[GitHub] [tomcat] y987425112 commented on issue #145: Adding volatile keywords to member variables

[GitBox <gi...@apache.org>]

y987425112 commented on issue #145: Adding volatile keywords to member variables
URL: https://github.com/apache/tomcat/pull/145#issuecomment-470488340
 
 
   `package com.ydy.thread.volatile2;
   
   public class VolatileTest {
   	public static void main(String[] args) throws Exception {
   		Task task=new Task();
   		task.start();
   		Thread.sleep(2000);
   		
   		task.setFlag(false);
   		System.out.println("task.setFlag(true)");
   		
   	}
   	
   
   	private static class Task extends Thread{
   		private    boolean  flag=true;
   		private int num=0;
   
   		@Override
   		public void run() {
   			// TODO Auto-generated method stub
   			while(getFlag()) {
   				num	++;
   			}
   			
   		}
   		
   		private  boolean getFlag() {
   		    return flag;
   		}
   
   		public synchronized void setFlag(boolean flag) {
   			this.flag = flag;
   		}
   		
   		
   	}
   }`
   Dead cycle

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