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使用布尔值进行同步(Using boolean to synchronize)

 以下代码是否对List的并发访问是线程安全的？ 
 volatile是否符合条件在这里添加任何值？  
   class concurrentList{

        private AtomicBoolean locked = new AtomicBoolean(true);
        volatile List<Integer> list=new LinkedList<Integer>();
        long start = System.currentTimeMillis();
        long end = start + 60*100;


        public void push(int e){
            while(!locked.get());
            list.add(e);
            while(!locked.compareAndSet(true,false));
        }

        public int pop(){
            int elem;
            while(locked.get());
            elem=(Integer)list.remove(0);
            while(!locked.compareAndSet(false,true));
            return elem;
        }
....
}

Is the following code thread-safe on concurrent access to List?
 Does the volatile qualifies add any value here?  
   class concurrentList{

        private AtomicBoolean locked = new AtomicBoolean(true);
        volatile List<Integer> list=new LinkedList<Integer>();
        long start = System.currentTimeMillis();
        long end = start + 60*100;


        public void push(int e){
            while(!locked.get());
            list.add(e);
            while(!locked.compareAndSet(true,false));
        }

        public int pop(){
            int elem;
            while(locked.get());
            elem=(Integer)list.remove(0);
            while(!locked.compareAndSet(false,true));
            return elem;
        }
....
}

原文：https://stackoverflow.com/questions/44341104

更新时间：2023-02-20 07:02

最满意答案

 PowerShell cmdlet没有本机方法来执行此操作。 如果需要证书信息，您可能需要下载到.Net库。  
 执行此操作的一种方法是使用System.Net.ServicePointManager类。 具体来说，是FindServicePoint方法。  
 这必须作为Invoke-WebRequest的单独操作完成。 有关方法和返回值的详细信息，请参阅MSDN文档，有关您可以执行的操作的更多详细信息，但以下内容将为您提供您特别提到的数据。 有一点需要注意：我注意到，当我在实际调用Invoke-WebRequest或Invoke-RestMethod之前尝试调用FindServicePoint时，服务点上的Certificate属性为null。  
$StackExAPIResponse = Invoke-WebRequest https://api.stackexchange.com/users/104624?site=serverfault -TimeoutSec 3 -ErrorAction Stop
$servicePoint = [System.Net.ServicePointManager]::FindServicePoint("https://api.stackexchange.com")
$servicePoint.Certificate.GetCertHashString()
$servicePoint.Certificate.GetExpirationDateString()

The PowerShell cmdlets don't have a native way to do this. You will probably have to drop down to the .Net libraries if you want certificate information. 
One way of doing this will involve using the System.Net.ServicePointManager class. In specific, the FindServicePoint method. 
This will have to be done as a separate operation from the Invoke-WebRequest. See the MSDN documenation for the method and the return value for more details about what you can do, but the following would give you the data you specifically mentioned. One thing to note: I noticed that when I tried calling FindServicePoint prior to actually calling Invoke-WebRequest or Invoke-RestMethod, the Certificate property on the service point was null. 
$StackExAPIResponse = Invoke-WebRequest https://api.stackexchange.com/users/104624?site=serverfault -TimeoutSec 3 -ErrorAction Stop
$servicePoint = [System.Net.ServicePointManager]::FindServicePoint("https://api.stackexchange.com")
$servicePoint.Certificate.GetCertHashString()
$servicePoint.Certificate.GetExpirationDateString()

使用布尔值进行同步(Using boolean to synchronize)

最满意答案

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