IOCP一小例

完成端口模型可以让我们基于传递overlapped数据的思想分解异步操作，让操作系统帮我们做线程间的数据传递。基于这个思想，可以把bsdsocket改造成异步模型，尽管这样做效率上意义不大，但对于想模拟ms完成端口都网络模型的人来说，可以小圆梦想了。

static  HANDLE  g_hiocp;



static      DWORD   WINAPI  worker(LPVOID pvd);



static  const   int BUF_LEN = 256;

struct myPerIoData

{

    OVERLAPPED  ov;

    char        bf[BUF_LEN];

};



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

{

    g_hiocp = CreateIoCompletionPort(INVALID_HANDLE_VALUE,NULL,NULL,0);



    CreateThread(NULL,0,worker,NULL,0,NULL);



    BOOL    bgqcs;

    DWORD   transed;

    DWORD   comkey;

    myPerIoData*    pov;

    int     cnt = 0;

    while (true)

    {

        transed = 0;

        pov     = NULL;

        bgqcs   = GetQueuedCompletionStatus(g_hiocp,&transed,&comkey,(LPOVERLAPPED*)&pov,INFINITE);

        if (NULL == pov)

        {

            printf("sorry,you lost your snake/n");

            break;

        }

        printf("%s/n",pov->bf);

        delete  pov;

    }

    return 0;

}



DWORD   WINAPI worker( LPVOID pvd )

{

    int cnt = 0;

    while (true)

    {

        Sleep(3000);

        ++cnt;

        if (cnt <= 5)

        {

            myPerIoData*    pov = new myPerIoData;

            memset(pov,0,sizeof(myPerIoData));

            sprintf_s(pov->bf,BUF_LEN,"yes,it's snake : %d",cnt);

            PostQueuedCompletionStatus(g_hiocp,0,NULL,&pov->ov);

        }

        else

        {

            PostQueuedCompletionStatus(g_hiocp,0,NULL,NULL);

        }

    }

    return  0L;

}

static	HANDLE	g_hiocp;



static		DWORD	WINAPI	worker(LPVOID pvd);



static	const	int	BUF_LEN	= 256;

struct myPerIoData

{

	OVERLAPPED	ov;

	char		bf[BUF_LEN];

};



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

{

	g_hiocp	= CreateIoCompletionPort(INVALID_HANDLE_VALUE,NULL,NULL,0);



	CreateThread(NULL,0,worker,NULL,0,NULL);



	BOOL	bgqcs;

	DWORD	transed;

	DWORD	comkey;

	myPerIoData*	pov;

	int		cnt	= 0;

	while (true)

	{

		transed	= 0;

		pov		= NULL;

		bgqcs	= GetQueuedCompletionStatus(g_hiocp,&transed,&comkey,(LPOVERLAPPED*)&pov,INFINITE);

		if (NULL == pov)

		{

			printf("sorry,you lost your snake/n");

			break;

		}

		printf("%s/n",pov->bf);

		delete	pov;

	}

	return 0;

}



DWORD	WINAPI worker( LPVOID pvd )

{

	int	cnt	= 0;

	while (true)

	{

		Sleep(3000);

		++cnt;

		if (cnt <= 5)

		{

			myPerIoData*	pov	= new myPerIoData;

			memset(pov,0,sizeof(myPerIoData));

			sprintf_s(pov->bf,BUF_LEN,"yes,it's snake : %d",cnt);

			PostQueuedCompletionStatus(g_hiocp,0,NULL,&pov->ov);

		}

		else

		{

			PostQueuedCompletionStatus(g_hiocp,0,NULL,NULL);

		}

	}

	return	0L;

}

　　程序输出是这样的：

yes,it's snake:1

yes,it's snake:2

yes,it's snake:3

yes,it's snake:4

yes,it's snake:5

sorry,you lost your snake