高并发的epoll+线程池，业务在线程池内

epoll是linux下高并发服务器的完美方案，因为是基于事件触发的，所以比select快的不只是一个数量级。

单线程epoll，触发量可达到15000，但是加上业务后，因为大多数业务都与数据库打交道，所以就会存在阻塞的情况，这个时候就必须用多线程来提速。

 

业务在线程池内，这里要加锁才行。测试结果2300个/s

 

测试工具：stressmark

因为加了适用与ab的代码，所以也可以适用ab进行压力测试。

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
 
//线程池任务队列结构体

struct task{
  int fd; //需要读写的文件描述符

  struct task *next; //下一个任务

};
 
//用于读写两个的两个方面传递参数

struct user_data{
  int fd;
  unsigned int n_size;
  char line[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

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);
 
     struct sockaddr_in clientaddr;
     struct sockaddr_in serveraddr;
     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;
     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事件的发生

          nfds=epoll_wait(epfd,events,20,500);
          //处理所发生的所有事件

        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 >>"<
                    //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);
               }
            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);
              }
               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;
                 //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);
             */
               }
                             
          }
         
     }
}

static int count111 = 0;
static time_t oldtime = 0, nowtime = 0;
void * readtask(void *args)
{
   
   int fd=-1;
   unsigned int n;
   //用于把读出来的数据传递出去

   struct user_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

        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);// 接受客户端消息

            if(ret < 0)
            {
                //由于是非阻塞的模式,所以当errno为EAGAIN时,表示当前缓冲区已无数据可//读在这里就当作是该次事件已处理过。

                if(errno == EAGAIN)
                {
                    printf("EAGAIN\n");
                    break;
                }
                else{
                    printf("recv error!\n");
        
                    close(fd);
                    break;
                }
            }
            else if(ret == 0)
            {
                // 这里表示对端的socket已正常关闭.

                rs = 0;
            }
            if(ret == sizeof(recvBuf))
                rs = 1; // 需要再次读取

            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);


       }
   }
}