【并发服务器系列】3 epoll模型
chat_server.cpp
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
#include "chat.h"
extern int sock_server_init(int &listenfd , uint16_t server_port);
void err_quit(const char *error_string)
{
printf("%s\n", error_string);
exit(1);
}
void err_sys(const char *error_string)
{
printf("%s\n", error_string);
}
extern ssize_t p_read_from_p(int clientfd);
extern ssize_t p_write_to_p(int clientfd, const char *msg);
int do_use_fd(int fd)
{
p_read_from_p(fd);
// sleep(2);
p_write_to_p(fd, "Hi this is server");
}
//#define WAIT_TIME_OUT
void sig_chld(int signo)
{
pid_t pid;
int stat;
while( (pid = waitpid(-1, &stat, WNOHANG)) > 0 )
{
printf("client %d terminated \n", pid);
}
return;
}
int setnonblocking(int fd)
{
return fcntl(fd, F_SETFL, O_NONBLOCK) ;
}
#include <sys/epoll.h>
#define MAX_EVENTS 1000
void chat_server()
{
int listenfd, connfd, nfds, epollfd;
struct epoll_event ev, events[MAX_EVENTS];
struct sockaddr_in cliaddr;
socklen_t clilen;
char buf[200] = {0};
sock_server_init(listenfd, SERVER_PORT);
epollfd = epoll_create(MAX_EVENTS);
if(epollfd == -1)
{
perror("epoll_create");
exit(EXIT_FAILURE);
}
ev.events = EPOLLIN;
ev.data.fd = listenfd;
if(epoll_ctl(epollfd, EPOLL_CTL_ADD, listenfd, &ev) == -1)
{
perror("epoll_ctl listenfd");
exit(EXIT_FAILURE);
}
// sleep(10);
int i_have_server_client_counter = 0;
for(;;)
{
nfds = epoll_wait(epollfd, events, MAX_EVENTS, -1);
if(nfds == -1)
{
perror("epoll_wait");
exit(EXIT_FAILURE);
}
for(int n = 0; n < nfds; ++n)
{
printf("got client counts %d handling fd: %d\n", nfds, events[n].data.fd );
if(events[n].data.fd == listenfd)
{
clilen = sizeof(cliaddr);
connfd = accept(listenfd, (struct sockaddr *)&cliaddr , &clilen);
if(connfd == -1)
{
perror("accept");
exit(EXIT_FAILURE);
}
printf("incoming connection from IP: %s Port: %d\n",
inet_ntop(AF_INET, &cliaddr.sin_addr, buf, sizeof(buf)),
ntohs(cliaddr.sin_port));
setnonblocking(connfd);
ev.events = EPOLLIN|EPOLLET;
ev.data.fd = connfd;
if(epoll_ctl(epollfd,EPOLL_CTL_ADD, connfd, &ev) == -1)
{
perror("epoll_ctl: connfd");
exit(EXIT_FAILURE);
}
}//if
else
{
do_use_fd(events[n].data.fd);
i_have_server_client_counter++;
printf("server count %d\n", i_have_server_client_counter);
if(epoll_ctl(epollfd,EPOLL_CTL_DEL, events[n].data.fd, &ev) == -1)
{
perror("epoll_ctl: EPOLL_CTL_DEL events[n].data.fd");
exit(EXIT_FAILURE);
}
close(events[n].data.fd);
}
}//for
}//for
extern int sock_server_init(int &listenfd , uint16_t server_port);
void err_quit(const char *error_string)
{
printf("%s\n", error_string);
exit(1);
}
void err_sys(const char *error_string)
{
printf("%s\n", error_string);
}
extern ssize_t p_read_from_p(int clientfd);
extern ssize_t p_write_to_p(int clientfd, const char *msg);
int do_use_fd(int fd)
{
p_read_from_p(fd);
// sleep(2);
p_write_to_p(fd, "Hi this is server");
}
//#define WAIT_TIME_OUT
void sig_chld(int signo)
{
pid_t pid;
int stat;
while( (pid = waitpid(-1, &stat, WNOHANG)) > 0 )
{
printf("client %d terminated \n", pid);
}
return;
}
int setnonblocking(int fd)
{
return fcntl(fd, F_SETFL, O_NONBLOCK) ;
}
#include <sys/epoll.h>
#define MAX_EVENTS 1000
void chat_server()
{
int listenfd, connfd, nfds, epollfd;
struct epoll_event ev, events[MAX_EVENTS];
struct sockaddr_in cliaddr;
socklen_t clilen;
char buf[200] = {0};
sock_server_init(listenfd, SERVER_PORT);
epollfd = epoll_create(MAX_EVENTS);
if(epollfd == -1)
{
perror("epoll_create");
exit(EXIT_FAILURE);
}
ev.events = EPOLLIN;
ev.data.fd = listenfd;
if(epoll_ctl(epollfd, EPOLL_CTL_ADD, listenfd, &ev) == -1)
{
perror("epoll_ctl listenfd");
exit(EXIT_FAILURE);
}
// sleep(10);
int i_have_server_client_counter = 0;
for(;;)
{
nfds = epoll_wait(epollfd, events, MAX_EVENTS, -1);
if(nfds == -1)
{
perror("epoll_wait");
exit(EXIT_FAILURE);
}
for(int n = 0; n < nfds; ++n)
{
printf("got client counts %d handling fd: %d\n", nfds, events[n].data.fd );
if(events[n].data.fd == listenfd)
{
clilen = sizeof(cliaddr);
connfd = accept(listenfd, (struct sockaddr *)&cliaddr , &clilen);
if(connfd == -1)
{
perror("accept");
exit(EXIT_FAILURE);
}
printf("incoming connection from IP: %s Port: %d\n",
inet_ntop(AF_INET, &cliaddr.sin_addr, buf, sizeof(buf)),
ntohs(cliaddr.sin_port));
setnonblocking(connfd);
ev.events = EPOLLIN|EPOLLET;
ev.data.fd = connfd;
if(epoll_ctl(epollfd,EPOLL_CTL_ADD, connfd, &ev) == -1)
{
perror("epoll_ctl: connfd");
exit(EXIT_FAILURE);
}
}//if
else
{
do_use_fd(events[n].data.fd);
i_have_server_client_counter++;
printf("server count %d\n", i_have_server_client_counter);
if(epoll_ctl(epollfd,EPOLL_CTL_DEL, events[n].data.fd, &ev) == -1)
{
perror("epoll_ctl: EPOLL_CTL_DEL events[n].data.fd");
exit(EXIT_FAILURE);
}
close(events[n].data.fd);
}
}//for
}//for
Performance:Testing Machine: Local test ,OS: Fedora 14(Linux 2.6.35) 2 Cores:E3200@2.4GHz, Memory: 2GiB
Result: Handles about 300~400 clients per sec
not so many as I expected