C# 多线程的自动管理(线程池) - 四联光电智能照明论坛

using System;
using System.Collections;
using System.Threading;
namespace ThreadExample
{
/// <summary>
/// 这是用来保存信息的数据结构，将作为参数被传递
/// </summary>
public class SomeState
{
public int Cookie;
public SomeState(int iCookie)
{
Cookie = iCookie;
}
}
public class Alpha
{
public Hashtable HashCount;
public ManualResetEvent eventX;
public static int iCount = 0;
public static int iMaxCount = 0;
public Alpha(int MaxCount)
{
HashCount = new Hashtable(MaxCount);
iMaxCount = MaxCount;
}
/// <summary>
/// 线程池里的线程将调用 Beta()方法
/// </summary>
/// <param name="state"></param>
public void Beta(Object state)
{
// 输出当前线程的 hash 编码值和 Cookie 的值
Console.WriteLine(" {0} {1} :", Thread.CurrentThread.GetHashCode(), ((SomeState)state).Cookie);
Console.WriteLine("HashCount.Count=={0}, Thread.CurrentThread.GetHash Code()=={1}", HashCount.Count,
Thread.CurrentThread.GetHashCode());
lock (HashCount)
{
// 如果当前的 Hash 表中没有当前线程的 Hash 值，则添加之
if (!HashCount.ContainsKey(Thread.CurrentThread.GetHashCode()))
HashCount.Add(Thread.CurrentThread.GetHashCode(), 0);
HashCount[Thread.CurrentThread.GetHashCode()] = ((int)HashCount[Thread.CurrentThread.GetHashCode()]) + 1;
}
Thread.Sleep(2000);
// Interlocked.Increment() 操作是一个原子操作，具体请看下面说明
Interlocked.Increment(ref iCount);
if (iCount == iMaxCount)
{
Console.WriteLine();
Console.WriteLine("Setting eventX ");
eventX.Set();
}
}
}
public class SimplePool
{
public static void Main(string[] args)
{
Console.WriteLine("Thread Pool Sample:");
bool W2K = false;
// 允许线程池中运行最多 10 个线程
int MaxCount = 10;
// 新建 ManualResetEvent 对象并且初始化为无信号状态
ManualResetEvent eventX = new ManualResetEvent(false);
Console.WriteLine("Queuing {0} items to Thread Pool", MaxCount);
// 注意初始化 oAlpha 对象的 eventX 属性
Alpha oAlpha = new Alpha(MaxCount);
oAlpha.eventX = eventX;
Console.WriteLine("Queue to Thread Pool 0");
try
{
// 将工作项装入线程池
// 这里要用到 Windows 2000 以上版本才有的 API，所以可能出现 NotSupp ortException 异常
ThreadPool.QueueUserWorkItem(new WaitCallback(oAlpha.Beta), new SomeState(0));
W2K = true;
}
catch (NotSupportedException)
{
Console.WriteLine("These API's may fail when called on a non-Wind ows 2000 system.");
W2K = false;
}
if (W2K) // 如果当前系统支持 ThreadPool 的方法.
{
for (int iItem = 1; iItem < MaxCount; iItem++)
{
// 插入队列元素
Console.WriteLine("Queue to Thread Pool {0}", iItem);
ThreadPool.QueueUserWorkItem(new WaitCallback(oAlpha.Beta), new SomeState(iItem));
}
Console.WriteLine("Waiting for Thread Pool to drain");
// 等待事件的完成，即线程调用 ManualResetEvent.Set() 方法
eventX.WaitOne(Timeout.Infinite, true);
// WaitOne() 方法使调用它的线程等待直到 eventX.Set() 方法被调用
Console.WriteLine("Thread Pool has been drained (Event fired)");
Console.WriteLine();
Console.WriteLine("Load across threads");
foreach (object o in oAlpha.HashCount.Keys)
{
Console.WriteLine("{0} {1}", o, oAlpha.HashCount[o]);
}
}
Console.ReadLine();
}
}
}

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