package concurrency;

import java.io.*;

import java.util.concurrent.*;

import java.util.*;

/**

* RUN:

* javac concurrency/SimplePriorities.java && java concurrency.SimplePriorities

*

* OUTPUT:

*

*/

public class SimplePriorities implements Runnable {

private int countDown = 5;

private volatile double d;

private int priority;

public SimplePriorities(int priority) {

this.priority = priority;

}

public String toString() {

return Thread.currentThread() + ": " + countDown;

}

public void run() {

Thread.currentThread().setPriority(priority);

while (true) {

for (int i = 1; i < 100000; i++) {

d += (Math.PI + Math.E) / (double)i;

if (i % 1000 == 0) {

Thread.yield();

}

}

System.out.println(this);

if (--countDown == 0) {

return;

}

}

}

public static void main(String[] args) {

ExecutorService exec = Executors.newCachedThreadPool();

for (int i = 0; i < 5; i++) {

exec.execute(new SimplePriorities(Thread.MIN_PRIORITY));

}

exec.execute(new SimplePriorities(Thread.MAX_PRIORITY));

exec.shutdown();

}

}