libev的用法

本例是以linux环境c++的用法,ide用的是vs2019

一、libev的安装

我们采用的是apt-get方法（偷懒^_^），你也可以采用源码方式安装　

sudo apt-get install libev-dev

二、vs 2019的库引入

我们在这里引入libev,curl和glib库,对就命令编译的格式为

g++ main.cpp -o main -lev -lcurl -lglib-2.0 -L/usr/include/glib-2.0 -L/usr/lib/aarch64-linux-gnu/glib-2.0/include/

三、使用说明

1.引入ev.h

2.初始化libev

struct ev_loop* loop;
loop = EV_DEFAULT;

3.添加监听

io监听

/**读取监听**/
ev_io_init(&socket_read_watcher, socket_read_action, fd, EV_READ);
ev_io_start(loop, &socket_read_watcher);

信号中断监听

/**系统信号监听**/
ev_signal_init(&signal_watcher, signal_action, SIGINT);
ev_signal_start(loop, &signal_watcher);

定时任务

/**心跳监听部分start**/
ev_timer_init(&socket_time_heart_watcher, socket_heart_watcher, 5.5, 0.);
ev_timer_start(loop, &socket_time_heart_watcher);

启动监听

ev_run(loop, 0);

四、示例Demo

#include <cstdio>
#include <iostream>
#include <time.h>
#include <unistd.h>

#include <ev.h>

#include "main.h"

using namespace std;

/**
定时监听
*/
ev_timer socket_time_heart_watcher;

/**
socket监听
*/
ev_io socket_read_watcher;

/**
信号
*/
ev_signal signal_watcher;

struct ev_loop* loop;

/*************************************************
 Function:       // 信号监听
 Description:    // 信号监听
 @main_loop      //libev
 *************************************************/
void signal_action(struct ev_loop* main_loop, ev_signal* signal_w, int e)
{
	cout << "In Signal action" << endl;
}

/*************************************************
 Function:       // SOCKET读监听
 Description:    // 读监听
 @main_loop      //libev
 *************************************************/
void socket_read_action(EV_P_ ev_io* w, int revents)
{
	try
	{

	}
	catch (...)
	{

	}
}

/*************************************************
 Function:       // SOCKET心跳
 Description:    // 心跳
 @main_loop      //libev
 *************************************************/
void socket_heart_watcher(EV_P_ ev_timer* timer, int revents)
{
	try
	{
		cout << "i'm heart " << endl;

	}
	catch (...)
	{

	}

	timer->repeat = 5.0;

	ev_timer_again(loop, timer);
}

int main(int argc, char* argv[])
{
	cout << "start!.....\n" << endl;

	int i = 0;

	loop = EV_DEFAULT;

	/**网络读取监听**/
	ev_io_init(&socket_read_watcher, socket_read_action, 0, EV_READ);
	ev_io_start(loop, &socket_read_watcher);

	/**系统信号监听**/
	ev_signal_init(&signal_watcher, signal_action, SIGINT);
	ev_signal_start(loop, &signal_watcher);

	/**心跳监听部分start**/
	ev_timer_init(&socket_time_heart_watcher, socket_heart_watcher, 5.5, 0.);
	ev_timer_start(loop, &socket_time_heart_watcher);

	ev_run(loop, 0);
	return 0;
}