实例介绍
【实例简介】
【实例截图】
【核心代码】
using System;
using System.Threading;
using System.Timers;
/*
* An interesting discussion is on: http://www.dotnet247.com/247reference/msgs/5/25020.aspx
* ThreadPool is designed to work with IO Completion Ports, it seems
*
* A slideshow on threads: http://research.microsoft.com/collaboration/university/europe/rotor/wshop-cambridge2threads.ppt
*
* Referenced rotor source: sscli\clr\src\vm\win32threadpool.cpp
*/
/*
* 测试代码改编自Marc Clifton http://www.codeproject.com/KB/threads/threadtests.aspx
*/
namespace ThreadTests
{
using Amib.Threading;//for use SmartThreadPool
class ThreadTest
{
static bool done = false;
static decimal count2 = 0;
static int threadDone = 0;//标志启用线程数?
static System.Timers.Timer timer = new System.Timers.Timer(1000);
static decimal[] threadPoolCounters = new decimal[10];
static Thread[] threads = new Thread[10];
static System.Timers.Timer[] threadTimers = new System.Timers.Timer[10];
static void Main(string[] args)
{
timer.Stop();
/*当 AutoReset 设置为 false 时，Timer 只在第一个 Interval 过后引发一次 Elapsed 事件。
若要保持以 Interval 时间间隔引发 Elapsed 事件，请将 AutoReset 设置为 true。*/
timer.AutoReset = false;
timer.Elapsed = new ElapsedEventHandler(OnTimerEvent);//当timer.Start()时，触发事件
decimal total = 0;
// raw test
decimal count1 = SingleThreadTest();//单一线程，一跑到底
Console.WriteLine("Single thread count = " count1.ToString());
// create one thread, increment counter, destroy thread, repeat
Console.WriteLine();
CreateAndDestroyTest();//创建一个线程，运算，然后销毁该线程 重复前面的动作
Console.WriteLine("Create and destroy per count = " count2.ToString());
// Create 10 threads and run them simultaneously
//一次性创建10个线程，然后遍历使线程执行运算
Console.WriteLine();
InitThreadPoolCounters();
InitThreads();
StartThreads();
while (threadDone != 10) { };
Console.WriteLine("10 simultaneous threads:");
for (int i = 0; i < 10; i )
{
Console.WriteLine("T" i.ToString() " = " threadPoolCounters[i].ToString() " ");
total = threadPoolCounters[i];
}
Console.WriteLine("Total = " total.ToString());
Console.WriteLine();
Console.WriteLine("///////////////////////////////////////////////////");
// using ThreadPool
//直接通过线程池的QueueUserWorkItem方法，按队列执行10个任务
Console.WriteLine();
Console.WriteLine("ThreadPool:");
InitThreadPoolCounters();
QueueThreadPoolThreads();
while (threadDone != 10) { };
Console.WriteLine("ThreadPool: 10 simultaneous threads:");
total = 0;
for (int i = 0; i < 10; i )
{
// threadTimers[i].Stop();
// threadTimers[i].Dispose();
Console.WriteLine("T" i.ToString() " = " threadPoolCounters[i].ToString() " ");
total = threadPoolCounters[i];
}
Console.WriteLine("Total = " total.ToString());
// using SmartThreadPool
//通过Amir Bar的SmartThreadPool线程池，利用QueueUserWorkItem方法，按队列执行10个任务
Console.WriteLine();
Console.WriteLine("SmartThreadPool:");
InitThreadPoolCounters();
QueueSmartThreadPoolThreads();
while (threadDone != 10) { };
Console.WriteLine("SmartThreadPool: 10 simultaneous threads:");
total = 0;
for (int i = 0; i < 10; i )
{
Console.WriteLine("T" i.ToString() " = " threadPoolCounters[i].ToString() " ");
total = threadPoolCounters[i];
}
Console.WriteLine("Total = " total.ToString());
// using ManagedThreadPool
//通过Stephen Toub改进后的线程池，利用QueueUserWorkItem方法，按队列执行10个任务
Console.WriteLine();
Console.WriteLine("ManagedThreadPool:");
InitThreadPoolCounters();
QueueManagedThreadPoolThreads();
while (threadDone != 10) { };
Console.WriteLine("ManagedThreadPool: 10 simultaneous threads:");
total = 0;
for (int i = 0; i < 10; i )
{
Console.WriteLine("T" i.ToString() " = " threadPoolCounters[i].ToString() " ");
total = threadPoolCounters[i];
}
Console.WriteLine("Total = " total.ToString());
// using C#4.0 Parallel
//通过Tasks.Parallel.For进行并行运算
Console.WriteLine();
Console.WriteLine("Parallel:");
InitThreadPoolCounters();
UseParallelTasks();
while (threadDone != 10) { };
Console.WriteLine("Parallel: 10 simultaneous threads:");
total = 0;
for (int i = 0; i < 10; i )
{
Console.WriteLine("T" i.ToString() " = " threadPoolCounters[i].ToString() " ");
total = threadPoolCounters[i];
}
Console.WriteLine("Total = " total.ToString());
}
/// <summary>
/// 单一线程，一跑到底
/// </summary>
/// <returns></returns>
static decimal SingleThreadTest()
{
done = false;
decimal counter = 0;
timer.Start();
while (!done)
{
counter;
}
return counter;
}
/// <summary>
/// 创建一个线程，运算，然后销毁该线程 重复前面的动作
/// </summary>
static void CreateAndDestroyTest()
{
done = false;
timer.Start();
while (!done)
{
Thread counterThread = new Thread(new ThreadStart(Count1Thread));
counterThread.IsBackground = true;//后台线程
counterThread.Start();
while (counterThread.IsAlive) { };
}
}
static void Count1Thread()
{
count2;
}
static void Count2Thread()
{
int n = Convert.ToInt32(Thread.CurrentThread.Name);//取数组索引
while (!done)
{
threadPoolCounters[n];
}
Interlocked.Increment(ref threadDone);//以原子操作的形式保证threadDone递增
}
static void Count3Thread(object state)
{
int n = (int)state;
while (!done)
{
threadPoolCounters[n];
}
Interlocked.Increment(ref threadDone);
}
static object Count4Thread(object state)
{
int n = (int)state;
while (!done)
{
threadPoolCounters[n];
}
Interlocked.Increment(ref threadDone);
return null;
}
static void Count5Thread(object state)
{
int n = (int)state;
while (!done)
{
threadPoolCounters[n];
}
Interlocked.Increment(ref threadDone);
}
static void Count6Thread(object state)
{
int n = (int)state;
while (!done)
{
threadPoolCounters[n];
}
Interlocked.Increment(ref threadDone);
}
/*BEGIN
* TimerThread0~TimerThread9是没有使用的测试方法，作者写此10个方法的时候可能没有考虑好合适的传参方法
*/
//static void TimerThread0(object src, ElapsedEventArgs e)
//{
// threadPoolCounters[0];
//}
//static void TimerThread1(object src, ElapsedEventArgs e)
//{
// threadPoolCounters[1];
//}
//static void TimerThread2(object src, ElapsedEventArgs e)
//{
// threadPoolCounters[2];
//}
//static void TimerThread3(object src, ElapsedEventArgs e)
//{
// threadPoolCounters[3];
//}
//static void TimerThread4(object src, ElapsedEventArgs e)
//{
// threadPoolCounters[4];
//}
//static void TimerThread5(object src, ElapsedEventArgs e)
//{
// threadPoolCounters[5];
//}
//static void TimerThread6(object src, ElapsedEventArgs e)
//{
// threadPoolCounters[6];
//}
//static void TimerThread7(object src, ElapsedEventArgs e)
//{
// threadPoolCounters[7];
//}
//static void TimerThread8(object src, ElapsedEventArgs e)
//{
// threadPoolCounters[8];
//}
//static void TimerThread9(object src, ElapsedEventArgs e)
//{
// threadPoolCounters[9];
//}
/*END*/
/// <summary>
/// 将数组和线程数标志threadDone回到初始状态
/// </summary>
static void InitThreadPoolCounters()
{
threadDone = 0;
for (int i = 0; i < 10; i )
{
threadPoolCounters[i] = 0;
}
}
/// <summary>
/// 初始化10个线程
/// </summary>
static void InitThreads()
{
for (int i = 0; i < 10; i )
{
threads[i] = new Thread(new ThreadStart(Count2Thread));
threads[i].IsBackground = true;
threads[i].Name = i.ToString();//将当前线程的Name赋值为数组索引，在Count2Thread方法中获取对应数组
}
}
/// <summary>
/// 开始多线程运算
/// </summary>
static void StartThreads()
{
done = false;
timer.Start();
for (int i = 0; i < 10; i )
{
threads[i].Start();
}
}
/// <summary>
/// ThreadPool测试
/// </summary>
static void QueueThreadPoolThreads()
{
done = false;
for (int i = 0; i < 10; i )
{
// System.Timers.Timer t=new System.Timers.Timer(1);
// threadTimers[i]=t;
// t.AutoReset=true;
//ThreadPool.QueueUserWorkItem(new WaitCallback(Count3Thread), i);
WaitCallback wcb = new WaitCallback(Count3Thread);
int workerThreads, availabeThreads;
ThreadPool.GetAvailableThreads(out workerThreads, out availabeThreads);
if (workerThreads > 0)//可用线程数>0
{
ThreadPool.QueueUserWorkItem(wcb, i);
}
else
{
//to do 可以采取一种策略，让这个任务合理地分配给线程
}
}
/*
threadTimers[0].Elapsed =new ElapsedEventHandler(TimerThread0);
threadTimers[1].Elapsed =new ElapsedEventHandler(TimerThread1);
threadTimers[2].Elapsed =new ElapsedEventHandler(TimerThread2);
threadTimers[3].Elapsed =new ElapsedEventHandler(TimerThread3);
threadTimers[4].Elapsed =new ElapsedEventHandler(TimerThread4);
threadTimers[5].Elapsed =new ElapsedEventHandler(TimerThread5);
threadTimers[6].Elapsed =new ElapsedEventHandler(TimerThread6);
threadTimers[7].Elapsed =new ElapsedEventHandler(TimerThread7);
threadTimers[8].Elapsed =new ElapsedEventHandler(TimerThread8);
threadTimers[9].Elapsed =new ElapsedEventHandler(TimerThread9);
for (int i=0; i<10; i )
{
threadTimers[i].Start();
}
*/
timer.Start();
}
/// <summary>
/// SmartThreadPool测试
/// </summary>
static void QueueSmartThreadPoolThreads()
{
SmartThreadPool smartThreadPool = new SmartThreadPool();
// Create a work items group that processes
// one work item at a time
IWorkItemsGroup wig = smartThreadPool.CreateWorkItemsGroup(1);
done = false;
timer.Start();
for (int i = 0; i < 10; i )
{
wig.QueueWorkItem(new WorkItemCallback(Count4Thread), i);
}
// Wait for the completion of all work items in the work items group
wig.WaitForIdle();
smartThreadPool.Shutdown();
}
/// <summary>
/// ManagedThreadPool测试
/// </summary>
static void QueueManagedThreadPoolThreads()
{
done = false;
timer.Start();
for (int i = 0; i < 10; i )
{
Toub.Threading.ManagedThreadPool.QueueUserWorkItem(new WaitCallback(Count5Thread), i);
}
}
/// <summary>
/// 并行运算测试
/// </summary>
static void UseParallelTasks()
{
done = false;
timer.Start();
// System.Threading.Tasks.Parallel.For - for 循环的并行运算
System.Threading.Tasks.Parallel.For(0, 10, (i) => { Count6Thread(i); });
}
static void OnTimerEvent(object src, ElapsedEventArgs e)
{
done = true;
}
}
}
标签： thread threadpool
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