##占位

#include <windows.h>
#include <iostream>

int tickets = 100;
HANDLE hMutex;

DWORD WINAPI FunProc1(LPVOID param)
{
    while (TRUE)
    {
        WaitForSingleObject(hMutex, INFINITE);
        if (tickets > 0)
        {
            std::cout << "thread1 sell ticket:
 
" << tickets-- << std::endl;
        }
        else
            break;
        ReleaseMutex(hMutex);
    }
    return 0;
}
DWORD WINAPI FunProc2(LPVOID param)
{
    while (TRUE)
    {
        WaitForSingleObject(hMutex, INFINITE);
        if (tickets > 0)
        {
            std::cout 
 
<< "thread2 sell ticket:" << tickets-- << std::endl;
        }
        else
            break;
        ReleaseMutex(hMutex);
    }
    return 0;
}

int main()
{
    HANDLE hThread1, hThread2;
    hMutex = CreateMutex(NULL, FALSE, NULL);//創建互斥體的線程（也就是此主線程）不擁有
    //互斥對象，操作系統會將計數置為0，設為有信號狀態。
 

    hThread1 = CreateThread(NULL, 0, FunProc1, NULL, 0, NULL);
    hThread2 = CreateThread(NULL, 0, FunProc2, NULL, 0, NULL);
    CloseHandle(hThread1);
    CloseHandle(hThread2);
    Sleep(4000);
}

火車票線程同步（一）互斥體實現