libevent_study/test_timer/test_timer.cpp

#include <iostream>
#include <event2/event.h>
#include <string.h>
#include <thread>
#ifdef _WIN32
	
#else
	#include <signal.h>
#endif // !_WIN32

using namespace std;
static timeval t1 = {1,0};
void timer1(int sock,short which, void *arg){
    cout << "[timer1]" <<    flush;
    event* ev = (event*)arg;
    if(!evtimer_pending(ev,&t1) ){
        evtimer_del(ev);
        evtimer_add(ev,&t1);
    }
}

void timer2(int sock,short which, void *arg){
    cout << "[timer2]" <<    flush;
    this_thread::sleep_for(3000ms); //c++ 11
}
void timer3(int sock,short which, void *arg){
    cout << "[timer3]" <<    flush;
}

int main(int agrc,char** agrv){
#ifdef _WIN32
	//初始化socket库
	WSADATA wsa;
	WSAStartup(MAKEWORD(2, 2), &wsa);
#else 
	if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) { //忽略管道信号，发送数据给已关闭的socket，会飞掉！
		return 1;
	}
#endif

    event_base *base = event_base_new();

    //定时器
    cout << "test timer" << endl;

    //非持久定时器 只进入一次
    event* evl = evtimer_new(base ,timer1,event_self_cbarg());
    if(evl == NULL){
        cout << "evtimer_new timer1 failed!" <<endl;
        return -1;
    }
    evtimer_add(evl,&t1);


    static timeval t2;
    t2.tv_sec = 1;
    t2.tv_usec = 200000; //微秒
    event *ev2 = event_new(base,-1,EV_PERSIST,timer2,0);
    event_add(ev2,&t2);


    //超时性能优化，默认event用二叉堆存储，插入删除 时间复杂度为O(logN)
    //优化到双向队列 插入删除O(1)
    event *ev3 = event_new(base,-1,EV_PERSIST,timer3,0);
    static timeval tv_in = {3,0};
    const timeval * t3;
    t3 = event_base_init_common_timeout(base,&tv_in);
    event_add(ev3,t3);
    
    //进入事件主循环
    event_base_dispatch(base);

    event_free(evl);
    event_free(ev2);

    event_base_free(base);
   
    return 0;

}