多線程總結(jié)篇一多線程的優(yōu)先級(jí)

昵稱10504424 2013-05-08

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、為什么我設(shè)置了多線程的優(yōu)先級(jí)，可是線程的輸出并不是按優(yōu)先級(jí)的高低輸出??？

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace _05線程的優(yōu)先級(jí)
{
    class Program
    {
        static void Main(string[] args)
        {
            Thread[]t = new Thread[5];

            t[0] =new Thread( new ThreadStart(Tell));
            t[0].Name = "Lowest";
            t[0].Priority = ThreadPriority.Lowest;

            t[1] = new Thread(new ThreadStart(Tell));
            t[1].Name = "BelowNormal";
            t[1].Priority = ThreadPriority.BelowNormal;

            t[2] = new Thread(new ThreadStart(Tell));
            t[2].Name = "Normal";

            t[3] = new Thread(new ThreadStart(Tell));
            t[3].Name = "AboveNormal";
            t[3].Priority = ThreadPriority.AboveNormal;

            t[4] = new Thread(new ThreadStart(Tell));
            t[4].Name = "Highest";
            t[4].Priority = ThreadPriority.Highest;

            foreach (Thread itemt in t)
            {
                itemt.Start();
            }
            Console.ReadLine();
        }
        public static void Tell()
        {
            Console.WriteLine("當(dāng)前線程為：{0},線程級(jí)別是{1}",Thread.CurrentThread.Name,Thread.CurrentThread.Priority);
        }
    }
}

　　運(yùn)行結(jié)果之一：

首先，解釋一下線程的優(yōu)先級(jí)：

線程的優(yōu)先級(jí)并不是你想象的先執(zhí)行哪個(gè)后執(zhí)行哪個(gè)
而是所有的線程不論優(yōu)先級(jí)高低都會(huì)執(zhí)行,
優(yōu)先級(jí)越高表示CPU分配給該線程的時(shí)間片越多,執(zhí)行時(shí)間就多
優(yōu)先級(jí)越低表示CPU分配給該線程的時(shí)間片越少,執(zhí)行時(shí)間就少

就這個(gè)問題我們可以做一些測(cè)試,看如下代碼：

View Code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace _05線程的優(yōu)先級(jí)_測(cè)試線程優(yōu)先級(jí)發(fā)生概率
{
    class Program
    {
        static void Main(string[] args)
        {
            Thread th1 = new Thread(delegate()
                {
                    for (int i = 0; i < 100; i++)
                    {
                        Console.Write("H");
                    }
                });
         //   th1.Priority = ThreadPriority.Highest;

            Thread th2 = new Thread(delegate()
                {
                    for (int i = 0; i < 100; i++)
                    {
                        Console.Write("A");
                    }
                }
                );
         //   th2.Priority = ThreadPriority.AboveNormal;

            Thread th3 = new Thread(delegate()
                {
                    for (int i = 0; i < 100; i++)
                    {
                        Console.Write("N");
                    }
                }
                );
          //  th3.Priority = ThreadPriority.Normal;

            Thread th4 = new Thread(delegate()
                {
                    for (int i = 0; i < 100; i++)
                    {
                        Console.Write("B");
                    }
                }
                );
         //   th4.Priority = ThreadPriority.BelowNormal;

            Thread th5 = new Thread(delegate()
                {
                    for (int i = 0; i < 100; i++)
                    {
                        Console.Write("L");
                    }
                }
                );
         //   th5.Priority = ThreadPriority.Lowest;

            th1.Start(); th2.Start(); th3.Start(); th4.Start(); th5.Start();

            Console.ReadKey();
        }
    }
}

運(yùn)行結(jié)果之一：

將注釋代碼取消注釋，運(yùn)行結(jié)果之一：

總結(jié)一句話就是：我們給線程分配優(yōu)先級(jí)增加或減少的是該線程被優(yōu)先執(zhí)行的概率：

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