C#中Mutex对象用法分析

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MyMutexgM1 = 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}}}