class demo{
private ReentrantLock lock =new ReentrantLock();
private Condition cb = lock.newCondition();
private Condition cc = lock.newCondition();
private Condition ca = lock.newCondition();
private int num = 1;
public void loopA(int epoch){
lock.lock();
try {
if(num!=1){
ca.await();
}
for(int i=0;i<5;i++){
System.out.println(Thread.currentThread().getName()+" "+i+"\t"+epoch);
}
num=2;
cb.signal();
} catch (Exception e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}
public void loopB(int epoch){
lock.lock();
try {
if(num!=2){
cb.await();
}
for(int i=0;i<5;i++){
System.out.println(Thread.currentThread().getName()+" "+i+"\t"+epoch);
}
num=3;
cc.signal();
} catch (Exception e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}
public void loopC(int epoch){
lock.lock();
try {
if(num!=3){
cc.await();
}
for(int i=0;i<5;i++){
System.out.println(Thread.currentThread().getName()+" "+i+"\t"+epoch);
}
num=1;
ca.signal();
} catch (Exception e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}
}
public class alterDemo {
public static void main(String[] args) {
demo d = new demo();
new Thread(new Runnable() {
@Override
public void run() {
for(int i=0;i<20;i++)
{
d.loopA(i);
}
}
},"A").start();
new Thread(new Runnable() {
@Override
public void run() {
for(int i=0;i<20;i++)
{
d.loopB(i);
}
}
},"B").start();
new Thread(new Runnable() {
@Override
public void run() {
for(int i=0;i<20;i++)
{
d.loopC(i);
}
}
},"C").start();
}
}
