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分类: C/C++

2015-09-02 10:13:13

原文地址:高并发的epoll+多线程 作者:ehyyngp

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。
 
下面是来一个网络连接创建一个线程处理业务,业务处理完,线程销毁。实际测试结果不是很理想,在没有业务的时候的测试结果是2000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 <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <fcntl.h>
#include <sys/epoll.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <pthread.h>

#define MAXBUF 1024
#define MAXEPOLLSIZE 10000

void* pthread_handle_message(void* para);
/*
setnonblocking - 设置句柄为非阻塞方式
*/

int setnonblocking(int sockfd)
{
    if (fcntl(sockfd, F_SETFL, fcntl(sockfd, F_GETFD, 0)|O_NONBLOCK) == -1) {
        return -1;
    }
    return 0;
}

static int count111 = 0;
static time_t oldtime = 0, nowtime = 0;

//------------------------------------------------------------
int main(int argc, char **argv)
{
    int listener, new_fd, nfds, n, ret;
    struct epoll_event ev;
    int kdpfd, curfds;
    socklen_t len;
    struct sockaddr_in my_addr, their_addr;
    unsigned int myport, lisnum;
    struct epoll_event events[MAXEPOLLSIZE];
    struct rlimit rt;

    if (argc>1)
        myport = atoi(argv[1]);
    else
        myport = 8006;

    if (argc>2)
        lisnum = atoi(argv[2]);
    else
        lisnum = 10;

    /* 设置每个进程允许打开的最大文件数 */
    rt.rlim_max = rt.rlim_cur = MAXEPOLLSIZE;
    if (setrlimit(RLIMIT_NOFILE, &rt) == -1) {
        perror("setrlimit");
        exit(1);
    }
    else printf("设置系统资源参数成功!/n");

    /* 开启 socket 监听 */
    if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket");
        exit(1);
    } else
        printf("socket 创建成功!/n");

    /*设置socket属性,端口可以重用*/
    int opt=SO_REUSEADDR;
    setsockopt(listener,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));

    /*设置socket为非阻塞模式*/
    setnonblocking(listener);

    bzero(&my_addr, sizeof(my_addr));
    my_addr.sin_family = PF_INET;
    my_addr.sin_port = htons(myport);
    if (argc>3)
        my_addr.sin_addr.s_addr = inet_addr(argv[3]);
    else
        my_addr.sin_addr.s_addr = INADDR_ANY;

    if (bind
        (listener, (struct sockaddr *) &my_addr, sizeof(struct sockaddr))
        == -1) {
            perror("bind");
            exit(1);
    } else
        printf("IP 地址和端口绑定成功/n");

    if (listen(listener, lisnum) == -1) {
        perror("listen");
        exit(1);
    } else
        printf("开启服务成功!/n");

    /* 创建 epoll 句柄,把监听 socket 加入到 epoll 集合里 */
    kdpfd = epoll_create(MAXEPOLLSIZE);
    len = sizeof(struct sockaddr_in);
    ev.events = EPOLLIN | EPOLLET;
    ev.data.fd = listener;
    if (epoll_ctl(kdpfd, EPOLL_CTL_ADD, listener, &ev) < 0) {
        fprintf(stderr, "epoll set insertion error: fd=%d/n", listener);
        return -1;
    } else
        printf("监听 socket 加入 epoll 成功!/n");
    curfds = 1;
    while (1) {
        /* 等待有事件发生 */
        nfds = epoll_wait(kdpfd, events, curfds, -1);
        if (nfds == -1) {
            perror("epoll_wait");
            continue;
        }
        /* 处理所有事件 */
        for (n = 0; n < nfds; ++n) {
            if (events[n].data.fd == listener) {
                new_fd = accept(listener, (struct sockaddr *) &their_addr,
                    &len);
                if (new_fd < 0) {
                    perror("accept");
                    continue;
                } else
                {
                    //printf("有连接来自于: %s:%d, 分配的 socket 为:%d/n", inet_ntoa(their_addr.sin_addr), ntohs(their_addr.sin_port), new_fd);

                }
                setnonblocking(new_fd);
                ev.events = EPOLLIN | EPOLLET;
                ev.data.fd = new_fd;
                if (epoll_ctl(kdpfd, EPOLL_CTL_ADD, new_fd, &ev) < 0) {
                    fprintf(stderr, "把 socket '%d' 加入 epoll 失败!%s/n",
                        new_fd, strerror(errno));
                    return -1;
                }
                curfds++;
            } else { 
                pthread_attr_t attr;
                pthread_t threadId;
                

                /*初始化属性值,均设为默认值*/
                pthread_attr_init(&attr);
                pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
                /* 设置线程为分离属性*/
                pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
                if(pthread_create(&threadId,&attr,pthread_handle_message,(void*)&(events[n].data.fd)))
                {
                    perror("pthread_creat error!");
                    exit(-1);
                } 
            }
        }
    }
    close(listener);
    return 0;
}


void* pthread_handle_message(void* para)
{
    char recvBuf[1024] = {0}; 
    int ret = 999;
    int rs = 1;
    int socketfd = *(int *)para;

    while(rs)
    {
        ret = recv(socketfd,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! errno:%d\n", errno);
        
                close(socketfd);
                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){
        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(socketfd,buf, strlen(buf),0);
    }
    close(socketfd);
}


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