ManualResetEvent用法

ManualResetEvent 允许线程通过发信号互相通信。通常,此通信涉及一个线程在其他线程进行之前必须完成的任务。

public static ManualResetEvent mre = new ManualResetEvent(false);
ManualResetEvent建立时是把false作为start的初始状态,这个类用于通知另一个线程,让它等待一个或多个线程。注意,为了通知或监听同一个线程,所有的其它线程都能访问那个类。
等待线程这样写:
  mre.WaitOne();
这将引起等待线程无限期的阻塞并等待类来通知。
发信号的线程应该这样:
  mre.Set();
这样类就会被通知,值变成true,等待线程就会停止等待。在通知事件发生后,我们就可以使用下面语句把线程置于非终止状态,导致线程阻止:
  mre.Reset();
一个测试的例子:

using System;
using System.Threading;
namespace ThreadingTester
{
    
class ThreadClass
    
{
        
public static ManualResetEvent mre = new ManualResetEvent(false);
        
public static void trmain()
        
{
            Thread tr 
= Thread.CurrentThread;
            Console.WriteLine(
"thread: waiting for an event");
            mre.WaitOne();
            Console.WriteLine(
"thread: got an event");
            
for (int x = 0; x < 10; x++)
            
{
                Thread.Sleep(
1000);
                mre.WaitOne();
                Console.WriteLine(tr.Name 
+ "" + x);
            }

        }

        
static void Main(string[] args)
        
{
            Thread thrd1 
= new Thread(new ThreadStart(trmain));
            thrd1.Name 
= "thread1";
            thrd1.Start();
            
for (int x = 0; x < 10; x++)
            
{
                Thread.Sleep(
900);
                Console.WriteLine(
"Main:" + x);
                
if (5 == x) mre.Set();
                
if (6 == x) mre.Reset();
                
if (8 == x) mre.Set();
            }

            
while (thrd1.IsAlive)
            
{
                Thread.Sleep(
1000);
                Console.WriteLine(
"Main: waiting for thread to stop");
            }

        }

    }

}

运行的结果为:
thread: waiting for an event
Main:0
Main:1
Main:2
Main:3
Main:4
Main:5
thread: got an event
Main:6
Main:7
Main:8
thread1: 0
Main:9
thread1: 1
Main: waiting for thread to stop
thread1: 2
Main: waiting for thread to stop
thread1: 3
Main: waiting for thread to stop
thread1: 4
Main: waiting for thread to stop
thread1: 5
Main: waiting for thread to stop
thread1: 6
Main: waiting for thread to stop
thread1: 7
Main: waiting for thread to stop
thread1: 8
Main: waiting for thread to stop
thread1: 9
Main: waiting for thread to stop
posted @ 2008-06-24 16:01  王庆  阅读(2286)  评论(2编辑  收藏  举报