package thread;
 
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class ConTest {
	
	 final Lock lock = new ReentrantLock();
	 final Condition condition = lock.newCondition();
 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ConTest test = new ConTest();
	    Producer producer = test.new Producer();
	    Consumer consumer = test.new Consumer();
	          
	    
	    consumer.start(); 
	    producer.start();
	}
	
	 class Consumer extends Thread{
         
	        @Override
	        public void run() {
	            consume();
	        }
	          
	        private void consume() {
	           	             
	                try {
	                	   lock.lock();
	                    System.out.println("我在等一個(gè)新信號(hào)"+this.currentThread().getName());
	                    condition.await();
	                    
	                } catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					} finally{
						System.out.println("拿到一個(gè)信號(hào)"+this.currentThread().getName());
	                    lock.unlock();
	                }
	            
	        }
	    }
	 
	 class Producer extends Thread{
         
	        @Override
	        public void run() {
	            produce();
	        }
	          
	        private void produce() {	             
	                try {
	                	   lock.lock();
	                       System.out.println("我拿到鎖"+this.currentThread().getName());
	                        condition.signalAll();	                         
	                    System.out.println("我發(fā)出了一個(gè)信號(hào)："+this.currentThread().getName());
	                } finally{
	                    lock.unlock();
	                }
	            }
	 }
	    
}

package thread;

import java.util.PriorityQueue;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class ConTest2 {
    private int queueSize = 10;
    private PriorityQueue<Integer> queue = new PriorityQueue<Integer>(queueSize);
    private Lock lock = new ReentrantLock();
    private Condition notFull = lock.newCondition();
    private Condition notEmpty = lock.newCondition();
        
    public static void main(String[] args) throws InterruptedException  {
        ConTest2 test = new ConTest2();
        Producer producer = test.new Producer();
        Consumer consumer = test.new Consumer();	          
        producer.start();
        consumer.start();
        Thread.sleep(0);
        producer.interrupt();
        consumer.interrupt();
    }
        
    class Consumer extends Thread{	          
        @Override
        public void run() {
            consume();
        }
        volatile boolean flag=true;  
        private void consume() {
            while(flag){
                lock.lock();
                try {
                    while(queue.isEmpty()){
                        try {
                            System.out.println("隊(duì)列空，等待數(shù)據(jù)");
                            notEmpty.await();
                        } catch (InterruptedException e) {	                          
                            flag =false;
                        }
                    }
                    queue.poll();                //每次移走隊(duì)首元素
                    notFull.signal();
                    System.out.println("從隊(duì)列取走一個(gè)元素，隊(duì)列剩余"+queue.size()+"個(gè)元素");
                } finally{
                    lock.unlock();
                }
            }
        }
    }
        
    class Producer extends Thread{	          
        @Override
        public void run() {
            produce();
        }
        volatile boolean flag=true;  
        private void produce() {
            while(flag){
                lock.lock();
                try {
                    while(queue.size() == queueSize){
                        try {
                            System.out.println("隊(duì)列滿，等待有空余空間");
                            notFull.await();
                        } catch (InterruptedException e) {
                            
                            flag =false;
                        }
                    }
                    queue.offer(1);        //每次插入一個(gè)元素
                    notEmpty.signal();
                    System.out.println("向隊(duì)列取中插入一個(gè)元素，隊(duì)列剩余空間："+(queueSize-queue.size()));
                } finally{
                    lock.unlock();
                }
            }
        }
    }
}

public abstract class AbstractQueuedLongSynchronizer
    extends AbstractOwnableSynchronizer
    implements java.io.Serializable {

public class ConditionObject implements Condition, java.io.Serializable {
    private static final long serialVersionUID = 1173984872572414699L;
    /** First node of condition queue. */
    private transient Node firstWaiter;
    /** Last node of condition queue. */
    private transient Node lastWaiter;

public final void await() throws InterruptedException {
    if (Thread.interrupted())
        throw new InterruptedException();
    Node node = addConditionWaiter(); //將當(dāng)前線程包裝下后，
    //添加到Condition自己維護(hù)的一個(gè)鏈表中。
    int savedState = fullyRelease(node);//釋放當(dāng)前線程占有的鎖，從demo中看到，
    //調(diào)用await前，當(dāng)前線程是占有鎖的
    int interruptMode = 0;
    while (!isOnSyncQueue(node)) {
        //釋放完畢后，遍歷AQS的隊(duì)列，看當(dāng)前節(jié)點(diǎn)是否在隊(duì)列中，
        //不在 說(shuō)明它還沒(méi)有競(jìng)爭(zhēng)鎖的資格，所以繼續(xù)將自己沉睡。
        //直到它被加入到隊(duì)列中，聰明的你可能猜到了，
        //沒(méi)有錯(cuò)，在singal的時(shí)候加入不就可以了？
    LockSupport.park(this);
    if ((interruptMode = checkInterruptWhileWaiting(node)) != 0)
        break;
    }  
//被喚醒后，重新開(kāi)始正式競(jìng)爭(zhēng)鎖，同樣，如果競(jìng)爭(zhēng)不到還是會(huì)將自己沉睡，等待喚醒重新開(kāi)始競(jìng)爭(zhēng)。
if (acquireQueued(node, savedState) && interruptMode != THROW_IE)
    interruptMode = REINTERRUPT;
if (node.nextWaiter != null)
    unlinkCancelledWaiters();
if (interruptMode != 0)
    reportInterruptAfterWait(interruptMode);
}

/**
    * Adds a new waiter to wait queue.
    * @return its new wait node
    */
private Node addConditionWaiter() {
    Node t = lastWaiter;
    // If lastWaiter is cancelled, clean out.
    if (t != null && t.waitStatus != Node.CONDITION) {
        unlinkCancelledWaiters();
        t = lastWaiter;
    }
    Node node = new Node(Thread.currentThread(), Node.CONDITION);
    if (t == null)
        firstWaiter = node;
    else
        t.nextWaiter = node;
    lastWaiter = node;
    return node;
}

public final void signal() {
 if (!isHeldExclusively())
    throw new IllegalMonitorStateException();
 Node first = firstWaiter; //firstWaiter為condition自己維護(hù)的一個(gè)鏈表的頭結(jié)點(diǎn)，
 //取出第一個(gè)節(jié)點(diǎn)后開(kāi)始喚醒操作
 if (first != null)
    doSignal(first);
}

final void lock() {
    if (compareAndSetState(0, 1))
        setExclusiveOwnerThread(Thread.currentThread());
    else
        acquire(1);
}