C#多线程学习之(六)互斥对象用法实例

using System;
using System.Threading;
namespace ThreadExample
{
 public class MutexSample
 {
 static Mutex gM1;
 static Mutex gM2;
 const int ITERS = 100;
 static AutoResetEvent Event1 = new AutoResetEvent(false);
 static AutoResetEvent Event2 = new AutoResetEvent(false);
 static AutoResetEvent Event3 = new AutoResetEvent(false);
 static AutoResetEvent Event4 = new AutoResetEvent(false);
 public static void Main(String[] args)
 {
 Console.WriteLine("Mutex Sample ");
 //创建一个Mutex对象，并且命名为MyMutex
 gM1 = new Mutex(true,"MyMutex");
 //创建一个未命名的Mutex 对象.
 gM2 = new Mutex(true);
 Console.WriteLine(" - Main Owns gM1 and gM2");
 AutoResetEvent[] evs = new AutoResetEvent[4];
 evs[0] = Event1; //为后面的线程t1,t2,t3,t4定义AutoResetEvent对象
 evs[1] = Event2; 
 evs[2] = Event3; 
 evs[3] = Event4; 
 MutexSample tm = new MutexSample( );
 Thread t1 = new Thread(new ThreadStart(tm.t1Start));
 Thread t2 = new Thread(new ThreadStart(tm.t2Start));
 Thread t3 = new Thread(new ThreadStart(tm.t3Start));
 Thread t4 = new Thread(new ThreadStart(tm.t4Start));
 t1.Start( );
 //使用Mutex.WaitAll()方法等待一个Mutex数组中的对象全部被释放
 t2.Start( );
 //使用Mutex.WaitOne()方法等待gM1的释放
 t3.Start( );
 //使用Mutex.WaitAny()方法等待一个Mutex数组中任意一个对象被释放
 t4.Start( );
 //使用Mutex.WaitOne()方法等待gM2的释放
 Thread.Sleep(2000);
 Console.WriteLine(" - Main releases gM1");
 gM1.ReleaseMutex( );
 //线程t2,t3结束条件满足
 Thread.Sleep(1000);
 Console.WriteLine(" - Main releases gM2");
 gM2.ReleaseMutex( );
 //线程t1,t4结束条件满足
 //等待所有四个线程结束
 WaitHandle.WaitAll(evs); 
 Console.WriteLine(" Mutex Sample");
 Console.ReadLine();
 }
 public void t1Start( )
 {
 Console.WriteLine("t1Start started, Mutex.WaitAll(Mutex[])");
 Mutex[] gMs = new Mutex[2];
 gMs[0] = gM1;
 //创建一个Mutex数组作为Mutex.WaitAll()方法的参数
 gMs[1] = gM2;
 Mutex.WaitAll(gMs);
 //等待gM1和gM2都被释放
 Thread.Sleep(2000);
 Console.WriteLine("t1Start finished,Mutex.WaitAll(Mutex[]) satisfied");
 Event1.Set( );
 //线程结束，将Event1设置为有信号状态
 }
 public void t2Start( )
 {
 Console.WriteLine("t2Start started, gM1.WaitOne( )");
 gM1.WaitOne( );//等待gM1的释放
 Console.WriteLine("t2Start finished, gM1.WaitOne( ) satisfied");
 Event2.Set( );//线程结束，将Event2设置为有信号状态
 }
 public void t3Start( )
 {
 Console.WriteLine("t3Start started, Mutex.WaitAny(Mutex[])");
 Mutex[] gMs = new Mutex[2];
 gMs[0] = gM1;//创建一个Mutex数组作为Mutex.WaitAny()方法的参数
 gMs[1] = gM2;
 Mutex.WaitAny(gMs);//等待数组中任意一个Mutex对象被释放
 Console.WriteLine("t3Start finished, Mutex.WaitAny(Mutex[])");
 Event3.Set( );//线程结束，将Event3设置为有信号状态
 }
 public void t4Start( )
 {
 Console.WriteLine("t4Start started, gM2.WaitOne( )");
 gM2.WaitOne( );//等待gM2被释放
 Console.WriteLine("t4Start finished, gM2.WaitOne( )");
 Event4.Set( );//线程结束，将Event4设置为有信号状态
 }
 }
}

Mutex Sample 
 - Main Owns gM1 and gM2
t1Start started, Mutex.WaitAll(Mutex[])
t2Start started, gM1.WaitOne( )
t3Start started, Mutex.WaitAny(Mutex[])
t4Start started, gM2.WaitOne( )
 - Main releases gM1
t2Start finished, gM1.WaitOne( ) satisfied
t3Start finished, Mutex.WaitAny(Mutex[])
 - Main releases gM2
t1Start finished, Mutex.WaitAll(Mutex[]) satisfied
t4Start finished, gM2.WaitOne( )
 Mutex Sample