c# 多线程 --Mutex（互斥锁）

2010-09-01 14:17 田志良阅读(14295) 评论(2) 编辑收藏举报

互斥锁（Mutex）

互斥锁是一个互斥的同步对象，意味着同一时间有且仅有一个线程可以获取它。

互斥锁可适用于一个共享资源每次只能被一个线程访问的情况

函数：

//创建一个处于未获取状态的互斥锁

Public Mutex（）；

//如果owned为true，互斥锁的初始状态就是被主线程所获取，否则处于未获取状态

Public Mutex（bool owned）；

如果要获取一个互斥锁。应调用互斥锁上的WaitOne()方法，该方法继承于Thread.WaitHandle类

它处于等到状态直至所调用互斥锁可以被获取，因此该方法将组织住主调线程直到指定的互斥锁可用，如果不需要拥有互斥锁，用ReleaseMutex方法释放，从而使互斥锁可以被另外一个线程所获取。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
using System.Threading;
 
namespace MyTTCon
{
    class shareRes
    {
        public static int count = 0;
        public static Mutex mutex = new Mutex();
    }
 
    class IncThread
    {
        int number;
        public Thread thrd;
        public IncThread(string name, int n)
        {
            thrd = new Thread(this.run);
            number = n;
            thrd.Name = name;
            thrd.Start();
        }
        void run()
        {
            Console.WriteLine(thrd.Name + "正在等待 the mutex");
            //申请
            shareRes.mutex.WaitOne();
            Console.WriteLine(thrd.Name + "申请到 the mutex");
            do
            {
                Thread.Sleep(1000);
                shareRes.count++;
                Console.WriteLine("In " + thrd.Name + "ShareRes.count is " + shareRes.count);
                number--;
            } while (number > 0);
            Console.WriteLine(thrd.Name + "释放 the nmutex");
            //  释放
            shareRes.mutex.ReleaseMutex();
        }
    }
    class DecThread
    {
        int number;
        public Thread thrd;
        public DecThread(string name, int n)
        {
            thrd = new Thread(this.run);
            number = n;
            thrd.Name = name;
            thrd.Start();
        }
        void run()
        {
            Console.WriteLine(thrd.Name + "正在等待 the mutex");
            //申请
            shareRes.mutex.WaitOne();
            Console.WriteLine(thrd.Name + "申请到 the mutex");
            do
            {
                Thread.Sleep(1000);
                shareRes.count--;
                Console.WriteLine("In " + thrd.Name + "ShareRes.count is " + shareRes.count);
                number--;
            } while (number > 0);
            Console.WriteLine(thrd.Name + "释放 the nmutex");
            //  释放
            shareRes.mutex.ReleaseMutex();
        }
    }
 
    class Program
    {
        static void Main(string[] args)
        {
            IncThread mthrd1 = new IncThread("IncThread thread ", 5);
            DecThread mthrd2 = new DecThread("DecThread thread ", 5);
            mthrd1.thrd.Join();
            mthrd2.thrd.Join();
        }
    }
}