二部分組成,一個線程管理類ThreadManager,一個線程類MyThread
Test類是用來測試的
1.ThreadManager.cs
using System;
using System.Threading;
using System.Collections;
namespace CustomThreadPool
{
/// <summary>
/// 線程管理器,會開啟或喚醒一個線程去執行指定的回調方法
/// </summary>
public class ThreadManager
{
private static ArrayList threadList = new ArrayList(); //線程列表,靜態
//不允許建立執行個體
private ThreadManager()
{
}
/// <summary>
/// 靜態方法,開啟或喚醒一個線程去執行指定的回調方法
/// </summary>
/// <param >委託執行個體</param>
/// <param >傳遞給回調方法的參數</param>
/// <param >當沒有可用的線程時的等待時間,以毫秒為單位</param>
/// <returns></returns>
public static bool QueueUserWorkItem(WaitCallback waitCallback, Object obj, int timeOut)
{
//鎖住共用資源,實現安全執行緒
lock(threadList)
{
try
{
//如果線程列表為空白,填充線程列表
if (threadList.Count == 0)
{
InitThreadList();
}
long startTime = DateTime.Now.Ticks;
do
{
//遍曆線程列表,找出可用的線程
foreach(MyThread myThread in threadList)
{
//線程為空白,需要建立線程
if (myThread.T == null)
{
myThread.Start(waitCallback, obj, false);
return true;
}
else
if (myThread.T.ThreadState == ThreadState.Suspended)
{
//線程為掛起狀態,喚醒線程
myThread.Start(waitCallback, obj, true);
return true;
}
}
//線上程 Sleep 前釋放鎖
Monitor.PulseAll(threadList);
Thread.Sleep(500);
}
while (((DateTime.Now.Ticks - startTime) / 10000) < timeOut);
}
finally
{
Monitor.Exit(threadList);
}
}
return false;
}
//使用 MyThread 對象填充線程列表,注意,這個時候線程並沒有啟動
private static void InitThreadList()
{
threadList = new ArrayList();
for (int i = 0; i < 10; i++)
{
MyThread t = new MyThread();
threadList.Add(t);
}
}
}
}
2.MyThread.cs
using System;
using System.Threading;
namespace CustomThreadPool
{
/// <summary>
/// 封裝 .NET 架構提供的 Thread
/// </summary>
internal class MyThread
{
private Thread t; //線程
private WaitCallback w; //委託,這裡直接用 .NET 架構內建的,也可以根據需要自己定義一個
private Object o; //傳遞給符合委託的回調方法的參數值,根據委託的定義而定
/// <summary>
/// 執行回調方法的線程
/// </summary>
public Thread T
{
get
{
return t;
}
}
public MyThread()
{
}
/// <summary>
/// 開啟新線程或喚醒線程,去執行回調方法
/// </summary>
/// <param >用回調方法執行個體化了的委託執行個體</param>
/// <param >傳遞給回調方法的參數值</param>
/// <param >true 表示線程為掛起狀態,false 則表示線程還沒建立</param>
public void Start(WaitCallback w, Object o, bool isSuspend)
{
//開啟新線程或喚醒線程前,先設定
this.w = w;
this.o = o;
//線程為掛起狀態,喚醒線程繼續執行
if (isSuspend)
{
t.Resume();
}
else
{//線程還沒有建立,建立一個新線程,並執行
t = new Thread(new ThreadStart(this.ThreadProc));
t.Start();
}
}
/// <summary>
/// 線程執行的方法
/// </summary>
private void ThreadProc()
{
//死迴圈,使線程喚醒後不是退出,而是繼續通過委託執行回調方法
while (true)
{
//通過委託執行回調方法
w(o);
t.Suspend();
}
}
}
}
3.Test.cs
using System;
using System.Threading;
namespace CustomThreadPool
{
/// <summary>
/// 測試自訂線程池
/// </summary>
class Test
{
/// <summary>
/// 應用程式的主進入點。
/// </summary>
[STAThread]
static void Main(string[] args)
{
//
// TODO: 在此處添加代碼以啟動應用程式
//
for (int i = 0; i < 5; i++)
{
Console.WriteLine("Start thread {0}", i.ToString());
Thread t = new Thread(new ThreadStart(WorkThread));
t.Start();
}
Console.ReadLine();
Thread.CurrentThread.Abort();
}
public static void WorkThread()
{
for (int i = 0; i < 10; i++)
{
if (i % 2 == 0)
{
if (!ThreadManager.QueueUserWorkItem(new WaitCallback(ThreadProcOne), i, 2000))
{
Console.WriteLine("Failed" + i.ToString());
}
}
else
{
if (!ThreadManager.QueueUserWorkItem(new WaitCallback(ThreadProcTwo), i, 2000))
{
Console.WriteLine("Failed" + i.ToString());
}
}
}
Thread.CurrentThread.Abort();
}
public static void ThreadProcOne(Object stateInfo)
{
Console.WriteLine("Test custom threadpool:" + ((int)stateInfo).ToString());
}
public static void ThreadProcTwo(Object stateInfo)
{
Console.WriteLine("Change work:" + ((int)stateInfo).ToString());
}
}
}