libevent的线程优雅的退出方式

关键代码时：

        主要是主线程必须等待子线程退出才可以

测试代码

#include "RecvData.h"

static struct event_base *base;
static struct evconnlistener *listener;
static struct event *signal_event;
static  std::shared_ptr<std::thread> work_thread;


static void listener_cb(struct evconnlistener *, evutil_socket_t,
struct sockaddr *, int socklen, void *);
static void conn_writecb(struct bufferevent *, void *);
static void conn_eventcb(struct bufferevent *, short, void *);
static void signal_cb(evutil_socket_t, short, void *);
static void read_cb(struct bufferevent *bev, void *ctx);


static void listener_cb(struct evconnlistener *listener, evutil_socket_t fd,
struct sockaddr *sa, int socklen, void *user_data)
{
	struct event_base *base = (event_base *)user_data;
	struct bufferevent *bev;
	//struct evdns_base host;
	bev = bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE);
	if (!bev) {
		fprintf(stderr, "Error constructing bufferevent!");
		event_base_loopbreak(base);
		return;
	}
	char ip[32];
	int port=0;
	//bufferevent_socket_connect_hostname(bev, NULL, AF_INET, ip, port);

	bufferevent_setcb(bev, read_cb, conn_writecb, conn_eventcb, NULL);
	bufferevent_enable(bev, EV_WRITE | EV_READ);
	//bufferevent_disable(bev, EV_READ);

	//bufferevent_write(bev, MESSAGE, strlen(MESSAGE));
}

static void read_cb(struct bufferevent *bev, void *ctx)
{
	static int i = 0;
	static uint8_t buff[1024] = { 0 };
	memset(buff, 0, 1024);
	int len = bufferevent_read(bev, buff, 1024);
	bufferevent_write(bev, buff, len);
	printf("read:");
	for (int i = 0; i < len; i++)
	{
		
		printf("%x  ", buff[i]);
	}
	printf("\n");

}

static void conn_writecb(struct bufferevent *bev, void *user_data)
{
	//struct evbuffer *output = bufferevent_get_output(bev);
	//if (evbuffer_get_length(output) == 0) {
	//	printf("flushed answer\n");
	//	//bufferevent_free(bev);
	//}
	
}

static void conn_eventcb(struct bufferevent *bev, short events, void *user_data)
{
	if (events & BEV_EVENT_EOF) {
		printf("Connection closed.\n");
	}
	else if (events & BEV_EVENT_ERROR) {
		printf("Got an error on the connection: %s\n",errno);
	}

	bufferevent_free(bev);
}



static void signal_cb(evutil_socket_t sig, short events, void *user_data)
{
	struct timeval delay = { 2, 0 };

	printf("Caught an interrupt signal; exiting cleanly in two seconds.\n");
	evconnlistener_free(listener);
	event_free(signal_event);
	event_base_loopbreak(base);
	event_base_loopexit(base, &delay);
	event_base_free(base);
	
	
}


CRecvData::CRecvData()
{
}


CRecvData::~CRecvData()
{
	//优雅的退出关键
	work_thread->join();
}

uint8_t CRecvData::StartServer(uint16_t port/*=6001*/)
{
	

	struct sockaddr_in sin;
#ifdef _WIN32
	WSADATA wsa_data;
	WSAStartup(0x0201, &wsa_data);
#endif

	base = event_base_new();
	if (!base) {
		fprintf(stderr, "Could not initialize libevent!\n");
		return 1;
	}

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

	listener = evconnlistener_new_bind(base, listener_cb, (void *)base,
		LEV_OPT_REUSEABLE | LEV_OPT_CLOSE_ON_FREE, -1,
		(struct sockaddr*)&sin,
		sizeof(sin));

	if (!listener) {
		fprintf(stderr, "Could not create a listener!\n");
		return 1;
	}

	signal_event = evsignal_new(base, SIGINT, signal_cb, (void *)base);

	if (!signal_event || event_add(signal_event, NULL) < 0) {
		fprintf(stderr, "Could not create/add a signal event!\n");
		return 1;
	}
	work_thread = std::make_shared<std::thread>([](){
		event_base_dispatch(base);
	});
	return 0;
}

#pragma once
#include <cstdint>
#include <event2/bufferevent.h>
#include <event2/buffer.h>
#include <event2/listener.h>
#include <event2/util.h>
#include <event2/event.h>
#include <signal.h>
#include<thread>
#include <condition_variable>
#include <mutex>
#include <memory>
#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "wsock32.lib")
#pragma comment(lib, "libevent.lib")
#pragma comment(lib, "libevent_core.lib")
#pragma comment(lib, "libevent_extras.lib")

class CRecvData
{
public:
	
	
public:
	CRecvData();
	~CRecvData();
	uint8_t StartQSYServer(uint16_t port=6001);
	
};

#include "RecvData.h"
int main(int argc, char **argv)
{
	CRecvData recv;
	recv.StartQSYServer();
	getchar();
	return 0;
}