資料同步 線程 c#

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手動進行線程同步

1>使用WaitHandle做資料同步或者資料等待 根據的是

AutoResetEvent() 是否阻塞 如果沒有阻塞則正常 waitall是全部沒有阻塞就可以通過 waitall是一個沒有阻塞就通過

 

using System;using System.Threading;public sealed class App {    // Define an array with two AutoResetEvent WaitHandles.    static WaitHandle[] waitHandles = new WaitHandle[]     {        new AutoResetEvent(false),        new AutoResetEvent(false)    };    // Define a random number generator for testing.    static Random r = new Random();    static void Main()     {        // Queue up two tasks on two different threads;         // wait until all tasks are completed.        DateTime dt = DateTime.Now;        Console.WriteLine("Main thread is waiting for BOTH tasks to complete.");        ThreadPool.QueueUserWorkItem(new WaitCallback(DoTask), waitHandles[0]);        ThreadPool.QueueUserWorkItem(new WaitCallback(DoTask), waitHandles[1]);        WaitHandle.WaitAll(waitHandles);        // The time shown below should match the longest task.        Console.WriteLine("Both tasks are completed (time waited={0})",             (DateTime.Now - dt).TotalMilliseconds);        // Queue up two tasks on two different threads;         // wait until any tasks are completed.        dt = DateTime.Now;        Console.WriteLine();        Console.WriteLine("The main thread is waiting for either task to complete.");        ThreadPool.QueueUserWorkItem(new WaitCallback(DoTask), waitHandles[0]);        ThreadPool.QueueUserWorkItem(new WaitCallback(DoTask), waitHandles[1]);        int index = WaitHandle.WaitAny(waitHandles);        // The time shown below should match the shortest task.        Console.WriteLine("Task {0} finished first (time waited={1}).",            index + 1, (DateTime.Now - dt).TotalMilliseconds);    }    static void DoTask(Object state)     {        AutoResetEvent are = (AutoResetEvent) state;        int time = 1000 * r.Next(2, 10);        Console.WriteLine("Performing a task for {0} milliseconds.", time);        Thread.Sleep(time);        are.Set();    }}

 

 

2> C# 4.0  Barrier類

        public static void Speak()        {            for (int i = 0; i < 5; i++)            {                Console.Write(i + "");                d.SignalAndWait();//等待 當有3個線程進入了這個方法的時候就可以繼續            }        }        /// <summary>        /// 當到達3個線程觸發Action<Barrier>中的內容 第一個是要求達到的線程數        /// </summary>        static Barrier d = new Barrier(3, d1 => { Console.WriteLine(""); });        static void Main(string[] args)        {            new Thread(Speak).Start();            new Thread(Speak).Start();            new Thread(Speak).Start();            Console.ReadKey();        }

 

資料同步 線程 c#