epoll是linux下高并發(fā)服務(wù)器的完美方案，因?yàn)槭腔谑录|發(fā)的，所以比select快的不只是一個(gè)數(shù)量級(jí)。
單線程epoll，觸發(fā)量可達(dá)到15000，但是加上業(yè)務(wù)后，因?yàn)榇蠖鄶?shù)業(yè)務(wù)都與數(shù)據(jù)庫打交道，所以就會(huì)存在阻塞的情況，這個(gè)時(shí)候就必須用多線程來提速。
業(yè)務(wù)在線程池內(nèi)，這里要加鎖才行。測試結(jié)果2300個(gè)/s
測試工具：stressmark
因?yàn)榧恿诉m用與ab的代碼，所以也可以適用ab進(jìn)行壓力測試。
char buf[1000] = {0}; sprintf(buf,"HTTP/1.0 200 OK\r\nContent-type: text/plain\r\n\r\n%s","Hello world!\n"); send(socketfd,buf, strlen(buf),0);
 #include <iostream>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <pthread.h>
#include <errno.h>
#define MAXLINE 10
#define OPEN_MAX 100
#define LISTENQ 20
#define SERV_PORT 8006
#define INFTIM 1000
//線程池任務(wù)隊(duì)列結(jié)構(gòu)體
  struct task {
 int fd; //需要讀寫的文件描述符
struct task *next; //下一個(gè)任務(wù)
 };
//用于讀寫兩個(gè)的兩個(gè)方面?zhèn)鬟f參數(shù)
struct user_data{
int fd;
unsigned int n_size;
char line[MAXLINE];
};
//線程的任務(wù)函數(shù)
void * readtask(void *args);
void * writetask(void *args);
//聲明epoll_event結(jié)構(gòu)體的變量,ev用于注冊事件,數(shù)組用于回傳要處理的事件
struct epoll_event ev,events[20];
int epfd;
pthread_mutex_t mutex;
pthread_cond_t cond1;
struct task *readhead=NULL,*readtail=NULL,*writehead=NULL;
void setnonblocking(int sock)
{
int opts;
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);
}
}
int main()
{
int i, maxi, listenfd, connfd, sockfd,nfds;
pthread_t tid1,tid2;
struct task *new_task=NULL;
struct user_data *rdata=NULL;
socklen_t clilen;
pthread_mutex_init(&mutex,NULL);
pthread_cond_init(&cond1,NULL);
//初始化用于讀線程池的線程
pthread_create(&tid1,NULL,readtask,NULL);
pthread_create(&tid2,NULL,readtask,NULL);
//生成用于處理accept的epoll專用的文件描述符
epfd=epoll_create(256);
struct sockaddr_in clientaddr;
struct sockaddr_in serveraddr;
listenfd = socket(AF_INET, SOCK_STREAM, 0);
//把socket設(shè)置為非阻塞方式
setnonblocking(listenfd);
//設(shè)置與要處理的事件相關(guān)的文件描述符
ev.data.fd=listenfd;
//設(shè)置要處理的事件類型
ev.events=EPOLLIN|EPOLLET;
//注冊epoll事件
epoll_ctl(epfd,EPOLL_CTL_ADD,listenfd,&ev);
bzero(&serveraddr, sizeof(serveraddr));
serveraddr.sin_family = AF_INET;
serveraddr.sin_port=htons(SERV_PORT);
serveraddr.sin_addr.s_addr = INADDR_ANY;
bind(listenfd,(sockaddr *)&serveraddr, sizeof(serveraddr));
listen(listenfd, LISTENQ);
maxi = 0;
for ( ; ; ) {
//等待epoll事件的發(fā)生
nfds=epoll_wait(epfd,events,20,500);
//處理所發(fā)生的所有事件
for(i=0;i<nfds;++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 >>"<<str<<std::endl;
//設(shè)置用于讀操作的文件描述符
ev.data.fd=connfd;
//設(shè)置用于注測的讀操作事件
ev.events=EPOLLIN|EPOLLET;
//注冊ev
epoll_ctl(epfd,EPOLL_CTL_ADD,connfd,&ev);
}
else if(events[i].events&EPOLLIN)
{
//printf("reading!/n");
if ( (sockfd = events[i].data.fd) < 0) continue;
new_task=new task();
new_task->fd=sockfd;
new_task->next=NULL;
//添加新的讀任務(wù)
pthread_mutex_lock(&mutex);
if(readhead==NULL)
{
readhead=new_task;
readtail=new_task;
}
else
{
readtail->next=new_task;
readtail=new_task;
}
//喚醒所有等待cond1條件的線程
pthread_cond_broadcast(&cond1);
pthread_mutex_unlock(&mutex);
}
else if(events[i].events&EPOLLOUT)
{
/**//*
rdata=(struct user_data *)events[i].data.ptr;
sockfd = rdata->fd;
write(sockfd, rdata->line, rdata->n_size);
delete rdata;
//設(shè)置用于讀操作的文件描述符
ev.data.fd=sockfd;
//設(shè)置用于注測的讀操作事件
ev.events=EPOLLIN|EPOLLET;
//修改sockfd上要處理的事件為EPOLIN
epoll_ctl(epfd,EPOLL_CTL_MOD,sockfd,&ev);
*/
}
}
}
}
static int count111 = 0;
static time_t oldtime = 0, nowtime = 0;
void * readtask(void *args)
{
int fd=-1;
unsigned int n;
//用于把讀出來的數(shù)據(jù)傳遞出去
struct user_data *data = NULL;
while(1){
pthread_mutex_lock(&mutex);
//等待到任務(wù)隊(duì)列不為空
while(readhead==NULL)
pthread_cond_wait(&cond1,&mutex);
fd=readhead->fd;
//從任務(wù)隊(duì)列取出一個(gè)讀任務(wù)
struct task *tmp=readhead;
readhead = readhead->next;
delete tmp;
pthread_mutex_unlock(&mutex);
data = new user_data();
data->fd=fd;
char recvBuf[1024] = {0};
int ret = 999;
int rs = 1;
while(rs)
{
ret = recv(fd,recvBuf,1024,0);// 接受客戶端消息
if(ret < 0)
{
//由于是非阻塞的模式,所以當(dāng)errno為EAGAIN時(shí),表示當(dāng)前緩沖區(qū)已無數(shù)據(jù)可//讀在這里就當(dāng)作是該次事件已處理過。
if(errno == EAGAIN)
{
printf("EAGAIN\n");
break;
}
else{
printf("recv error!\n");
close(fd);
break;
}
}
else if(ret == 0)
{
// 這里表示對(duì)端的socket已正常關(guān)閉.
rs = 0;
}
if(ret == sizeof(recvBuf))
rs = 1; // 需要再次讀取
else
rs = 0;
}
if(ret>0){
//-------------------------------------------------------------------------------
data->n_size=n;
count111 ++;
struct tm *today;
time_t ltime;
time( &nowtime );
if(nowtime != oldtime){
printf("%d\n", count111);
oldtime = nowtime;
count111 = 0;
}
char buf[1000] = {0};
sprintf(buf,"HTTP/1.0 200 OK\r\nContent-type: text/plain\r\n\r\n%s","Hello world!\n");
send(fd,buf,strlen(buf),0);
close(fd);
}
}
}
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