我正在做一个并发问题作业。我有许多线程在做特定的事情,还有一个方法决定这些线程何时可以访问资源。

所以我的课看起来像这样:

public class Boss extends ReentrantLock implements Runnable {

    Lock access = new ReentrantLock();
    Condition canTakeOff = access.newCondition();
    Condition canLand = access.newCondition();

    public void accessToLanding(){
            access.lock();
            try{
                if(getWaitQueueLength(canTakeOff) > 0){
                    canTakeOff.notifyAll();
                } else if {
                 /* some other cases */
                }
            } catch (InterruptedException e){
                e.printStackTrace();
            } finally {
                access.unlock();
            }
    }

    public void run(){
        accessToLanding();
    }

    /* Methods which are called by objects of a different class,
    they are awaiting for the signal from accessToLanding.*/
}


我收到错误消息:

Exception in thread "Thread-0" java.lang.IllegalArgumentException: Not owner
at java.util.concurrent.locks.AbstractQueuedSynchronizer.getWaitQueueLength(AbstractQueuedSynchronizer.java:1789)
at java.util.concurrent.locks.ReentrantLock.getWaitQueueLength(ReentrantLock.java:720)


我检查了文档,并说当“给定条件与该锁没有关联”时,getWaitQueueLength引发IllegalArgumentException,但据我了解,它与我的代码关联。
有人能帮我吗?

最佳答案

调用时

getWaitQueueLength(canTakeOff)


你在打电话

this.getWaitQueueLength(canTakeOff)


这是您的老板实例。尽管canTakeOff已被声明具有成员,但它不属于Boss,它是从访问获得的条件

我认为您必须稍微更改上述内容并使用

access.getWaitQueueLength(canTakeOff)


更多信息:Javadoc getWaitQueueLength throws IllegalArgumentException

关于java - getWaitQueueLength引发IllegalArgumentException:不是所有者,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/36118178/

10-12 14:24