windows下多线程互斥量控制简单例子

 //在ReleaseMutex（）之前sleep()，sleep（）也会释放互斥量。

//这是2个线程模拟卖火车票的小程序
#include <windows.h>
#include <iostream.h>

DWORD WINAPI Fun1Proc(LPVOID lpParameter);//thread data
DWORD WINAPI Fun2Proc(LPVOID lpParameter);//thread data

int index=0;
int tickets=10;
HANDLE hMutex;
int main()
{
    HANDLE hThread1;
    HANDLE hThread2;
  
 
    //创建互斥对象
    hMutex=CreateMutex(NULL,TRUE,"tickets");//TRUE 表示当前线程拥有该互斥量，等下要先释放 tickets为互斥量名称
    if (hMutex)
    {
        if (ERROR_ALREADY_EXISTS==GetLastError())
        {
            cout<<"only one instance can run!"<<endl;
            return 0;
        }
    }
     //创建线程

    hThread1=CreateThread(NULL,0,Fun1Proc,NULL,0,NULL);
    hThread2=CreateThread(NULL,0,Fun2Proc,NULL,0,NULL);
   
    CloseHandle(hThread1);  
    CloseHandle(hThread2);
    ReleaseMutex(hMutex); //先释放互斥量，因为已经拥有该释放量。 
    Sleep(4000);

    WaitForSingleObject(hMutex,INIFITE);//确保子线程退出才结束main

    ReleaseMutex(hMutex);

    CloseHandle(hMutex);
    cout<<"now is the main thread in running\n";
    system("pause");
    return 0;
}
//线程1的入口函数
DWORD WINAPI Fun1Proc(LPVOID lpParameter)//thread data
{
    while (true)
    {
       
        WaitForSingleObject(hMutex,INFINITE);
        if (tickets>0)
        {
         //cout<<"thread1 is in the region"<<endl;
            Sleep(1);//会释放互斥量hMutex
            cout<<"thread1 sell ticket :"<<tickets--<<endl;
        }
        else
            break;
        ReleaseMutex(hMutex);
    }
 
    return 0;
}
//线程2的入口函数
DWORD WINAPI Fun2Proc(LPVOID lpParameter)//thread data
{
    while (true)
    {
     
        WaitForSingleObject(hMutex,INFINITE);
        if (tickets>0)
        {
            Sleep(1);
            cout<<"thread2 sell ticket :"<<tickets--<<endl;
        }
        else
            break;
        ReleaseMutex(hMutex);
    }
   
    return 0;
}