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ReentrantLockæºç ä¹‹äºŒunlockæ–ÒŽ³•è§£æž(é”çš„é‡Šæ”¾)

zhangxl — Fri, 19 Aug 2011 07:24:00 GMT

å‰é¢ä¸€èŠ?/a>ä¸ï¼Œæˆ‘ä»¬åˆ†æžäº†ReentrantLock.lock()æ–ÒŽ³•åQŒæŽ¥ä¸‹æ¥æˆ‘ä»¬æŽ¥ç€åˆ†æžReentrantLock.unlock()æ–ÒŽ³•ã€?br />

1.ReentrantLock.unlock()åˆ†æž

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(2)å¦‚æžœ(1)˜q”å›žçš„æ˜¯trueåQŒè¯´æ˜Žé”å®Œå…¨é‡Šæ”¾ã€‚æŽ¥ä¸‹æ¥ž®†æ£€æŸ¥ç‰å¾…é˜Ÿåˆ—ï¼Œòq‰™€‰æ‹©ä¸€ä¸ªwaitStatuså¤„äºŽ½{‰å¾…çŠ¶æ€çš„èŠ‚ç‚¹ä¸‹çš„¾U¿ç¨‹unpark(æ¢å¤)åQŒé€‰æ‹©çš„ä¾æ®æ˜¯ä»Žå°¾èŠ‚ç‚¹å¼€å§‹ï¼Œé€‰å–æœ€é è¿‘å¤´èŠ‚ç‚¹çš„½{‰å¾…èŠ‚ç‚¹,åŒæ—¶æ¸…ç†é˜Ÿåˆ—ä¸çº¿½E‹è¢«å–æ¶ˆçš„èŠ‚ç‚¹ï¼›
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1java.util.concurrent.locks.ReentrantLock
2 public void unlock() {
3        sync.release(1);
4 }
5
6java.util.concurrent.locks.AbstractQueuedSynchronizer
7public final boolean release(int arg) {
8        if (tryRelease(arg)) {
9            Node h = head;
10            if (h != null && h.waitStatus != 0)
11                unparkSuccessor(h);
12            return true;
13        }
14        return false;
15    }
16
17
18 protected final boolean tryRelease(int releases) {
19            int c = getState() - releases;   //é‡å…¥é”åŠ é”çš„‹Æ¡æ•°-é‡Šæ”¾æ•°é‡
20            if (Thread.currentThread() != getExclusiveOwnerThread())   //åˆ¤æ–ç‹¬å é”æ˜¯å¦äØ“å½“å‰¾U¿ç¨‹æ‰€æœ?/span>
21                throw new IllegalMonitorStateException();
22            boolean free = false;
23            if (c == 0) {       //åŠ é”‹Æ¡æ•°=é‡Šæ”¾æ•°é‡
24                free = true;
25                setExclusiveOwnerThread(null);     //æ¸…é™¤é”æ‹¥æœ‰è€…æ ‡è¯?/span>
26            }
27            setState(c);        //è®„¡½®åŠ é”çŠ¶æ€?/span>
28            return free;
29        }
30
31
32 /**
33     * Wakes up node's successor, if one exists.
34     *
35     * @param node the node
36     */
37    private void unparkSuccessor(Node node) {
38        /*
39         * Try to clear status in anticipation of signalling.  It is
40         * OK if this fails or if status is changed by waiting thread.
41         */
42        compareAndSetWaitStatus(node, Node.SIGNAL, 0);    //æ¸…é™¤å¤´èŠ‚ç‚¹signalçŠ¶æ€?/span>
43
44        /*
45         * Thread to unpark is held in successor, which is normally
46         * just the next node.  But if cancelled or apparently null,
47         * traverse backwards from tail to find the actual
48         * non-cancelled successor.
49         */
50        Node s = node.next;
51        if (s == null || s.waitStatus > 0) {    //½{‰å¾…é˜Ÿåˆ—å”¤é†’çš„ç«žäº‰æ»¡‘³FIFOåQŒæœ¬ŒDµä»£ç ä¸»è¦æ˜¯å¯ÀL‰¾æœ€é è¿‘å¤´èŠ‚ç‚¹çš„åQŒä¸”waitStatusä¸ºsignalã€conditionçš„é“¾è¡¨èŠ‚ç‚?/span>
52            s = null;
53            for (Node t = tail; t != null && t != node; t = t.prev)
54                if (t.waitStatus <= 0)
55                    s = t;
56        }
57        if (s != null)
58            LockSupport.unpark(s.thread);
59    }

zhangxl 2011-08-19 15:24 å‘è¡¨è¯„è®º

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ReentrantLockæºç ä¹‹ä¸€lockæ–ÒŽ³•è§£æž(é”çš„èŽ·å–)

zhangxl — Thu, 18 Aug 2011 06:12:00 GMT

é˜…è¯»å…¨æ–‡

zhangxl 2011-08-18 14:12 å‘è¡¨è¯„è®º

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java ½{‰å¾…é€šçŸ¥/æ¡äšgå˜é‡çš„åŒºåˆ«æµ…æž?/title>http://www.aygfsteel.com/zhanglongsr/articles/355210.htmlzhangxlzhangxlThu, 28 Jul 2011 04:11:00 GMThttp://www.aygfsteel.com/zhanglongsr/articles/355210.htmlhttp://www.aygfsteel.com/zhanglongsr/comments/355210.htmlhttp://www.aygfsteel.com/zhanglongsr/articles/355210.html#Feedback0http://www.aygfsteel.com/zhanglongsr/comments/commentRss/355210.htmlhttp://www.aygfsteel.com/zhanglongsr/services/trackbacks/355210.html    javaåœ?.2ç‰ˆæœ¬å¼•å…¥wait-and-notifyæœºåˆ¶åQŒç”¨äºŽçº¿½E‹é—´é€šä¿¡åQŒå®ƒèƒ½å¤Ÿè®©æŸä¸ªçº¿½E‹ä¸Žå…¶ä»–¾U¿ç¨‹åœ¨ç‰¹å®šæ¡ä»¶ç¬¦åˆæ—¶˜q›è¡Œé€šä¿¡åQ›è€Œæ¡ä»¶å˜é‡æ˜¯åœ?.5ç‰ˆæœ¬ä¸concurrencyåŒ…ä¸æä¾›çš„ï¼Œæ¡äšgå˜é‡æ˜¯ä¸€¿Uæœ‰å…¶å¤šå…¶ä»–å¤šçº¿½E‹ç³»¾lŸæ‰€æä¾›çš„åŒæ¥ç±»åž‹ï¼Œå®ƒä¸Žjavaçš„wai-and-notifyæœºåˆ¶éžå¸¸¾cÖM¼¼åQŒä¸‹é¢æˆ‘ä»¬é€šè¿‡å®žä¾‹çš„æ–¹å¼æ¥æŽ¢è®¨ä»–ä»¬ä¹‹é—´çš„åŒºåˆ«ã€?br />     wai-and-notify½CÞZ¾‹ä»£ç åQ?
package com.zxl.thread.notify;
/** *//**
*
* @author zhangxl
*
*/
public class SynThread1 extends Thread {

    private Object lockObj;
    private volatile int i = 0;
    public SynThread1(Object lockObj){
        this.lockObj = lockObj;
    }

    public void run(){

        synchronized(lockObj){
            while(true){
                if(i==0){
                    try {
                        System.out.println(Thread.currentThread().getName()+" will be waiting.");
                        lockObj.wait();
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }

                System.out.println(Thread.currentThread().getName()+": i="+i);
                //i++;

                if(i>=1) return;
            }
        }
    }

    public static void  main(String[] arg){

        Object lock = new Object();

        SynThread1 t1 = new SynThread1(lock);
        t1.setName("SynThread_1");
        SynThread1 t2 = new SynThread1(lock);
        t2.setName("SynThread_2");
        t2.start();
        t1.start();



        try {
            Thread.sleep(1000);

            synchronized(lock){
                lock.notify();    //é€šè¿‡¾l“æžœè§‚å¯ŸåQŒsun JVM(hotspot)çš„é€šçŸ¥æœºåˆ¶æžæœ‰å¯èƒ½æ˜¯FIFOçš„ç–ç•¥ï¼ŒåŽŸå› æ˜¯t1ã€t2åªè¦è°å…ˆå¯åŠ¨åQŒè°ž®±å°†è¢«å”¤é†’ã€?/span>
            }
        } catch (InterruptedException e) {
            // TODO Aut o-generated catch block            e.printStackTrace();
        }
    }
}

æ¡äšgå˜é‡½CÞZ¾‹åQ?br />
package com.zxl.thread.notify;

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

public class ConditionThread implements Runnable {

private ReentrantLock lock;

private Condition c;

private volatile int i=0;

public ConditionThread(ReentrantLock lock){
  this.lock = lock;
  c = lock.newCondition();
}

public void run() {

  lock.lock();

  try{

   while(true){
    if(i==0){
     System.out.println(Thread.currentThread().getName()+" will be waiting...");
     c.await();
    }

    System.out.println(Thread.currentThread().getName()+" is already waked up,i="+i);

    if(i>=1) return;
   }

  } catch (InterruptedException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  finally{
   lock.unlock();
  }



}

public Condition getCondition(){
  return c;
}

public static void main(String[] args){



  ReentrantLock lock = new ReentrantLock();
  ConditionThread ct1 = new ConditionThread(lock);
  ConditionThread ct2 = new ConditionThread(lock);
  Thread t1 = new Thread(ct1);
  t1.setName("C_Thread_1");
  Thread t2 = new Thread(ct2);
  t2.setName("C_Thread_2");

  t1.start();
  t2.start();

  try {
   Thread.sleep(1000);
  } catch (InterruptedException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

  lock.lock();
  ct1.getCondition().signal();   //å”¤é†’½W¬ä¸€ä¸ªçº¿½E?br />  lock.unlock();
}

}

zhangxl 2011-07-28 12:11 å‘è¡¨è¯„è®º
]]>

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ReentrantLockæºç ä¹‹äºŒunlockæ–ÒŽ³•è§£æž(é”çš„é‡Šæ”¾)

ReentrantLockæºç ä¹‹ä¸€lockæ–ÒŽ³•è§£æž(é”çš„èŽ·å–)

ReentrantLockæºç ä¹‹äºŒunlockæ–ÒŽ³•è§£æž(é”çš„é‡Šæ”¾)

ReentrantLockæºç ä¹‹ä¸€lockæ–ÒŽ³•è§£æž(é”çš„èŽ·å–)