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

[GitBox]

y987425112 commented on issue #145: Adding volatile keywords to member variables
URL: https://github.com/apache/tomcat/pull/145#issuecomment-470489493
 
 
   ```
   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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