class DeepThoughtTask implements Runnable {
static int finalResult = 0;
private int computeResult() {
return 1; // assume this is a long-running task
}
public void run() {
long partialResult = computeResult(); // lock-free
synchronized (DeepThoughtTask.class) {
finalResult += partialResult;
}
}
}
class ProcessorHog implements Runnable {
public void run() {
synchronized (DeepThoughtTask.class) {
try {
Thread.sleep(3000); // keep the CPU busy
} catch(InterruptedException ex) {
System.out.println(ex);
}
}
}
}
public class Main {
public static void main(String args[]) throws Exception {
new Thread(new ProcessorHog()).start();
Thread.sleep(1000); // simulates other work being done
DeepThoughtTask task = new DeepThoughtTask();
for (int i = 0; i < 42; i++) {
new Thread(task).start();
}
Thread.sleep(1000); // ad-hoc wait till threads finish
System.out.println("answer: " + DeepThoughtTask.finalResult);
}
}
