libevent基础知识

在线手册

• 官方手册：http://www.wangafu.net/~nickm/libevent-book/

• 官方下载：http://sourceforge.net/projects/levent/files/libevent/

• 在线手册：http://www.monkey.org/~provos/libevent/doxygen-2.0.1/index.html

　　　　　 http://www.wangafu.net/~nickm/libevent-2.0/doxygen/html/index.html

• 百度百科：http://baike.baidu.com/link?url=cAxwbS2-agM4LSIYDQS1tAFxYrkLjju-6gcARq2iG6keI6MP6_WZpPCvZWKgAJbFnHNL40u5yYz6qhb71RQg4K

• 维基百科：https://en.wikipedia.org/wiki/Libevent

编译和安装（Linux : CentOS 7.0）

▶ 下载并解压libevent压缩包

▶ chmod 777 ./configure

▶ ./configure -prefix=/usr

▶ make

▶ make install

▶ 检测libevent是否安装成功：ls -al /usr/lib | grep libevent

测试示例

1. 获取版本信息

// test.cpp
#include <stdio.h>
#include <event.h>

int main(int argc, char ** argv)
{
    const char *cszVersion = event_get_version();
    printf("Version : %s\n", cszVersion);
    return 0;
}

g++ -o test.o -c test.cpp

g++ -levent -o test test.o

2. 简单触发器

// test.cpp
#include <stdio.h>
#include <event.h>
#include <iostream>

void OnTime(evutil_socket_t fd, short event, void *arg)
{
    std::cout << "OnTime Triggers!" << std::endl;

    struct timeval tv;
    tv.tv_sec  = 1;
    tv.tv_usec = 0;

    event_add((struct event*)arg, &tv);
}

int main(int argc, char ** argv)
{
    struct timeval tv;
    struct event   evTime;

    tv.tv_sec  = 1;
    tv.tv_usec = 0;

    event_init();
    evtimer_set(&evTime, OnTime, &evTime);
    event_add(&evTime, &tv);
    event_dispatch();

    return 0;
}