.NET 线程同步(2)

    Monitor类的TryEnter()方法非常类似于Enter()方法,他试图获得对象的独占锁,不过它不会象Enter()方法那样暂停. 如果线程成功进入,则TryEnter()方法返回True.
   TryEnter()有3种重载方法,其中两个都带有超时参数,表示等待锁定的时间.

using System;
using System.Threading;

namespace MonitorTryEnter
{
 public class TryEnter
 {
  public TryEnter()
  {
  }

  public void CriticalSection()
  {
   bool b=Monitor.TryEnter(this,1000);
   Console.WriteLine("Thread "+Thread.CurrentThread.GetHashCode()+" TryEnter Value "+b);
   for(int i=1;i<=3;i++)
   {
    Thread.Sleep(1000);
    Console.WriteLine(i+" "+Thread.CurrentThread.GetHashCode()+" ");
   }
   Monitor.Exit(this);
  }

  public static void Main()
  {
   TryEnter a=new TryEnter();
   Thread t1=new Thread(new ThreadStart(a.CriticalSection));
   Thread t2=new Thread(new ThreadStart(a.CriticalSection));
   t1.Start();
   t2.Start();
  }
 }
}
运行结果:

在可能发生竞争,但不希望线程睡眠某个未指定的时间时,就可以使用TryEnter().

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