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上传文件至 'test_loop'

事件循环demo
master
adminPyf 3 years ago
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commit
9f2645cffe
2 changed files with 86 additions and 0 deletions
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      test_loop/makefile
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      test_loop/test_loop.cpp

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test_loop/makefile View File

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test_loop:test_loop.cpp
g++ $^ -o $@ -levent

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test_loop/test_loop.cpp View File

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#include <iostream>
#include <event2/event.h>
#include <signal.h>
using namespace std;
bool isexit = false;
//sock 文件描述符 which 事件类型 arg传递的参数
static void Ctrl_C(int sock,short which , void* arg){
cout << "Ctrl_C" << endl;
event_base * base = (event_base *)arg;
//执行完当前事件函数退出
//event_base_loopbreak(base);
//运行完所有的活动事件在退出,事件循环没有运行时,也要等运行一次在退出
timeval t= {3,0}; //至少运行3s退出
event_base_loopexit(base,&t);
}
static void Kill(int sock,short which , void* arg){
cout << "Kill" << endl;
event *ev = (event*)arg;
//如果处于非待决
if(!evsignal_pending(ev,NULL)){
event_del(ev);
event_add(ev,NULL); //再次添加进来
}
}
int main(int agrc,char** agrv){
event_base *base = event_base_new();
//添加信号 ctrl+c ,处于no pending 状态
//evsignal_new 隐藏的状态 EV_SIGNAL|EV_PERSIST
event *csig = evsignal_new(base,SIGINT,Ctrl_C,base);
if(!csig){
cerr << "SIGNAL evsignal_new failed!" << endl;
return -1;
}
if (event_add(csig,0) != 0){
cerr << "SIGANL event_add failed" << endl;
}
//添加kill信号
//非持久事件,只进入一次 event_self_cbarg()传递当前的event
event *ksig = event_new(base,SIGTERM,EV_SIGNAL,Kill,
event_self_cbarg());
if(!ksig){
cerr << "SIGNAL evsignal_new failed!" << endl;
return -1;
}
if (event_add(ksig,0) != 0){
cerr << "SIGANL event_add failed" << endl;
}
//进入事件主循环
//event_base_dispatch(base);
//EVLOOP_ONCE 等待一个事件运行,直到没有活动事件就退出
//EVLOOP_NONBLOCK 有活动事件就处理,没有就返回0
//event_base_loop(base,EVLOOP_NONBLOCK);
// while (isexit)
// {
// event_base_loop(base,EVLOOP_NONBLOCK);
// }
//没有注册事件也不返回,用于事件后期多线程添加
event_base_loop(base,EVLOOP_NO_EXIT_ON_EMPTY);
event_free(csig);
event_base_free(base);
return 0;
}

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