Java中如何使一个线程进入阻塞态?

按我的理解,当一个线程需要获取的锁被另一个线程占用时,将进入阻塞态。但实际好像不是这样的,下面是我的代码。

在run方法中会调用MyBlock的isBlocked方法,该方法添加了synchronized限定。

在main方法中创建两个线程:t1和t2,t1运行后,由于isBlocked方法运行需要一定时间,t2应该进入阻塞态。但我调用getState方法得到的是Runnable,不是Blocked

这是为啥呢?

 

public class TestThread implements Runnable {
    private String mThreadName = null;
    private MyLock mLock = null;
    
    public TestThread(String name, MyLock l){
        mThreadName = name;
        mLock = l;
    }
    
    @Override
    public void run() {
        // TODO Auto-generated method stub
        subTask();
    }
    
    private void subTask()
    {
        System.out.println(mThreadName + "START!");
        mLock.isLocked();
        System.out.println(mThreadName + "END!");
    }
    
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        MyLock lock = new MyLock();
        
        TestThread r1 = new TestThread("A", lock);
        Thread t1 = new Thread(r1);
        t1.start();
        
        TestThread r2 = new TestThread("B", lock);
        Thread t2 = new Thread(r2);
        t2.start();
        System.out.println(t2.getState());
        //t2.interrupt();
        System.out.println(t2.getState());
        
        System.out.println("MAIN END!");

    }
    
    public static class MyLock{
        private ReentrantLock mLock = new ReentrantLock();
    
        public synchronized void isLocked(){
            System.out.println("@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
            for (int i = 0; i < 10000; i ++){
                System.out.print("," + i);
            }
            System.out.println("#############################");
        }
    }

}

 

5个回答

1.[quote]在我这个程序中,synchronized的效果应该与lock是一样的[/quote]
基本是一样的。前者是自动,后者是手动加锁。效果从并发控制的锁的角度都是一样的。

2.[quote]在我这个程序中,synchronized的效果应该与lock是一样的。你指的程序运行不确定性,是否指在调用getState时,t2还可能没有进入blocked状态?
[/quote]

正确。

从我的运行结果是可以看出阻塞(blocked)的。

[code="java"]ASTART!
BSTART!
@@@@@@@@@@@@@@@@@@@@@@@@@@@@
,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32RUNNABLE
,33BLOCKED
,34MAIN END!
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AEND!
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,3222,3223,3224,3225,3226,3227,3228,3229,3230,3231,3232,3233,3234,3235,3236,3237,3238,3239,3240,3241,3242,3243,3244,3245,3246,3247,3248,3249,3250,3251,3252,3253,3254,3255,3256,3257,3258,3259,3260,3261,3262,3263,3264,3265,3266,3267,3268,3269,3270,3271,3272,3273,3274,3275,3276,3277,3278,3279,3280,3281,3282,3283,3284,3285,3286,3287,3288,3289,3290,3291,3292,3293,3294,3295,3296,3297,3298,3299,3300,3301,3302,3303,3304,3305,3306,3307,3308,3309,3310,3311,3312,3313,3314,3315,3316,3317,3318,3319,3320,3321,3322,3323,3324,3325,3326,3327,3328,3329,3330,3331,3332,3333,3334,3335,3336,3337,3338,3339,3340,3341,3342,3343,3344,3345,3346,3347,3348,3349,3350,3351,3352,3353,3354,3355,3356,3357,3358,3359,3360,3361,3362,3363,3364,3365,3366,3367,3368,3369,3370,3371,3372,3373,3374,3375,3376,3377,3378,3379,3380,3381,3382,3383,3384,3385,3386,3387,3388,3389,3390,3391,3392,3393,3394,3395,3396,3397,3398,3399,3400,3401,3402,3403,3404,3405,3406,3407,3408,3409,3410,3411,3412,3413,3414,3415,3416,3417,3418,3419,3420,3421,3422,3423,3424,3425,3426,3427,3428,3429,3430,3431,3432,3433,3434,3435,3436,3437,3438,3439,3440,3441,3442,3443,3444,3445,3446,3447,3448,3449,3450,3451,3452,3453,3454,3455,3456,3457,3458,3459,3460,3461,3462,3463,3464,3465,3466,3467,3468,3469,3470,3471,3472,3473,3474,3475,3476,3477,3478,3479,3480,3481,3482,3483,3484,3485,3486,3487,3488,3489,3490,3491,3492,3493,3494,3495,3496,3497,3498,3499,3500,3501,3502,3503,3504,3505,3506,3507,3508,3509,3510,3511,3512,3513,3514,3515,3516,3517,3518,

线程运行的不确定性 导致你不一定能看到 锁现象,阻塞现象。

[code="java"] private ReentrantLock mLock = new ReentrantLock();

[/code]

还可以用mLock通过trylock和lock去在临界区枷锁测试。

[code="java"]package iteye;

public class TestThread implements Runnable {
private final String mThreadName;
private final MyLock mLock;

public TestThread(String name, MyLock l) {
    mThreadName = name;
    mLock = l;
}

public void run() {
    System.out.println(mThreadName + " START!");
    mLock.lock();
    System.out.println(mThreadName + " END!");
}

/**
 * @param args
 */
public static void main(String[] args) {
    MyLock lock = new MyLock();

    TestThread r1 = new TestThread("A", lock);
    Thread t1 = new Thread(r1);
    t1.start();
    // 确保t1先进入run方法
    try {
        Thread.sleep(1000);
    } catch (InterruptedException e) {
    }

    TestThread r2 = new TestThread("B", lock);
    Thread t2 = new Thread(r2);
    t2.start();
    // 确保t2进入run方法
    try {
        Thread.sleep(1000);
    } catch (InterruptedException e) {
    }
    // 只有t1正在执行lock方法中,而t2也进入run方法等待执行lock方法时,t2的状态才是BLOCKED
    System.out.println(t2.getState());
    System.out.println("MAIN END!");

}

public static class MyLock {

    public synchronized void lock() {
        try {
            Thread.sleep(7000);//模拟线程的执行时间比较长
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

}
[/code]

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1.java调用sqlplus将数据库信息写入本地sql文件(我用的是spool命令将数据库download到本地) 2.在java环境中使用这个本地sql文件, 即上述2个步骤在一个main函数中完成。 我在实际操作中,第二步操作报的错是找不到这个本地sql文件,我猜想可能是第一步没完成的时候,第二步已经开始执行,所以我想用多线程并发。 我将上面2个步骤用2个进程thread1,thread2,因为步骤2必须等步骤1结束才能执行,所以我调用thread1.start(),thread1.join(),以及thread2.start() 但实际情况是线程1阻塞了,有人说我没用清除sqlplus缓存,求解该如何解决,谢谢!!!
请教使用java多线程理解的问题
我觉得面向业务的多线程解决问题的两种思路,一个完整的A业务。1.拆分为多个部分由不同线程协作完成。 2.多个线程多次完成A业务,线程间没有协作。 对于第一种可以用阻塞唤醒,阻塞队列完成。 那第二种难道是多次启动线程就行了吗?,那跟每次新new一个A业务对象有什么区别? 还有什么时候使用多线程最好,举个例子 恳请指点,谢谢谢谢。。
Java swing多线程实现聊天程序阻塞问题
1、在用swing写一个能够动态添加客户端的socket通信程序,即服务端用 一个异步线程持续监听新的客户端连接,如果有新的连接就新建一个客户端线 程来监听客户端,接收或者发送给客户端信息。 ```java //这是监听客户端连接的线程: new Thread(new Runnable() { @Override public void run() { // 异步线程持续监听端口连接 while (true){ if (server.isClosed()){ // 服务器一旦关闭,就跳出循环 break; } Socket temp = null; try { temp = server.accept(); JOptionPane.showMessageDialog(null,"连接建立成功,客户端端口号为:" +temp.getPort()); // 为每一个连接建立一个异步线程 Connection con = new Connection(temp); con.start(); connections.add(con); sockets.add(temp); } catch (IOException ex) { ex.printStackTrace(); } } } }).start(); ``` 这是客户端线程类: ```java class Connection extends Thread{ Socket socket; BufferedReader reader; PrintWriter writer; public Connection(Socket socket){ this.socket = socket; } @Override public void run() { System.out.println("来了!"); try { reader = new BufferedReader(new InputStreamReader(socket.getInputStream())); writer = new PrintWriter(socket.getOutputStream()); // 第一次连接,先写出已经存在的联系人 writer.println("还没有联系人"); // 再读取新建联系人的名字 String clientName = reader.readLine(); System.out.println("客户端名字:" +clientName); reader.close(); } catch (IOException e) { e.printStackTrace(); } /* while (true){ try { if (socket.isConnected() == false){ break; } } catch (Exception e) { e.printStackTrace(); } }*/ } } ``` 这是客户端启动时执行的方法: ```java @Override public void windowOpened(WindowEvent e) { // 窗口打开就建立连接 try { socket = new Socket("localhost",3030); reader = new BufferedReader(new InputStreamReader(socket.getInputStream())); writer = new PrintWriter(socket.getOutputStream()); } catch (IOException ex) { JOptionPane.showMessageDialog(null,"服务器未开启,不能连接,请关闭此客户端!"); } /* 连接一旦建立需要立刻执行的事情 * 1、向服务器发送该客户端的名字 * 2、获取其他已经存在的客户端名字 * */ try { System.out.println(reader.readLine()); writer.println(clientName); } catch (IOException ex) { ex.printStackTrace(); } } ``` 每次一到这个windowOpen方法的System.out.println(reader.readLine());这里就卡死,没有报错,直接卡住。 看了网上说什么readline()会因为没读到数据阻塞,所以猜想是服务端发送数据时一直没有发出来,不过没有找到解决办法,这是卡住时的情况截图 ![图片说明](https://img-ask.csdn.net/upload/201911/08/1573184051_750205.png)
Thread.sleep(long time)线程堵塞
我在系统中开启了很多的匿名线程模拟任务执行过程,run方法内用到了Thread.sleep(long time) time一般为200~300ms,和其他一些判断逻辑(其他判断逻辑没有问题),系统一定概率可以完整运行 ![图片说明](https://img-ask.csdn.net/upload/201510/17/1445079487_603970.png) 如图中的UnitPcFunction和UnitRobotFunction 线程理想状态为 休眠200~300ms后消亡,但这些线程一定概率会被执行貌似挂起的操作,在睡眠到设定的时间点后,仍显示正在执行,而不消亡,且JVM内存资源足够,这到底问什么,百思不得解啊
java web 开发涉及到多线程了么?
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请问JAVA中native方法对线程和JNI的解析和在CodeCache的保存有何影响和不同?
多线程状态下 当前线程调用到 native 方法时,对于 JVM 来说,是对其他线程进行 阻塞,等待当前线程执行完 native 方法,还是在执行 native 方法过程中,任然可以进行多线程的切换执行?(目前没有环境,无法测试) 那么当调用到 native(如:C++) 方法时,会被 JNI 在 Code Cache 解析为一条指令,还是继续解析 native 方法得到相应指令?如果是继续解析 native 方法 ,那么解析后的机器码,在 Code Cache 中的保存和 将 JAVA 代码解析后的机器码保存有什么不同? 谢谢。
初学java,对线程安全及并发这块不了解,有些问题需要请教
在看到关于synchronized用法的一个例子时,有些疑惑 ``` package com.company; public class TicketDB { // 机票的数量 private int ticketCount = 1; // 获得当前机票数量 public int getTicketCount() { return ticketCount; } // 销售机票 public void sellTicket() { try { // 等于用户付款 // 线程休眠,阻塞当前线程,模拟等待用户付款 Thread.sleep(1000); } catch (InterruptedException e) { } System.out.printf("第%d号票,已经售出\n", ticketCount); ticketCount--; } } package com.company; public class HelloWorld { public static void main(String[] args) { TicketDB db=new TicketDB(); Thread t1 = new Thread(() -> { while (true) { int currTicketCount = db.getTicketCount(); // 查询是否有票 if (currTicketCount > 0) { db.sellTicket(); } else { // 无票退出 break; } } }); // 开始线程t1 t1.start(); // 创建线程t2 Thread t2 = new Thread(() -> { while (true) { int currTicketCount = db.getTicketCount(); // 查询是否有票 if (currTicketCount > 0) { db.sellTicket(); } else { // 无票退出 break; } } }); // 开始线程t2 t2.start(); } } 输出结果如下: 第1号票,已经售出 第1号票,已经售出 这个结果我能有所理解,但后续该书中说到:将类TicketDB中的getTicketCount和sellTicket方法前加入synchronized关键字,可以防止这种重复卖票的现象。将类TicketDB进行修改,如下: package com.company; public class TicketDB { // 机票的数量 private int ticketCount = 1; // 获得当前机票数量 public synchronized int getTicketCount() { return ticketCount; } // 销售机票 public synchronized void sellTicket() { try { // 等于用户付款 // 线程休眠,阻塞当前线程,模拟等待用户付款 Thread.sleep(1000); } catch (InterruptedException e) { } System.out.printf("第%d号票,已经售出\n", ticketCount); ticketCount--; } } 结果确实有变: 第1号票,已经售出 Q1:为何会这样?有没有可能这样,第一个线程执行完int currTicketCount = db. tTicketCount() ;此时该线程对应的工作内存中的currTicketCount值为1,然后改线程退出运行状态进入就绪状态,此时第二个线程得到CPU资源进入运行状态,也执行intcurrTicketCount=db.tTicketCount(),那此时由于线程1未执行sellTicket,那么线程2中的currTicketCount值也为1,那么假设此时线程1又进入running状态,当它售完票后,票数为0,但由于线程2的currTicketCount为1,满足大于0的条件,那么线程2也会进行sellTicket操作,那么是否会出现第0张票已经售出的奇怪现象 Q2:运行时,电脑是多核的,用jvisualvm看线程,发现这两个线程始终在时间上是错开的,无法并行运算,为什么?多核的也无法让多线程程序并行吗?
Java中的ReentrantLock的lock()方法是否能让线程进入BLOCKING状态
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java线程问题
除了我们编码时显式中断外,什么情况下阻塞线程会被中断,想详细学习下java中多线程和进程模型该看哪本书? [b]问题补充:[/b] 我是想问已经被阻塞的线程,什么情况下还会被中断(编码显式置中断位除外),阻塞和中断概念应该不同吧 [b]问题补充:[/b] lggege 说的sleep时间到,join时间到,互斥结束,应该是被唤醒吧?
Java 生产者消费者与线程池
假设有1000个任务需要处理,第一种方法:将这1000任务加到阻塞队列中,用一个分发线程去将这些任务分发到下面10个子队列中,然后每个子队列有一个线程去消费这些任务。第二种方法:直接新建个线程池,每一个任务都new 一个线程去处理,再把这新建的线程放到线程池中,依靠线程池的机制去等待排队。这两种得到的效果是不是一样的,比如花费的时间,内存之类的,总感觉第二种方式虽然鲁莽,但实际上确实简单可行,第一种方式感觉稍许复杂,但是最后达到的效果和第二种是一样的呀,请教一下这两种有什么优点和缺点。
Java中LockSupport.parkNanos与Sleep的区别是什么?
Java中LockSupport.parkNanos与Sleep都可以使当前线程阻塞指定时间,那么除了是否抛出interrupt异常以外,这两者的区别是什么呢?在JVM中两者对于CPU的调度有区别吗?在实际使用中,是推荐使用LockSupport.parkNanos还是Sleep呢?
Java多线程中断的问题
代码如下,为什么在中断之后将中断位清除后再进入阻塞,仍然会捕捉到中断异常? ``` public class InterruptDemo implements Runnable { public void run() { try { //中断当前线程 Thread.currentThread().interrupt(); boolean b = Thread.interrupted(); System.out.println(b); //true b = Thread.interrupted(); System.out.println(b); //false //进入阻塞 Thread.currentThread().wait(); } catch (InterruptedException e) { e.printStackTrace(); } } } ```
单核服务器的java线程只能while阻塞一个吗?
是一台单核服务器,java的服务器端有一个接收ajax的长连接,就使用了一个while来监听 是否有需要发送给客户端的数据。 只要一开始连接,服务器CPU占有率就是100%,在自己的机子上调试(4核),CPU占有率就是25%。 那问题就是,这样的话单核服务器岂不是不敢用阻塞while了吗? 不说万级的长连接,就连3,5个长连接可能就会导致服务器死掉。 这个是怎么处理呢?
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oracle/jdbc/driver/T4CSocketInputStreamWrapper.readNextPacket(T4CSocketInputStreamWrapper.java:124) at oracle/jdbc/driver/T4CSocketInputStreamWrapper.read(T4CSocketInputStreamWrapper.java:80) at oracle/jdbc/driver/T4CMAREngine.unmarshalUB1(T4CMAREngine.java:1137) at oracle/jdbc/driver/T4CTTIfun.receive(T4CTTIfun.java:290) at oracle/jdbc/driver/T4CTTIfun.doRPC(T4CTTIfun.java:192) at oracle/jdbc/driver/T4C8Oall.doOALL(T4C8Oall.java:531) at oracle/jdbc/driver/T4CPreparedStatement.doOall8(T4CPreparedStatement.java:207) at oracle/jdbc/driver/T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:1044) at oracle/jdbc/driver/OracleStatement.executeMaybeDescribe(OracleStatement.java:1199) at oracle/jdbc/driver/OracleStatement.doExecuteWithTimeout(OracleStatement.java:1289) at oracle/jdbc/driver/OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3593) at oracle/jdbc/driver/OraclePreparedStatement.execute(OraclePreparedStatement.java:3694) ^-- Holding lock: oracle/jdbc/driver/T4CConnection@0x9b7c8fd0[thin lock] at oracle/jdbc/driver/OraclePreparedStatementWrapper.execute(OraclePreparedStatementWrapper.java:1378) at weblogic/jdbc/wrapper/PreparedStatement.execute(PreparedStatement.java:99) at com/ibatis/sqlmap/engine/execution/SqlExecutor.executeQuery(SqlExecutor.java:186) at com/paic/pafa/app/lwc/service/persistence/dao/ibatis/PafaSqlExecutor.doSuperExecuteQuery(Lcom/ibatis/sqlmap/engine/scope/RequestScope;Ljava/sql/Connection;Ljava/lang/String;[Ljava/lang/Object;IILcom/ibatis/sqlmap/engine/mapping/statement/RowHandlerCallback;)V(Unknown Source) at com/paic/pafa/app/lwc/service/persistence/dao/ibatis/PafaSqlExecutor.executeQuery(Lcom/ibatis/sqlmap/engine/scope/RequestScope;Ljava/sql/Connection;Ljava/lang/String;[Ljava/lang/Object;IILcom/ibatis/sqlmap/engine/mapping/statement/RowHandlerCallback;)V(Unknown Source) at com/ibatis/sqlmap/engine/mapping/statement/GeneralStatement.sqlExecuteQuery(GeneralStatement.java:205) at com/ibatis/sqlmap/engine/mapping/statement/GeneralStatement.executeQueryWithCallback(GeneralStatement.java:173) at com/ibatis/sqlmap/engine/mapping/statement/GeneralStatement.executeQueryForObject(GeneralStatement.java:104) at com/ibatis/sqlmap/engine/impl/SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:566) at com/ibatis/sqlmap/engine/impl/SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:541) at com/ibatis/sqlmap/engine/impl/SqlMapSessionImpl.queryForObject(SqlMapSessionImpl.java:106) at org/springframework/orm/ibatis/SqlMapClientTemplate$1.doInSqlMapClient(SqlMapClientTemplate.java:270) at org/springframework/orm/ibatis/SqlMapClientTemplate.execute(SqlMapClientTemplate.java:200) at org/springframework/orm/ibatis/SqlMapClientTemplate.queryForObject(SqlMapClientTemplate.java:268) at com/paic/pa18shop/policy/biz/intergration/dao/impl/AppPolicyBaseInfoDAO.findOneApplyPolicy(AppPolicyBaseInfoDAO.java:96) at com/paic/pa18shop/policy/biz/service/impl/AppPolicyBaseInfoService.findOneApplyPolicy(AppPolicyBaseInfoService.java:893) at com/XXXXXXXXX/Pa18ShopServiceImpl.saveAppPolicy(Pa18ShopServiceImpl.java:228) at com/XXXXXXXXX/TempSaveActionImpl.saveToPa18Shop(TempSaveActionImpl.java:1126) at com/XXXXXXXXX/TempSaveActionImpl._baseInfoSave(TempSaveActionImpl.java:863) at com/XXXXXXXXX/TempSaveActionImpl.vehicleInfoSave(TempSaveActionImpl.java:448) at com/XXXXXXXXX/TempSaveActionImpl._newTempSave(TempSaveActionImpl.java:157) at com/XXXXXXXXX/TempSaveActionImpl.execute(TempSaveActionImpl.java:117) at sun/reflect/GeneratedMethodAccessor956449.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;(Unknown Source) at sun/reflect/DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java/lang/reflect/Method.invoke(Method.java:597) at com/paic/pa18shop/core/biz/action/BaseAction.invokeMethod(BaseAction.java:93) at com/paic/pa18shop/core/biz/action/BaseAction.perform(BaseAction.java:43) at com/paic/pafa/app/biz/ac/impl/ApplicationControllerBean.handleRequest(Lcom/paic/pafa/app/dto/ServiceRequest;)Lcom/paic/pafa/app/dto/ServiceResponse;(Unknown Source) at com/paic/pa18shop/core/biz/AppControllerBean.handleRequest(AppControllerBean.java:44) at com/paic/pa18shop/core/biz/pafaAC_txwvep_EOImpl.__WL_invoke(Ljava/lang/Object;[Ljava/lang/Object;I)Ljava/lang/Object;(Unknown Source) at weblogic/ejb/container/internal/SessionRemoteMethodInvoker.invoke(SessionRemoteMethodInvoker.java:40) at com/paic/pa18shop/core/biz/pafaAC_txwvep_EOImpl.handleRequest(Lcom/paic/pafa/app/dto/ServiceRequest;)Lcom/paic/pafa/app/dto/ServiceResponse;(Unknown Source) at
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