多线程的锁定
我做了一个小测试是关于多线程的，但是结果与我期望的不同。
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
namespace ThreadTest
{
public class LockCodeArea
{
private int count = 10;
public void ReduceCount()
{
while (true)
{
lock (this)
{
Console.WriteLine("Current Count:{0}", count);
Console.WriteLine("Current thread HashCode is :{0}", Thread.CurrentThread.GetHashCode());
Thread.Sleep(100);
--count;
if (count > 0)
continue;
else
break;
}
}
}
}
class Program
{
static void Main(string[] args)
{
LockCodeArea testClass = new LockCodeArea();
Thread firsThread = new Thread(new ThreadStart(testClass.ReduceCount));
Thread secondThread = new Thread(new ThreadStart(testClass.ReduceCount));
Console.WriteLine("Main HashCode is :{0}", Thread.CurrentThread.GetHashCode());
Console.WriteLine("First thread Hashcode is :{0}",firsThread.GetHashCode());
Console.WriteLine("Second thread HashCode is :{0}", secondThread.GetHashCode());
firsThread.Start();
secondThread.Start();
if (!firsThread.IsAlive)
Thread.Sleep(1000);
Console.WriteLine("Press Any Key to Continue!");
Console.WriteLine("Main HashCode is :{0}", Thread.CurrentThread.GetHashCode());
Console.ReadLine();
}
}
}
本来是希望使用Lock之后，只存在要么firstThread减数，要么secondThread减数，为什么会有firstThread和secondThead
交替减数的情况。我已经使用Lock锁定代码区了。？？？各位帮帮忙呀。
[解决办法]
注意，lock锁定的块同一时间只有一个线程能访问，你目前的代码锁定的是while内的代码。也就是说有2个线程都到达了循环内，一个现成continue的时候另一个线程乘机执行Console.WriteLine....
如果要同一时间只有1个线程能执行整个循环，就要把整个循环（10次）都锁住，也就是说：
public void ReduceCount() { lock (this) { while (true) { Console.WriteLine("Current Count:{0}", count); Console.WriteLine("Current thread HashCode is :{0}", Thread.CurrentThread.GetHashCode()); Thread.Sleep(100); --count; if (count > 0) continue; else break; } } }