CyclicBarrier
private final AtomicInteger count = new AtomicInteger(0);
private final CyclicBarrier cyclicBarrier = new CyclicBarrier(3);
private volatile int state;
public void first() throws InterruptedException {
for (int i = 0; i < 15; i++) {
if (state == 0) {
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
state = 1;
}
try {
cyclicBarrier.await();
} catch (BrokenBarrierException e) {
e.printStackTrace();
}
}
}
public void second() throws InterruptedException {
for (int i = 0; i < 15; i++) {
if (state == 1) {
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
state = 2;
}
try {
cyclicBarrier.await();
} catch (BrokenBarrierException e) {
e.printStackTrace();
}
}
}
Thread.yield()
private final AtomicInteger count = new AtomicInteger(0);
private volatile int state;
public void first() {
for (int i = 0; i < 5; i++) {
while (state != 0) {
Thread.yield();
}
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
state = 1;
}
}
public void second() {
for (int i = 0; i < 5; i++) {
while (state != 1) {
Thread.yield();
}
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
state = 2;
}
}
public void third() {
for (int i = 0; i < 5; i++) {
while (state != 2) {
Thread.yield();
}
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
state = 0;
}
}
Semaphore
private final AtomicInteger count = new AtomicInteger(0);
private final Semaphore first = new Semaphore(1);
private final Semaphore second = new Semaphore(0);
private final Semaphore third = new Semaphore(0);
public void first() throws InterruptedException {
for (int i = 0; i < 5; i++) {
first.acquire();
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
second.release();
}
}
public void second() throws InterruptedException {
for (int i = 0; i < 5; i++) {
second.acquire();
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
third.release();
}
}
public void third() throws InterruptedException {
for (int i = 0; i < 5; i++) {
third.acquire();
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
first.release();
}
CountDownLatch
private final AtomicInteger count = new AtomicInteger(0);
private CountDownLatch first = new CountDownLatch(0);
private CountDownLatch second = new CountDownLatch(1);
private CountDownLatch third = new CountDownLatch(1);
public void first() throws InterruptedException {
for (int i = 0; i < 5; i++) {
first.await();
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
first = new CountDownLatch(1);
second.countDown();
}
}
public void second() throws InterruptedException {
for (int i = 0; i < 5; i++) {
second.await();
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
second = new CountDownLatch(1);
third.countDown();
}
}
public void third() throws InterruptedException {
for (int i = 0; i < 5; i++) {
third.await();
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
third = new CountDownLatch(1);
first.countDown();
}
}
LockSupport
private final AtomicInteger count = new AtomicInteger(0);
private Map map = new ConcurrentHashMap<>(4);
private volatile int state;
public void first() throws InterruptedException {
map.put("first", Thread.currentThread());
for (int i = 0; i < 5; i++) {
while (state != 0) {
LockSupport.park();
}
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
state = 1;
LockSupport.unpark(map.get("second"));
}
}
public void second() throws InterruptedException {
map.put("second", Thread.currentThread());
for (int i = 0; i < 5; i++) {
while (state != 1) {
LockSupport.park();
}
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
state = 2;
LockSupport.unpark(map.get("third"));
}
}
public void third() throws InterruptedException {
map.put("third", Thread.currentThread());
for (int i = 0; i < 5; i++) {
while (state != 2) {
LockSupport.park();
}
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
state = 0;
LockSupport.unpark(map.get("first"));
}
}
ReentrantLock + Condition
private final AtomicInteger count = new AtomicInteger(0);
private final Lock lock = new ReentrantLock();
private final Condition first = lock.newCondition();
private final Condition second = lock.newCondition();
private final Condition third = lock.newCondition();
private volatile int state;
public void first() throws InterruptedException {
lock.lock();
try {
for (int i = 0; i < 5; i++) {
while (state != 0) {
first.await();
}
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
state = 1;
second.signal();
}
} finally {
lock.unlock();
}
}
public void second() throws InterruptedException {
lock.lock();
try {
for (int i = 0; i < 5; i++) {
while (state != 1) {
second.await();
}
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
state = 2;
third.signal();
}
} finally {
lock.unlock();
}
}
public void third() throws InterruptedException {
lock.lock();
try {
for (int i = 0; i < 5; i++) {
while (state != 2) {
third.await();
}
for (int j = 0; j < 5; j++) {
System.out.println(
Thread.currentThread().getName() + "-" + count.incrementAndGet());
}
state = 0;
first.signal();
}
} finally {
lock.unlock();
}
}
