事件线程同步

// wondows原理day002.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include<windows.h>


//3个全局事件对象句柄
HANDLE hEventA, hEventB, hEventC;


//线程A
DWORD WINAPI ThreadProc1(_In_ LPVOID lpParameter)
{
    for (int i = 0; i < 10; i++)
    {
        WaitForSingleObject(hEventA, -1);
        printf("A
");
        //关闭自己，打开下一个要打印的事件对象
        ResetEvent(hEventA);
        SetEvent(hEventB);
    }
    return 0;
}



//线程B
DWORD WINAPI ThreadProc2(_In_ LPVOID lpParameter)
{
    for (int i = 0; i < 10; i++)
    {
        WaitForSingleObject(hEventB, -1);
        printf("B
");
        //关闭自己，打开下一个要打印的事件对象
        ResetEvent(hEventB);
        SetEvent(hEventC);
    }
    return 0;
}



//线程C
DWORD WINAPI ThreadProc3(_In_ LPVOID lpParameter)
{
    for (int i = 0; i < 10; i++)
    {
        WaitForSingleObject(hEventC, -1);
        printf("C
");
        //关闭自己，打开下一个要打印的事件对象
        ResetEvent(hEventC);
        SetEvent(hEventA);
    }
    return 0;
}

int _tmain(int argc, _TCHAR* argv[])
{



    //创建3个事件对象
    hEventA = CreateEvent(NULL, TRUE, TRUE, L"A");
    hEventB = CreateEvent(NULL, TRUE, FALSE, L"B");
    hEventC = CreateEvent(NULL, TRUE, FALSE, L"C");



    //创建3个线程，分别实现打印A，B，C
    HANDLE hThread1 = CreateThread(NULL, NULL, ThreadProc1, NULL, NULL,NULL);
    HANDLE hThread2 = CreateThread(NULL, NULL, ThreadProc2, NULL, NULL, NULL);
    HANDLE hThread3 = CreateThread(NULL, NULL, ThreadProc3, NULL, NULL, NULL);



    //等待线程返回
    WaitForSingleObject(hThread1, -1);
    WaitForSingleObject(hThread2, -1);
    WaitForSingleObject(hThread3, -1);
    HANDLE arrHandle[] = { hThread1, hThread2, hThread3 };




    //也可以用下面的多对象等待
    //WaitForMultipleObjects(3,arrHandle,TRUE,INFINITE)

    system("pause");
    return 0;
}