如何在java中停止生产者和消费者问题中的线程？ [英] how can I stop a thread in producer and consumer problem in java?

问题描述

这是我的消费者类

我不知道在产品生产之前我怎么能停止一个线程？

（睡眠似乎不起作用）

请建议我除阻塞队列界面和睡眠方法以外的其他方式

this is my consumer class
I cant know how can I stop a thread until a product will be produced?
(the sleep seems not work sometimes)
please suggest me a way other than the blocking queue interface and sleep method

package producerconsumer;

import java.util.Scanner;

public class Consumer implements Runnable {
    Thread t;
    String consumerName;

    public Consumer(String name) {
        t = new Thread(this, name);
        t.start();
        
    }
    @Override
    public  void run() {
        int m = Producer_consumer.n;
        try {
            if (m!=0) {           
                 Producer_consumer.delay.acquire();
            }
            else
            {
                Thread.sleep(100); //??   
            }
            
            while (true) {
                Producer_consumer.criticalSection.acquire();
                consumerName = Thread.currentThread().getName();
                consume();
                Producer_consumer.n--;
                Producer_consumer.form.setLable(Producer_consumer.n + "");
                m = Producer_consumer.n;
                Producer_consumer.criticalSection.release();

            }

        } catch (InterruptedException ex) {
            ex.printStackTrace();
        }

    }

    }

推荐答案

看起来像你的问题是通过一些其他线程的主动异步停止一个线程（只有这种情况通常会导致困难）。

整个事情是一个有争议的话题，我不想在这里讨论。我说几句，我不喜欢它是如何在Java中完成的。大多数人通过使用某个成员（布尔标志）以协作方式停止线程，该成员可以通过线程轮询来停止并由单独的线程设置。此外， Thread.interrupt 可以使用，但有一些buts。本文对此进行了详细介绍： http://www.javamex.com/tutorials/threads/stopping_thread.shtml [ ^ ]。



请注意，关于生产者 - 消费者模式以及阻塞队列的使用，提到了排队条件的技术。

-SA

It looks like your problem is stopping a thread asynchronously, by the initiative of some other thread (only this situation usually causes difficulties).
The whole thing is a controversial topic I don't want to discuss here. I a few words, I dislike how it's done in Java. Most people stop thread in a collaborative way, by using some member (Boolean "flag") which can polled by a thread to be stopped and set by a separate thread. Also, Thread.interrupt can be used, with, but with certain "buts". This is pretty well described in this article: http://www.javamex.com/tutorials/threads/stopping_thread.shtml[^].

Note that the technique of "queued condition" is mentioned in relation to the producer-consumer patters and the use of blocking queue.

—SA

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