libevent将使用IOCP设置的问题

[小鸟向前飞]

libevent使用IOCP，但是访问没有相应了。对比了libevent的bench_http.c的例子，没看出有什么差别。
请高手指点一下。

代码如下：

void GenCB(struct evhttp_request* req, void* args);

int _tmain(int argc, _TCHAR* argv[])
{
	WSADATA wsaData;
	if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
	{
		assert(false);
		return -1;
	}

	short http_port = 8081;
	char* http_addr = "127.0.0.1";

	evthread_use_windows_threads();

	struct event_config* cfg = event_config_new();
	event_config_set_flag(cfg, EVENT_BASE_FLAG_STARTUP_IOCP);

	//struct event_base * base = event_base_new();
	struct event_base* base = event_base_new_with_config(cfg);

	struct evhttp * http_server = evhttp_new(base);
	if (!http_server)
	{
		return -1;
	}

	int ret = evhttp_bind_socket(http_server, http_addr, http_port);
	if (ret != 0)
	{
		return -1;
	}

	evhttp_set_gencb(http_server, GenCB, NULL);

	printf("http server start OK! \n");

	event_base_dispatch(base);

	evhttp_free(http_server);

	WSACleanup();

	return 0;
}


void GenCB(struct evhttp_request* req, void* args)
{
	struct evbuffer *buf = evbuffer_new();

	evbuffer_add_printf(buf, "Server Responsed. Requested: %s\n", evhttp_request_get_uri(req));
	evhttp_send_reply(req, HTTP_OK, "OK", buf);

	evbuffer_free(buf);
}