一段比较经典的多线程学习代码

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一段比较经典多线程学习代码

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。

http://wucountry.cnblogs.com/archive/2006/06/19/429649.html

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