c#线程Thread示例

//--------------------------- Sub-thread class ---------------------------------------
//------------------------------------------------------------------------------------
//---File:          clsSubThread
//---Description:   The sub-thread template class file
//---Author:        Knight
//------------------------------------------------------------------------------------
//---------------------------{Sub-thread class}---------------------------------------
namespace ThreadTemplate
{
using System;
using System.Threading;
using System.IO;
/// <summary>
/// Summary description for clsSubThread.
/// </summary>
public class clsSubThread:IDisposable
{
private Thread thdSubThread = null;
private Mutex mUnique = new Mutex();

private bool blnIsStopped;
private bool blnSuspended;
private bool blnStarted;
private int nStartNum;

public bool IsStopped
{
get{ return blnIsStopped; }
}
public bool IsSuspended
{
get{ return blnSuspended; }
}
public int ReturnValue
{
get{ return nStartNum;}
}

  
public clsSubThread( int StartNum )
{
//
// TODO: Add constructor logic here
//
blnIsStopped = true;
blnSuspended = false;
blnStarted = false;

nStartNum = StartNum;
}

/// <summary>
/// Start sub-thread
/// </summary>
public void Start()
{
if( !blnStarted )
{
thdSubThread = new Thread( new ThreadStart( SubThread ) );
blnIsStopped = false;
blnStarted = true;
thdSubThread.Start();
}
}

/// <summary>
/// Thread entry function
/// </summary>
private void SubThread()
{
do
{
// Wait for resume-command if got suspend-command here
mUnique.WaitOne();
mUnique.ReleaseMutex();

nStartNum++;

Thread.Sleep(1000); // Release CPU here
}while( blnIsStopped == false );
}

/// <summary>
/// Suspend sub-thread
/// </summary>
public void Suspend()
{
if( blnStarted && !blnSuspended )
{
blnSuspended = true;
mUnique.WaitOne();
}
}

/// <summary>
/// Resume sub-thread
/// </summary>
public void Resume()
{
if( blnStarted && blnSuspended )
{
blnSuspended = false;
mUnique.ReleaseMutex();
}
}

/// <summary>
/// Stop sub-thread
/// </summary>
public void Stop()
{
if( blnStarted )
{
if( blnSuspended )
Resume();

blnStarted = false;
blnIsStopped = true;
thdSubThread.Join();
}
}
#region IDisposable Members
/// <summary>
/// Class resources dispose here
/// </summary>
public void Dispose()
{
// TODO:  Add clsSubThread.Dispose implementation
Stop();//Stop thread first
GC.SuppressFinalize( this );
}

#endregion
}
}

那么对于调用呢，就非常简单了，如下：
// Create new sub-thread object with parameters
clsSubThread mySubThread = new clsSubThread( 5 );

mySubThread.Start();//Start thread

Thread.Sleep( 2000 );
mySubThread.Suspend();//Suspend thread

Thread.Sleep( 2000 );
mySubThread.Resume();//Resume thread

Thread.Sleep( 2000 );
mySubThread.Stop();//Stop thread

//Get thread's return value
Debug.WriteLine( mySubThread.ReturnValue );

//Release sub-thread object
mySubThread.Dispose();

在回过头来看看前面所说的三个问题。
对于问题一来说，首先需要局部成员的支持，那么
private Mutex mUnique = new Mutex();

private bool blnIsStopped;
private bool blnSuspended;
private bool blnStarted;

光看成员名称，估计大家都已经猜出其代表的意思。接下来需要修改线程入口函数，要是这些开关变量能发挥作用，那么看看SubThread这个函数。
/// <summary>
/// Thread entry function
/// </summary>
private void SubThread()
{
do
{
// Wait for resume-command if got suspend-command here
mUnique.WaitOne();
mUnique.ReleaseMutex();

nStartNum++;

Thread.Sleep(1000);
}while( blnIsStopped == false );
}

函数比较简单，不到十句，可能对于“blnIsStopped == false”这个判断来说，大家还比较好理解，这是一个普通的判断，如果当前Stop开关打开了，就停止循环；否则一直循环。
大家比较迷惑的可能是如下这两句：
mUnique.WaitOne();
mUnique.ReleaseMutex();
这两句的目的是为了使线程在Suspend操作的时候能发挥效果，为了解释这两句，需要结合Suspend和Resume这两个方法，它俩的代码如下。
/// <summary>
/// Suspend sub-thread
/// </summary>
public void Suspend()
{
if( blnStarted && !blnSuspended )
{
blnSuspended = true;
mUnique.WaitOne();
}
}

/// <summary>
/// Resume sub-thread
/// </summary>
public void Resume()
{
if( blnStarted && blnSuspended )
{
blnSuspended = false;
mUnique.ReleaseMutex();
}
}

mUnique.WaitOne();
mUnique.ReleaseMutex();