一段比较经典的多线程学习代码。 1、用到了多线程的同步问题。2、用到了多线程的顺序问题。 如果有兴趣的请仔细阅读下面的代码。注意其中代码段的顺序，思考一下，这些代码的顺序能否互相调换，为什么？这应该对学习很有帮助的。为了演示，让所有的线程都Sleep了一段时间。 using System.Net;using System;using System.IO;using System.Text;using System.Threading;using System.Diagnostics; namespace Webb.Study{    class TestThread    {        static Mutex m_Mutex            = new Mutex();        static Thread[] m_testThreads    = new Thread[10];        static int m_threadIndex        = 0;         static void ThreadCallBack()        {            TestThread.m_Mutex.WaitOne();            int m_index    = m_threadIndex;            TestThread.m_Mutex.ReleaseMutex();            Console.WriteLine("Thread {0} start.",m_index);            for(int i=0;i<=10;i++)            {                 TestThread.m_Mutex.WaitOne();                     Console.WriteLine("Thread {0}: is running. {1}",m_index,i);                TestThread.m_Mutex.ReleaseMutex();                Thread.Sleep(100);            }            Console.WriteLine("Thread {0} end.",m_index);        }         public static void Main(String[] args)        {            Console.WriteLine("Main thread start.");            for(int i=0;i<TestThread.m_testThreads.Length;i++)            {                TestThread.m_threadIndex    = i;                TestThread.m_testThreads[i]    = new Thread(new ThreadStart(ThreadCallBack));                                TestThread.m_testThreads[i].Start();                Thread.Sleep(100);            }            for(int i=0;i<TestThread.m_testThreads.Length;i++)            {                TestThread.m_testThreads[i].Join();            }            Console.WriteLine("Main thread exit.");        }    }}1、主函数中这两句能否互换？为什么？                TestThread.m_testThreads[i].Start();                Thread.Sleep(100); 2、CallBack函数中这两句能否互换？为什么？会有什么不同的结果？                TestThread.m_Mutex.ReleaseMutex();                Thread.Sleep(100); 3、主函数能否写成这样？为什么？会有什么不同的结果？        public static void Main(String[] args)        {            Console.WriteLine("Main thread start.");            for(int i=0;i<TestThread.m_testThreads.Length;i++)            {                TestThread.m_threadIndex    = i;                TestThread.m_testThreads[i]    = new Thread(new ThreadStart(ThreadCallBack));                                TestThread.m_testThreads[i].Start();                TestThread.m_testThreads[i].Join();                Thread.Sleep(100);            }            Console.WriteLine("Main thread exit.");        }4、这几句的作用是什么？那么程序中还存在什么样的问题？应该做怎样的修改？   TestThread.m_Mutex.WaitOne();   int m_index = m_threadIndex;   TestThread.m_Mutex.ReleaseMutex(); 仅做学习讨论。

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