关于线程

Question

using System;
using System.Threading;public class CH3_3
{
Thread[] threads;
int whichThread;
int runCount;
public void CheckThread()
{
lock(this)
{
runCount++;
Console.WriteLine("Run Count {0}",runCount);
if(runCount > 4)
{
Console.WriteLine("Which Thread {0}",whichThread);
threads[whichThread].Abort();
runCount = 0;
whichThread++;
}
}
}
public void RunThread()
{
Boolean done = false;
while(!done) 
{
CheckThread();
}
}
public void StartThreads() 
{
threads = new Thread[3];
runCount = 0;
whichThread = 0;
for(int i =0; i<3; ++i) 
{
threads[i] = new Thread(new ThreadStart(RunThread));
threads[i].Start();
}
}
public static void Main()
{
CH3_3 app = new CH3_3();
app.StartThreads();
}
}运行结果是这样的:RunCount怎么到6的?

Answer 1

运行结果:
Run Count 1
Run Count 2
Run Count 3
Run Count 4
Run Count 5
Which Thread 0
Run Count 6
Which Thread 0
Run Count 1
Run Count 2
Run Count 3
Run Count 4
Run Count 5
Which Thread 1
Run Count 6
Which Thread 1
Run Count 1
Run Count 2
Run Count 3
Run Count 4
Run Count 5
Which Thread 2
Press any key to continue

Answer 2

楼主的结果没错啊 就是这个啊
if(runCount > 4) runCount  退出循环

Answer 3

我给的结果是没错的 但是为什么which Thread 0出现两次;而且Run Count 6会出现

Answer 4

按我的思想 ,运行结果应该是这样的啊!怎么回事
Run Count 1 
Run Count 2 
Run Count 3 
Run Count 4 
Run Count 5 
Which Thread 0 
Run Count 1 
Run Count 2 
Run Count 3 
Run Count 4 
Run Count 5 
Which Thread 1 
Run Count 1 
Run Count 2 
Run Count 3 
Run Count 4 
Run Count 5 
Which Thread 2 
Press any key to continue

Answer 5

你忽略了Abort的作用。
threads[whichThread].Abort();
runCount = 0;
whichThread++;你仔细想想，后两句是否能被保证执行？
改成这样，大概可以得到你想要的结果。
runCount = 0;
whichThread++;
Thread.CurrentThread.Abort();

Answer 6

threads[whichThread].Abort();这句的意思是终止线程，也就是不在执行线程，也就不会再继续执行下面的语句，要想验证很简单，你在程序上加个断点，调试看下，就知道是怎么回事了，看能不能执行到
runCount = 0;
whichThread++;

Answer 7

线程的运行顺序是未知的
出现6的原因可以能是
你在生成3个线程的时候的···你开始生成的线程运行过不只1次·可能是1，2，3，4.。。次····· 
你Count是全局的··所以就肯定不值3··· public void CheckThread()
    {
        lock(this)
        {
            runCount++;
            Console.WriteLine("Run Count {0}",runCount);
            if(runCount > 4)
            {
                Console.WriteLine("Which Thread {0}",whichThread);
                threads[whichThread].Abort();
                runCount = 0;
                whichThread++;
            }
        }
    }改为： public void CheckThread()
    {
        Monitor.Enter(this);
       {
            runCount++;
            Console.WriteLine("Run Count {0}",runCount);
            if(runCount > 4)
            {
                Console.WriteLine("Which Thread {0}",whichThread);
                threads[whichThread].Abort();
                runCount = 0;
                whichThread++;
            }
        }
    }

Answer 8

    public static void Main()
    {
        CH3_3 app = new CH3_3();
        app.StartThreads();
Monitor.Enter(app);
    }建议一般不要lock(this)

Answer 9

其实我的本意是想看下lock的应用,只是输出结果实在有点不解,那这个问题就这样了