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。
Code
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();
}
}
}