epoll+多线程服务程序“惊群”

大家都知道，多个accept已经不会出现“惊群”现象了，但是多个epoll还是会出现惊群。

一下服务器程序是多线程的惊群现象。

#include <stdio.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <errno.h>
#include <pthread.h>
#include <signal.h>


int sockfd;
 
int pthread_handle_message(void)
{
   struct sockaddr_in cli_addr;
      int nfds=0;
   int newsockfd=0;
   int clilen=0;
   struct epoll_event ev;
    int fd_epoll=0;
       struct epoll_event events[20];
 
   printf(" come in pthread !!\n");
   
   fd_epoll=epoll_create(256);
 if(fd_epoll<0)
 {  
    printf("pthread create epoll failed!!!\n");
 }
 printf("pthread create epoll success!!!\n");

 ev.data.fd=sockfd;
 ev.events= EPOLLIN | EPOLLET;     
 epoll_ctl(fd_epoll,EPOLL_CTL_ADD,sockfd,&ev);
      printf(" add epoll success!!!\n");
   
   clilen = sizeof(cli_addr);
   
      printf("add epool event!\n");
      
      nfds=epoll_wait(fd_epoll,events,20,-1);
      printf("pthread[%d] wake up!\n", pthread_self());
      
newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
if(newsockfd==-1 && errno==EAGAIN)
{
    printf("no client connect, continue!!!\n");
    pthread_exit(NULL);
}
printf(" pthread[%d] accept socket !!\n", pthread_self());
  pthread_exit(NULL);
   
 }
 static void sig_handler(const int sig) {
    printf("Signal handled: %s.\n", strsignal(sig));
    exit(0);
}
int main(int argc, char *argv[])
{


 int newsockfd;


 char buffer[2560000];
 struct sockaddr_in serv_addr;
 int n;
 int flags=0;
 int i;
 int pid=0;


 signal(SIGINT, sig_handler);
 signal(SIGTERM, sig_handler);
 sockfd = socket(AF_INET, SOCK_STREAM, 0);
 if (sockfd < 0)
 {
  printf("opening socket error! \n");
  exit(-1);
 }
#if 1
 flags = fcntl(sockfd, F_GETFL, 0); 
 fcntl(sockfd, F_SETFL, flags | O_NONBLOCK);
#endif  
 bzero((char *)&serv_addr, sizeof(serv_addr));
 serv_addr.sin_family = AF_INET;
 serv_addr.sin_addr.s_addr = INADDR_ANY;
 serv_addr.sin_port = htons(55560);
 if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
 {
  printf("socket binding error! \n");
  exit(-1);
 }


 printf("listen socket\n");
 listen(sockfd, 5);


  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);
  for(i=0; i < 3; i++)
  {
      if(pthread_create(&threadId,&attr,pthread_handle_message,NULL))
      { 
          perror("pthread_creat error!"); 
          exit(-1); 
      } 
  }
 
  while(1)
  {
      sleep(100);
  }
  close(sockfd); 
 
}