epoll.docx
《epoll.docx》由会员分享,可在线阅读,更多相关《epoll.docx(14页珍藏版)》请在冰豆网上搜索。
epoll
在ACE中有一个TP_Reactor是基于select的..就是可以多线程轮循select
1.线程1用select去轮循fd_set,结束后.获得可读的所有句柄.然后将这些句柄从集合中删掉.然后去操作这些可读句柄
2.线程2用select去轮循fd_set(不包含刚才已经可读的句柄).
3......
因为select是每次循环都要重新加载fd_set.所以可以这样实现多线程轮循.
但epoll的话是一次性的,如果将每次可读的fd都调用EPOLL_CTL_DEL将其从events队列中行色匆除.我觉得可能得不到预期的高效.因为使用epoll的环境毕竟是fd量比较大的情况
2008-3-2712:
12cofish
搜一下就能搜到了
我再贴一次吧
[code]
#include
#include
#include
#include
#include
#include
#include
#include
#include
#defineMAXLINE10
#defineOPEN_MAX100
#defineLISTENQ20
#defineSERV_PORT5555
#defineINFTIM1000
//线程池任务队列结构体
structtask
{
intfd;//需要读写的文件描述符
structtask*next;//下一个任务
};
//用于读写两个的两个方面传递参数
structuser_data
{
intfd;
unsignedintn_size;
charline[MAXLINE];
};
//线程的任务函数
void*readtask(void*args);
void*writetask(void*args);
//声明epoll_event结构体的变量,ev用于注册事件,数组用于回传要处理的事件
structepoll_eventev,events[20];
intepfd;
pthread_mutex_tmutex;
pthread_cond_tcond1;
structtask*readhead=NULL,*readtail=NULL,*writehead=NULL;
voidsetnonblocking(intsock)
{
intopts;
opts=fcntl(sock,F_GETFL);
if(opts<0)
{
perror("fcntl(sock,GETFL)");
exit
(1);
}
opts=opts|O_NONBLOCK;
if(fcntl(sock,F_SETFL,opts)<0)
{
perror("fcntl(sock,SETFL,opts)");
exit
(1);
}
}
intmain()
{
inti,maxi,listenfd,connfd,sockfd,nfds;
pthread_ttid1,tid2;
structtask*new_task=NULL;
structuser_data*rdata=NULL;
socklen_tclilen;
pthread_mutex_init(&mutex,NULL);
pthread_cond_init(&cond1,NULL);
//初始化用于读线程池的线程
pthread_create(&tid1,NULL,readtask,NULL);
pthread_create(&tid2,NULL,readtask,NULL);
//生成用于处理accept的epoll专用的文件描述符
epfd=epoll_create(256);
structsockaddr_inclientaddr;
structsockaddr_inserveraddr;
listenfd=socket(AF_INET,SOCK_STREAM,0);
//把socket设置为非阻塞方式
setnonblocking(listenfd);
//设置与要处理的事件相关的文件描述符
ev.data.fd=listenfd;
//设置要处理的事件类型
ev.events=EPOLLIN|EPOLLET;
//注册epoll事件
epoll_ctl(epfd,EPOLL_CTL_ADD,listenfd,&ev);
bzero(&serveraddr,sizeof(serveraddr));
serveraddr.sin_family=AF_INET;
char*local_addr="200.200.200.222";
inet_aton(local_addr,&(serveraddr.sin_addr));//htons(SERV_PORT);
serveraddr.sin_port=htons(SERV_PORT);
bind(listenfd,(sockaddr*)&serveraddr,sizeof(serveraddr));
listen(listenfd,LISTENQ);
maxi=0;
for(;;)
{
//等待epoll事件的发生
nfds=epoll_wait(epfd,events,20,500);
//处理所发生的所有事件
for(i=0;i{
if(events[i].data.fd==listenfd)
{
connfd=accept(listenfd,(sockaddr*)&clientaddr,&clilen);
if(connfd<0)
{
perror("connfd<0");
exit
(1);
}
setnonblocking(connfd);
char*str=inet_ntoa(clientaddr.sin_addr);
std:
:
cout<<"connec_from>>"<:
endl;
//设置用于读操作的文件描述符
ev.data.fd=connfd;
//设置用于注测的读操作事件
ev.events=EPOLLIN|EPOLLET;
//注册ev
epoll_ctl(epfd,EPOLL_CTL_ADD,connfd,&ev);
}
elseif(events[i].events&EPOLLIN)
{
printf("reading!
\n");
if((sockfd=events[i].data.fd)<0)
continue;
new_task=newtask();
new_task->fd=sockfd;
new_task->next=NULL;
//添加新的读任务
pthread_mutex_lock(&mutex);
if(readhead==NULL)
{
readhead=new_task;
readtail=new_task;
}
else
{
readtail->next=new_task;
readtail=new_task;
}
//唤醒所有等待cond1条件的线程
pthread_cond_broadcast(&cond1);
pthread_mutex_unlock(&mutex);
}
elseif(events[i].events&EPOLLOUT)
{
rdata=(structuser_data*)events[i].data.ptr;
sockfd=rdata->fd;
write(sockfd,rdata->line,rdata->n_size);
deleterdata;
//设置用于读操作的文件描述符
ev.data.fd=sockfd;
//设置用于注测的读操作事件
ev.events=EPOLLIN|EPOLLET;
//修改sockfd上要处理的事件为EPOLIN
epoll_ctl(epfd,EPOLL_CTL_MOD,sockfd,&ev);
}
}
}
}
void*readtask(void*args)
{
intfd=-1;
unsignedintn;
//用于把读出来的数据传递出去
structuser_data*data=NULL;
while
(1)
{
pthread_mutex_lock(&mutex);
//等待到任务队列不为空
while(readhead==NULL)
pthread_cond_wait(&cond1,&mutex);
fd=readhead->fd;
//从任务队列取出一个读任务
structtask*tmp=readhead;
readhead=readhead->next;
deletetmp;
pthread_mutex_unlock(&mutex);
data=newuser_data();
data->fd=fd;
if((n=read(fd,data->line,MAXLINE))<0)
{
if(errno==ECONNRESET)
{
close(fd);
}else
std:
:
cout<<"readlineerror"<:
endl;
if(data!
=NULL)
deletedata;
}
elseif(n==0)
{
close(fd);
printf("Clientcloseconnect!
\n");
if(data!
=NULL)
deletedata;
}
else
{
data->n_size=n;
//设置需要传递出去的数据
ev.data.ptr=data;
//设置用于注测的写操作事件
ev.events=EPOLLOUT|EPOLLET;
//修改sockfd上要处理的事件为EPOLLOUT
epoll_ctl(epfd,EPOLL_CTL_MOD,fd,&ev);
}
}
}
[/code]
[code]
/*-------------------------------------------------------------------------------------------------
gcc-oepolldepoll.c-lpthread
author:
wyezl
2006.4.28
---------------------------------------------------------------------------------------------------*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#definePORT8888
#defineMAXFDS5000
#defineEVENTSIZE100
#defineBUFFER"HTTP/1.1200OK\r\nContent-Length:
5\r\nConnection:
close\r\nContent-Type:
text/html\r\n\r\nHello"
intepfd;
void*serv_epoll(void*p);
voidsetnonblocking(intfd)
{
intopts;
opts=fcntl(fd,F_GETFL);
if(opts<0)
{
fprintf(stderr,"fcntlfailed\n");
return;
}
opts=opts|O_NONBLOCK;
if(fcntl(fd,F_SETFL,opts)<0)
{
fprintf(stderr,"fcntlfailed\n");
return;
}
return;
}
intmain(intargc,char*argv[])
{
intfd,cfd,opt=1;
structepoll_eventev;
structsockaddr_insin,cin;
socklen_tsin_len=sizeof(structsockaddr_in);
pthread_ttid;
pthread_attr_tattr;
epfd=epoll_create(MAXFDS);
if((fd=socket(AF_INET,SOCK_STREAM,0))<=0)
{
fprintf(stderr,"socketfailed\n");
return-1;
}
setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,(constvoid*)&opt,sizeof(opt));
memset(&sin,0,sizeof(structsockaddr_in));
sin.sin_family=AF_INET;
sin.sin_port=htons((short)(PORT));
sin.sin_addr.s_addr=INADDR_ANY;
if(bind(fd,(structsockaddr*)&sin,sizeof(sin))!
=0)
{
fprintf(stderr,"bindfailed\n");
return-1;
}
if(listen(fd,32)!
=0)
{
fprintf(stderr,"listenfailed\n");
return-1;
}
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED);
if(pthread_create(&tid,&attr,serv_epoll,NULL)!
=0)
{
fprintf(stderr,"pthread_createfailed\n");
return-1;
}
while
(1)
{
cfd=accept(fd,(structsockaddr*)&cin,&sin_len);
if(cfd<=0)
{
sleep
(1);
continue;
}
setnonblocking(cfd);
ev.data.fd=cfd;
ev.events=EPOLLIN|EPOLLET;
if(epoll_ctl(epfd,EPOLL_CTL_ADD,cfd,&ev)<0)
{
close(cfd);
}
//printf("connectfrom%s\n",inet_ntoa(cin.sin_addr));
//printf("cfd=%d\n",cfd);
}
if(fd>0)
close(fd);
return0;
}
void*serv_epoll(void*p)
{
inti,ret,cfd,nfds;
structepoll_eventev,events[EVENTSIZE];
charbuffer[512];
while
(1){
nfds=epoll_wait(epfd,events,EVENTSIZE,-1);
//printf("nfds...........%d\n",nfds);
for(i=0;i{
if(events[i].events&EPOLLIN)
{
cfd=events[i].data.fd;
ret=recv(cfd,buffer,sizeof(buffer),0);
//printf("readret..........=%d\n",ret);
ev.data.fd=cfd;
ev.events=EPOLLOUT|EPOLLET;
epoll_ctl(epfd,EPOLL_CTL_MOD,cfd,&ev);
}
elseif(events[i].events&EPOLLOUT)
{
cfd=events[i].data.fd;
ret=send(cfd,buffer,strlen(buffer),0);
//printf("sendret...........=%d\n",ret);
ev.data.fd=cfd;
epoll_ctl(epfd,EPOLL_CTL_DEL,cfd,&ev);
//shutdown(cfd,1);
if(cfd>0)
close(cfd);
}
}
}
returnNULL;
}
[/code]