模拟订票系统学习多线程

#include <windows.h>
#include <IOSTREAM.H>

//线程函数声明
DWORD WINAPI FuncProc1(    LPVOID lpParameter//thread data
);
DWORD WINAPI FuncProc2(    LPVOID lpParameter//thread data
);

//int index = 0;
int tickets = 100;
HANDLE hMutex; //互斥对象

int main()
{
    HANDLE hThread1;
    HANDLE hThread2;
    hThread1 = CreateThread(NULL,//pointer to security attributes
        0,                         //initial thread stack size
        FuncProc1,                 // pointer to thread function
        NULL,                     // argument for new thread
        0,                         // creation flags
        NULL);                     // pointer to receive thread ID

    hThread2 = CreateThread(NULL,
        0,
        FuncProc2,
        NULL,
        0,
        NULL);

    CloseHandle(hThread1);
    CloseHandle(hThread2);
    /*while (index++ < 1000)
    {
        cout << "main thread is running" << endl;
    }*/    

    hMutex = CreateMutex(NULL,// pointer to security attributes
        TRUE,                  // flag for initial ownership
        "tickets"                  // pointer to mutex-object name
        );

    //可以利用上用"tickets"命名来判断只能运行一个实例
    if (hMutex)
    {
        if (ERROR_ALREADY_EXISTS == GetLastError())
        {
            cout << "Only one instance can run!" << endl;
            return 0;
        }
    }
    
    /* 这个地方线程互斥量已在主线程中，执行下面该语句名互斥量变为2，
    则下面ReleaseMutex函数需要执行两次才能完全释放，让子线程去执行*/
    WaitForSingleObject(hMutex,INFINITE);
    ReleaseMutex(hMutex);//此处需要释放主线程创建时得到的互斥量，否则子线程不执行
    ReleaseMutex(hMutex);//
    Sleep(4000);
    
    return 0 ;
}

//线程函数定义
DWORD WINAPI FuncProc1(LPVOID lpParameter //thread data
                       )
{
    /*while(index++ < 1000)
    {
        cout << "thread1 is running" << endl;
    }*/

    while(TRUE)
    {
        //ReleaseMutex(hMutex);
        WaitForSingleObject(hMutex,//handle to object to wait for
            INFINITE               //time-out interval in milliseconds:INFINITE, the function's time-out interval never elapses. 
            );
        if (tickets>0)
        {
            Sleep(10);
            cout << "Thread1 sell tickets: " << tickets-- << endl;
        }
        else
        {
            break;
        }
        ReleaseMutex(hMutex);
    }

    return 0;
};

DWORD WINAPI FuncProc2(    LPVOID lpParameter//thread data
)
{
    while(TRUE)
    {
        //ReleaseMutex(hMutex);
        WaitForSingleObject(hMutex,INFINITE);
        if (tickets>0)
        {
            Sleep(10);
            cout << "Thread2 sell tickets: " << tickets-- << endl;
        }
        else
        {
            break;
        }
        ReleaseMutex(hMutex);
    }

    return 0;
}