多线程之信号量（By C++）

#include<Windows.h>
#include<iostream>
using namespace std;
//创建一个信号量
HANDLE hSemaphore;

//有参数
DWORD WINAPI MyThread2(LPVOID lpParamter)
{
    while (1)
    {
        WaitForSingleObject(hSemaphore,INFINITE);
        cout << "MyThread1 Runing :"<<"线程2" << endl;
        Sleep(2000);
        ReleaseSemaphore(hSemaphore,1,NULL);//释放信号量 

    }
}
//无参数
DWORD WINAPI MyThread1(LPVOID lpParamter)
{
    while (1)
    {
        //信号量减1，如果等于0就进入睡眠，待大于0之后再减
        WaitForSingleObject(hSemaphore,INFINITE);
        cout << "MyThread2 Runing"<<"线程1" << endl;
        Sleep(2000);
        //信号量加1
        ReleaseSemaphore(hSemaphore,1,NULL);//释放信号量 
    }
}
//无参数
DWORD WINAPI MyThread3(LPVOID lpParamter)
{
    while (1)
    {
        //信号量减1，如果等于0就进入睡眠，待大于0之后再减
        WaitForSingleObject(hSemaphore,INFINITE);
        cout << "MyThread2 Runing"<<"线程3" << endl;
        Sleep(2000);
        //释放信号量,信号量加1
        ReleaseSemaphore(hSemaphore,2,NULL);
    }
}

int main()
{

    //创建一个信号量，2是初值，3是最大值
    hSemaphore  =CreateSemaphore(NULL,2,3,NULL);

    //第三个参数是线程函数的地址，第四个参数是传到线程的参数指针
    HANDLE hThread = CreateThread(NULL, 0, MyThread1, NULL, 0, NULL);
    //释放句柄
    CloseHandle(hThread);

    HANDLE hThread1 = CreateThread(NULL, 0, MyThread2, NULL, 0, NULL);
    CloseHandle(hThread);

    HANDLE hThread3 = CreateThread(NULL, 0, MyThread3, NULL, 0, NULL);
    //释放句柄
    CloseHandle(hThread3);
    while(1);
    return 0;
}