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  • C#自定义线程池

    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

        {

            //线程列表,静态

            private static ArrayList threadList = new ArrayList();

           

            //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

        {

            //线程

            private Thread t;      

            //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 WaitCallback w;

            //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

            private Object o;      

     

            ///<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 Main(string[] args)

            {

                //

                // 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());

            }

        }

    }

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  • 原文地址:https://www.cnblogs.com/gjhjoy/p/3535649.html
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