thread 利用event顺序同步 (windows )

 

 

 

// MultiThreadTest.cpp : Defines the entry point for the console application.
//

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

HANDLE g_hEvent;
HANDLE g_hEvent1;
HANDLE g_hEvent2;
HANDLE g_hEvent3;

unsigned __stdcall WordCount(void *pvParam);
unsigned __stdcall SpellCheck(void *pvParam);
unsigned __stdcall GrammarCheck(void *pvParam);


int _tmain(int argc, _TCHAR* argv[])
{
g_hEvent1 = CreateEvent(NULL, FALSE, FALSE, NULL);
g_hEvent2 = CreateEvent(NULL, FALSE, FALSE, NULL);
g_hEvent3 = CreateEvent(NULL, FALSE, FALSE, NULL);

HANDLE hThread[3];


unsigned dwThreadID[3];



hThread[0] = (HANDLE)_beginthreadex(NULL, 0, WordCount, NULL, 0, &dwThreadID[0]);
hThread[1] = (HANDLE)_beginthreadex(NULL, 0, SpellCheck, NULL, 0, &dwThreadID[1]);
hThread[2] = (HANDLE)_beginthreadex(NULL, 0, GrammarCheck, NULL, 0, &dwThreadID[2]);

SetEvent(g_hEvent1);

DWORD dwCThd = WaitForMultipleObjects (3, //count of objects
                                        hThread, //thread handle
                                        TRUE, //wait for all
                                        INFINITE); //time out interval



printf("main thread exit\n");
return 0;
}

unsigned __stdcall WordCount(void *pvParam) 
{
　　int i =0;
　　while(i<5)
　　{
　　　　WaitForSingleObject(g_hEvent1, INFINITE);
　　　　ResetEvent(g_hEvent1);//lock
　　　　printf("enter func===1\n ");
　　　　SetEvent(g_hEvent2);//unlock
　　　　i++;
　　}
   return(0);
}
unsigned __stdcall SpellCheck(void *pvParam)
{
　　int i =0;
　　while(i<5)
　　{
　　　　WaitForSingleObject(g_hEvent2, INFINITE);
　　　　ResetEvent(g_hEvent2);
　　　　printf("enter func===2 \n");
　　　　SetEvent(g_hEvent3);
　　　　i++;
　　} 
  return(0);
}
unsigned __stdcall GrammarCheck(void *pvParam)
{
　　int i = 0;
　　while(i<5)
　　{
    　WaitForSingleObject(g_hEvent3, INFINITE);
　　　ResetEvent(g_hEvent3);
　　　printf("enter func===3 \n");
　　　SetEvent(g_hEvent1);
　　　i++;
　　}
　　return(0);
}

 

   参照如下地址，自己写了一遍，理解下event。

 

//http://blog.csdn.net/morewindows/article/details/7445233
//http://2309998.blog.51cto.com/2299998/1263928

#include<windows.h>
#include<iostream>
using namespace std;
#pragma argsused
//子线程事件
HANDLE  g_ThreadEvent[3];
int g_EventIndex = 0;
DWORD WINAPI ThreadFunc(void *p)
{
    int param=(int)p;
    char c='A'+param;
    for(int iIndex =0; iIndex < 10; iIndex ++)
    {
        //线程ABC分别等待事件0,1,2
        WaitForSingleObject(g_ThreadEvent[param], INFINITE);  printf("the thread is %c\n",c);
        
        ResetEvent(g_ThreadEvent[g_EventIndex]);// 重置 挂起 当前event ,Sets the specified event object to the nonsignaled state.https://msdn.microsoft.com/en-us/library/windows/desktop/ms685081%28v=vs.85%29.aspx

        g_EventIndex = (g_EventIndex+1)%3;
        SetEvent(g_ThreadEvent[g_EventIndex]);//通知  激活下一个 event, Sets the specified event object to the signaled state. https://msdn.microsoft.com/en-us/library/windows/desktop/ms686211%28v=vs.85%29.aspx
    }
    return 0;
}
int main(int argc, char* argv[])
{
    //全为自动模式一次只能进去一个
    for(int iIndex = 0; iIndex < 3; iIndex++)
    {
        g_ThreadEvent[iIndex] = CreateEvent(NULL, false, false, NULL);
    }
        SetEvent(g_ThreadEvent[0]);
        HANDLE hThread[3];
    for(int iIndex = 0; iIndex < 3; iIndex++)
    {
            hThread[iIndex] = (HANDLE)CreateThread(NULL, 0,ThreadFunc,     (void *)iIndex, 0, NULL);
     }
        //等待所有线程结束
        WaitForMultipleObjects(3, hThread, TRUE, INFINITE);   cout<<"运行结束，按任意键退出.....\n";
        char c= getchar();
        CloseHandle(g_ThreadEvent);
        return 0;
    }
}        

 

 

-------------------

后话20191010

c++ 11 thread 库,已经足够好,  推荐用c++ 内置thread,简单好用.  (API 设计真的是一门艺术)

https://zh.cppreference.com/w/cpp

 

Thread support library (C++11)    https://en.cppreference.com/w/cpp/thread