完成端口取消已投递的IO操作的问题

lsgt 2009-10-20 10:38:54

先描述，后代码。
先投递一个ConnectEx（不带数据），在PENDING时，如果在投递操作的线程里closesocket，能够立刻返回。如果在GQCS的线程里closesocket，GQCS不会返回，知道20秒之后返回，错误码121.
在ConnectEx连接上后，在GQCS里投递一个WSARecv(服务器不返回任何数据），则不论在GQCS线程或者单独线程里closesocket，GQCS都不返回。
以上情况加不加shutdown都一样。
我还试过不用closesocket,用PostQueuedCompletionStatus，GQCS是返回了，但随后用closesocket释放资源，后面GQCS还会再返回一次。
连接上之后用国SO_UPDATE_CONNECT_CONTEXT也一样。

下面是代码：



#include <winsock2.h>

#include <mswsock.h>

#include <process.h>

#include <stdio.h>

#pragma comment(lib,"ws2_32.lib")

#pragma comment(lib,"mswsock.lib")

struct IODATA

{

	OVERLAPPED ol;

	DWORD op;

	SOCKET s;

	HANDLE hIocp;

};

int main(int argc, char* argv[])

{

	int ret=0;

	DWORD bytes=0;

	WSADATA data={0};

	static LPFN_CONNECTEX lpfnConnectEx=NULL;

	int iRet=WSAStartup(0x0202,&data);



	HANDLE hIocp=CreateIoCompletionPort(INVALID_HANDLE_VALUE,NULL,0,0);

	IODATA io={0};

	io.s=socket(AF_INET,SOCK_STREAM,0);

	io.op=FD_CONNECT;

	io.hIocp=hIocp;

	CreateIoCompletionPort((HANDLE)io.s,hIocp,(ULONG_PTR)&io,0);



	SOCKADDR_IN lAddr,rAddr;

	lAddr.sin_family=AF_INET;

	lAddr.sin_port=INADDR_ANY;

	DWORD dwAddr=inet_addr("172.18.12.166");

	memcpy((char*)&(lAddr.sin_addr),&dwAddr,sizeof(dwAddr));



	rAddr.sin_family=AF_INET;

	rAddr.sin_port=htons(80);

	dwAddr=inet_addr("172.19.50.5");

	memcpy((char*)&(rAddr.sin_addr),&dwAddr,sizeof(dwAddr));



	ret=bind(io.s,(SOCKADDR*)&lAddr,sizeof(lAddr));



	if(NULL==lpfnConnectEx)

	{

		GUID guid=WSAID_CONNECTEX;

		ret=WSAIoctl(io.s,SIO_GET_EXTENSION_FUNCTION_POINTER,&guid,sizeof(guid),&lpfnConnectEx,sizeof(lpfnConnectEx),&bytes,NULL,NULL);

	}



//	_beginthreadex(NULL,0,_IoHandle,&io,0,NULL);  



	printf("connecting...\n");

	ret=lpfnConnectEx(io.s,(SOCKADDR*)&rAddr,sizeof(rAddr),NULL,0,&bytes,&io.ol);



	DWORD dwTick=GetTickCount();

	while(1)

	{

		IODATA* pio=NULL;

		LPOVERLAPPED pol=NULL;

		ret=GetQueuedCompletionStatus(hIocp,&bytes,(PULONG_PTR)&pio,&pol,1000);

		printf("GQCS returned  ---  ");

		if(!pio)

		{

			printf("GQCS timeout.closesocket[socket=%d] -%d\n",io.s,GetTickCount()-dwTick);

			if(ret==0)

			{

				shutdown(io.s,SD_BOTH);

				closesocket(io.s);				}

		}

		else

		{

			if(pio->op==FD_CONNECT)

			{

				if(ret)

				{

					printf("connect OK, recving[socket=%d]...\n",pio->s);

					WSABUF wb;

					wb.buf=new char[4096];

					wb.len=4096;

					pio->op=FD_READ;

					ret=WSARecv(pio->s,&wb,1,&bytes,0,&pio->ol,NULL);

					continue;

				}

				else

				{

					printf("%s[%d] failed %d\n",pio->op==FD_CONNECT ? "Connect" : "Recv",pio->s,WSAGetLastError());

					break;

				}

			}

			if(pio->op=FD_READ)

			{

				printf("printf returned[%d]\n",bytes);

				continue;

			}

		}

	}



	system("pause");

         return 0;

}