自定义线程池－c#的简单实现
下面是代码，希望大家提出更好的建议：
1.ThreadManager.cs
using System;
using System.Threading;
using System.Collections;
namespace CustomThreadPool
{
/// <summary>
/// 线程管理器，会开启或唤醒一个线程去执行指定的回调方法
/// </summary>
public class ThreadManager
{
private static ArrayList threadList = new ArrayList(); //线程列表，静态
//不允许创建实例
private ThreadManager()
{
}
/// <summary>
/// 静态方法，开启或唤醒一个线程去执行指定的回调方法
/// </summary>
/// <param name="waitCallback">委托实例</param>
/// <param name="obj">传递给回调方法的参数</param>
/// <param name="timeOut">当没有可用的线程时的等待时间，以毫秒为单位</param>
/// <returns></returns>
public static bool QueueUserWorkItem(WaitCallback waitCallback, Object obj, int timeOut)
{
//锁住共享资源，实现线程安全
lock(threadList)
{
try
{
//如果线程列表为空，填充线程列表
if (threadList.Count == 0)
{
InitThreadList();
}
long startTime = DateTime.Now.Ticks;
do
{
//遍历线程列表，找出可用的线程
foreach(MyThread myThread in threadList)
{
//线程为空，需要创建线程
if (myThread.T == null)
{
myThread.Start(waitCallback, obj, false);
return true;
}
else if (myThread.T.ThreadState == ThreadState.Suspended)
{//线程为挂起状态，唤醒线程
myThread.Start(waitCallback, obj, true);
return true;
}
}
//在线程 Sleep 前释放锁
Monitor.PulseAll(threadList);
Thread.Sleep(500);
}while (((DateTime.Now.Ticks - startTime) / 10000) < timeOut);
}
finally
{
Monitor.Exit(threadList);
}
}
return false;
}
//使用 MyThread 对象填充线程列表，注意，这个时候线程并没有启动
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>
/// 封装 .NET 框架提供的 Thread
/// </summary>
internal class MyThread
{
private Thread t; //线程
private WaitCallback w; //委托，这里直接用 .NET 框架自带的，也可以根据需要自己定义一个
private Object o; //传递给符合委托的回调方法的参数值，根据委托的定义而定
/// <summary>
/// 执行回调方法的线程
/// </summary>
public Thread T
{
get
{
return t;
}
}
public MyThread()
{
}
/// <summary>
/// 开启新线程或唤醒线程，去执行回调方法
/// </summary>
/// <param name="w">用回调方法实例化了的委托实例</param>
/// <param name="o">传递给回调方法的参数值</param>
/// <param name="isSuspend">true 表示线程为挂起状态，false 则表示线程还没创建</param>
public void Start(WaitCallback w, Object o, bool isSuspend)
{
//开启新线程或唤醒线程前，先设置
this.w = w;
this.o = o;
//线程为挂起状态，唤醒线程继续执行
if (isSuspend)
{
t.Resume();
}
else
{//线程还没有创建，创建一个新线程，并执行
t = new Thread(new ThreadStart(this.ThreadProc));
t.Start();
}
}
/// <summary>
/// 线程执行的方法
/// </summary>
private void ThreadProc()
{
//死循环，使线程唤醒后不是退出，而是继续通过委托执行回调方法
while (true)
{
//通过委托执行回调方法
w(o);
t.Suspend();
}
}
}
}
3.Test.cs
using System;
using System.Threading;
namespace CustomThreadPool
{
/// <summary>
/// 测试自定义线程池
/// </summary>
class Test
{
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void
{
//
// TODO: 在此处添加代码以启动应用程序
//
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());
}
}
}
