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c# 多线程 --Mutex(互斥锁) 【转】

2019年04月04日  | 移动技术网IT编程  | 我要评论

契约王妃 潇烟漠漠,猪八戒威客网,济南二手车

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。

 

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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();
        }
    }
}

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