libevent在windows中設置iocp和線程池

#include <event2/event.h>
#include <event2/thread.h>
#include<event2/listener.h>
#ifndef _WIN32
#include <signal.h>
#else
#endif
#include <iostream>
using namespace std;
#define SPORT 5001

void listen_cb(evconnlistener* ev, evutil_socket_t s, struct sockaddr* addr, int socklen, void* arg)
{
	cout << "lesson_cb" << endl;
}
int main()
{
#ifdef _WIN32 
	//初始化socket庫
	WSADATA wsa;
	int a =WSAStartup(MAKEWORD(2, 2), &wsa);
#else
	//忽略管道信號，發送數據給已關閉的socket
	if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
		return 1;
#endif


	//創建配置上下文
	event_config* conf = event_config_new();

	//顯示支持的網絡模式
	const char** methods = event_get_supported_methods();
	cout << "supported_methods:" << endl;
	for (int i = 0; methods[i] != NULL; i++)
	{
		cout << methods[i] << endl;
	}

	//設置特徵
	//設置了EV_FEATURE_FDS 其他特徵就無法設置，在windows中EV_FEATURE_FDS無效
	//event_config_require_features(conf, EV_FEATURE_ET| EV_FEATURE_FDS);
	//event_config_require_features(conf,EV_FEATURE_FDS); //不支持epoll

	//設置網絡模型，使用select
	//event_config_avoid_method(conf, "epoll");
	//event_config_avoid_method(conf, "poll");

	//windows中支持IOCP(線程池)
#ifdef _WIN32
	event_config_set_flag(conf, EVENT_BASE_FLAG_STARTUP_IOCP);
	//初始化iocp的線程
	evthread_use_windows_threads();
	//設置cpu數量
	SYSTEM_INFO si;
	GetSystemInfo(&si);
	event_config_set_num_cpus_hint(conf, si.dwNumberOfProcessors);
#endif


	//初始化配置libevent上下文
	event_base* base = event_base_new_with_config(conf);
	event_config_free(conf);


	if (!base)
	{
		cerr << "event_base_new_with_config failed!" << endl;
		base = event_base_new();
		if (!base)
		{
			cerr << "event_base_new failed！" << endl;
			return 0;
		}
	}
	else
	{
		//獲取當前網絡模型
		cout << "current method is " << event_base_get_method(base) << endl;


		//確認特徵是否生效
		int f = event_base_get_features(base);
		if (f & EV_FEATURE_ET)
			cout << "EV_FEATURE_ET events are supported." << endl;
		else
			cout << "EV_FEATURE_ET events are not supported." << endl;
		if (f & EV_FEATURE_O1)
			cout << "EV_FEATURE_O1 events are supported." << endl;
		else
			cout << "EV_FEATURE_O1 events are not supported." << endl;
		if (f & EV_FEATURE_FDS)
			cout << "EV_FEATURE_FDS events are supported." << endl;
		else
			cout << "EV_FEATURE_FDS events are not supported." << endl;

		if (f & EV_FEATURE_EARLY_CLOSE)
			cout << "EV_FEATURE_EARLY_CLOSE events are supported." << endl;
		else
			cout << "EV_FEATURE_EARLY_CLOSE events are not supported." << endl;
		cout << "event_base_new_with_config success!" << endl;


		sockaddr_in sin;
		memset(&sin, 0, sizeof(sin));
		sin.sin_family = AF_INET;
		sin.sin_port = htons(SPORT);

		evconnlistener* ev = evconnlistener_new_bind(base, listen_cb, base, 10,
			LEV_OPT_CLOSE_ON_FREE | LEV_OPT_REUSEABLE,
			(sockaddr*)&sin, sizeof(sin));
		event_base_dispatch(base);
		evconnlistener_free(ev);
		event_base_free(base);
	}

	return 0;
}