From 9f2645cffe0dee257468a088c0a996ff6844365c Mon Sep 17 00:00:00 2001
From: adminPyf <3043130461@qq.com>
Date: Sun, 13 Jun 2021 12:37:02 +0800
Subject: [PATCH] =?UTF-8?q?=E4=B8=8A=E4=BC=A0=E6=96=87=E4=BB=B6=E8=87=B3?=
 =?UTF-8?q?=20'test=5Floop'?=
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事件循环demo
---
 test_loop/makefile      |  2 +
 test_loop/test_loop.cpp | 84 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 86 insertions(+)
 create mode 100644 test_loop/makefile
 create mode 100644 test_loop/test_loop.cpp

diff --git a/test_loop/makefile b/test_loop/makefile
new file mode 100644
index 0000000..0a68368
--- /dev/null
+++ b/test_loop/makefile
@@ -0,0 +1,2 @@
+test_loop:test_loop.cpp
+	g++ $^ -o $@ -levent
\ No newline at end of file
diff --git a/test_loop/test_loop.cpp b/test_loop/test_loop.cpp
new file mode 100644
index 0000000..b26a870
--- /dev/null
+++ b/test_loop/test_loop.cpp
@@ -0,0 +1,84 @@
+#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;
+
+}
\ No newline at end of file