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详解 ManualResetEvent

时间:2014-05-26 10:50:15      阅读:341      评论:0      收藏:0      [点我收藏+]

今天详细说一下ManualResetEvent

它可以通知一个或多个正在等待的线程已发生事件,允许线程通过发信号互相通信,来控制线程是否可心访问资源

Reset to put ManualResetEvent in the non-signaled state.‘ data-guid="a1d0df5245131d9d7daa9b20c9f223ea">当一个线程开始一个活动(此活动必须完成后,其他线程才能开始)时,它调用 Reset 以将 ManualResetEvent 置于非终止状态。ManualResetEvent.‘ data-guid="bd0e9dfcd22ea50d3b564a1972fd7b93">此线程可被视为控制 ManualResetEventWaitOne on the ManualResetEvent will block, awaiting the signal.‘ data-guid="45d46b28fd6580daf91a97005647a49f">调用 ManualResetEvent 上的 WaitOne 的线程将阻止,并等待信号。Set to signal that the waiting threads can proceed.‘ data-guid="8e428f62caa115a26728f4b3e04c7dee">当控制线程完成活动时,它调用 Set 以发出等待线程可以继续进行的信号。并释放所有等待线程。

ManualResetEvent remains signaled until it is manually reset.‘ data-guid="6068fcf30a94953bb8f7bd2f84fc6647">一旦它被终止,ManualResetEvent 将保持终止状态,直到它被手动重置。WaitOne return immediately.‘ data-guid="0f3ec962878650f739145cdfe51b8ea1">即对 WaitOne 的调用将立即返回。

WaitOne return immediately.‘ data-guid="0f3ec962878650f739145cdfe51b8ea1">上面是它的功能描述,你可能会有点晕。我会用代码一点一点解释它,看完我写的这些内容,你自己运行一下代码你就会明白它的功能

WaitOne return immediately.‘ data-guid="0f3ec962878650f739145cdfe51b8ea1">源代码:ManualResetEventDemo.rar

ManualResetEvent by passing a Boolean value to the constructor, true if the initial state is signaled and false otherwise.‘ data-guid="87baedb5428e63e7369d71c4001193d4">我们从初始化来开始讲

ManualResetEvent by passing a Boolean value to the constructor, true if the initial state is signaled and false otherwise.‘ data-guid="87baedb5428e63e7369d71c4001193d4">ManualResetEvent by passing a Boolean value to the constructor, true if the initial state is signaled and false otherwise.‘ data-guid="87baedb5428e63e7369d71c4001193d4">可以通过将布尔值传递给构造函数来控制 ManualResetEvent 的初始状态,如果初始状态处于终止状态,为 true;否则为 false

ManualResetEvent by passing a Boolean value to the constructor, true if the initial state is signaled and false otherwise.‘ data-guid="87baedb5428e63e7369d71c4001193d4">我用代码 让大家看一下什么是终止状态和非止状态

ManualResetEvent by passing a Boolean value to the constructor, true if the initial state is signaled and false otherwise.‘ data-guid="87baedb5428e63e7369d71c4001193d4">先看一下代码

class Program
   {
       static ManualResetEvent _mre = new ManualResetEvent(false);
       static void Main(string[] args)
       {
           Thread[] _threads = new Thread[3];
           for (int i = 0; i < _threads.Count(); i++)
           {
               _threads[i] = new Thread(ThreadRun);
               _threads[i].Start();
           }
         
       }
 
       static void ThreadRun()
       {
           int _threadID = 0;
           while (true)
           {
               _mre.WaitOne();
               _threadID = Thread.CurrentThread.ManagedThreadId;
               Console.WriteLine("current Tread is " + _threadID);
               Thread.Sleep(TimeSpan.FromSeconds(2));
                
           }
       }
   }

当初始化为true时,为终止状态

static ManualResetEvent _mre = new ManualResetEvent(true);

执行结果

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当初始化为false时,为非终止状态

static ManualResetEvent _mre = new ManualResetEvent(false);

执行结果为

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这样我们就能看出来

终止状态时WaitOne()允许线程访问下边的语句

非终止状态时WaitOne()阻塞线程,不允许线程访问下边的语句

我们也可以把WaitOne()放在方法最下边

static void ThreadRun()
        {
            int _threadID = 0;
            while (true)
            {
               
                _threadID = Thread.CurrentThread.ManagedThreadId;
                Console.WriteLine("current Tread is " + _threadID);
                Thread.Sleep(TimeSpan.FromSeconds(2));
                _mre.WaitOne();
            }
        }

当初始化为true时执行结果和上边的一样会不停的执行

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初始化为false时执行到waitOne()时就阻塞线程不会再往下执行了

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接下来你可能就会想当在非终止状态时怎么让线程继续执行,怎么再让它停下来,这就要用了set()和Reset()方法了

把非终止状态改为终止状态用Set()方法

把终止状态改为非终止状态用Reset()方法

我用用代码来实现它们只要把我们上 边的代码做一下改动

class Program
    {
        static ManualResetEvent _mre = new ManualResetEvent(false);
        static void Main(string[] args)
        {
            Console.WriteLine("输入1为Set()   开始运行");
            Console.WriteLine("输入2为Reset() 暂停运行");
            Thread[] _threads = new Thread[3];
            for (int i = 0; i < _threads.Count(); i++)
            {
                _threads[i] = new Thread(ThreadRun);
                _threads[i].Start();
            }
            while (true)
            {
                switch (Console.ReadLine())
                {
                    case "1":
                        _mre.Set();
                        Console.WriteLine("开始运行");
                        break;
                    case "2":
                        _mre.Reset();
                        Console.WriteLine("暂停运行");
                        break;
                    default:
                        break;
                }
            }
          
        }
 
        static void ThreadRun()
        {
            int _threadID = 0;
            while (true)
            {
               
                _threadID = Thread.CurrentThread.ManagedThreadId;
                Console.WriteLine("current Tread is " + _threadID);
                Thread.Sleep(TimeSpan.FromSeconds(2));
                _mre.WaitOne();
            }
        }
    }

 

 

当输入1 时会调用 Set()方法 ManualResetEvent 处于终止状态会WaitOne不会阻塞线程会一直运行下去

当输入2时会调用 Reser()方法ManualResetEvent处于非终止状态WaitOne会阻塞线程直到再调用 Set()方法

看一下执行结果吧

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WaitOne return immediately.‘ data-guid="0f3ec962878650f739145cdfe51b8ea1">代码:ManualResetEventDemo.rar

详解 ManualResetEvent,布布扣,bubuko.com

详解 ManualResetEvent

原文:http://www.cnblogs.com/armyfai/p/3747102.html

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