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POProducer Consumer thread management in java
 

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  1. POProducer Consumer thread management in java
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    <p>I am implementing basic producer consumer problem in java but my code is getting hanged and consumer is not consuming when producer fills the buffer. below is the code</p> <pre><code>import java.util.Vector; class hi{ static int i; } class Producer implements Runnable { volatile Vector&lt;Integer&gt;queue; Producer(Vector&lt;Integer&gt; q) { queue=q; } public void run() { while(true) { try{ produce(); } catch(Exception e) { } } } public synchronized void produce() throws InterruptedException { while(queue.size()==5) { synchronized(queue) { queue.wait(); } } int t=hi.i++; Thread.sleep(2000); System.out.println("adding "+t); queue.add(t); queue.notify(); } } class Consumer implements Runnable { volatile Vector&lt;Integer&gt;queue; Consumer(Vector&lt;Integer&gt; q) { queue=q; } public void run() { while(true) { System.out.println("kaka"); try{ consume(); } catch(Exception e) { } } } public synchronized void consume() throws InterruptedException { //Thread.sleep(2000); while(queue.size()==0) { synchronized(queue) { queue.wait(); } } System.out.println("Removing "+queue.get(0)); queue.remove(0); queue.notify(); } } public class ProducerConsumer { public static void main(String [] args) throws InterruptedException { Vector&lt;Integer&gt;q=new Vector&lt;Integer&gt;(); Producer p=new Producer(q); Thread p1=new Thread(p); Consumer c=new Consumer(q); Thread c1=new Thread(c); p1.start(); Thread.sleep(2000); System.out.println("kailash"); c1.start(); } } </code></pre> <p>Above I commented Thread.sleep(2000) in consume method.If I uncomment this the code works perfectly fine.Kindly help me in understanding the issue.</p>
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    1. USGaurav Kaushik
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      1. UScosmolev
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    1. COYou should synchronize on `queue` before calling `queue.notify()`...
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      1. POProducer Consumer thread management in java
      1. USassylias
    2. COThank You Now its working :-)
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      1. POProducer Consumer thread management in java
      1. USGaurav Kaushik
    3. COAre you doing this to learn about it or for a "real" use? If it's the latter, you should look into the classes in the java.util.concurrent package.
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      1. USBill
 

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