philosophen-Thread nimmt das Stäbchen
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public synchronized void pickUp() throws InterruptedException {
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while (inUse) {
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wait(); // Warten, bis das Stäbchen verfügbar ist
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}
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inUse = true;
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}
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// Ein Philosophen-Thread legt das Stäbchen wieder zurück
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public synchronized void putDown() {
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inUse = false;
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notifyAll(); // Andere wartende Philosophen benachrichtigen
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}
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}
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@ -0,0 +1,43 @@
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package src;
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public class Philosopher implements Runnable {
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private final Chopstick leftChopstick;
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private final Chopstick rightChopstick;
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private final Arbitrator arbitrator;
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public Philosopher(Chopstick leftChopstick, Chopstick rightChopstick, Arbitrator arbitrator) {
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this.leftChopstick = leftChopstick;
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this.rightChopstick = rightChopstick;
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this.arbitrator = arbitrator;
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}
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@Override
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public void run() {
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try {
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while (true) {
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think();
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arbitrator.requestPermission(this); // Request permission from the arbitrator
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synchronized (leftChopstick) {
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leftChopstick.pickUp();
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synchronized (rightChopstick) {
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rightChopstick.pickUp();
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eat();
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rightChopstick.putDown();
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}
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leftChopstick.putDown();
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}
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arbitrator.releasePermission(this); // Release permission
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}
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} catch (InterruptedException e) {
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Thread.currentThread().interrupt();
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}
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}
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private void think() {
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System.out.println(Thread.currentThread().getName() + " is thinking.");
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}
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private void eat() {
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System.out.println(Thread.currentThread().getName() + " is eating.");
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}
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}
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