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Chapter 15 in Programming Linux high performance Servers. Process pools and thread pools
Thread pool server program
The implementation of processpool processpool.h
#ifndef PROCESSPOOL_H
#define PROCESSPOOL_H
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/epoll.h>
#include <signal.h>
#include <sys/wait.h>
#include <sys/stat.h>
class process
{
public:
process() : m_pid( -1 ){}
public:
pid_t m_pid;
int m_pipefd[2];
};
template< typename T >
class processpool
{
private:
processpool( int listenfd, int process_number = 8 );
public:
static processpool< T >* create( int listenfd, int process_number = 8 )
{
if( !m_instance )
{
m_instance = new processpool< T >( listenfd, process_number );
}
return m_instance;
}
~processpool()
{
delete [] m_sub_process;
}
void run();
private:
void setup_sig_pipe();
void run_parent();
void run_child();
private:
static const int MAX_PROCESS_NUMBER = 16;
static const int USER_PER_PROCESS = 65536;
static const int MAX_EVENT_NUMBER = 10000;
int m_process_number;
int m_idx;
int m_epollfd;
int m_listenfd;
int m_stop;
process* m_sub_process;
static processpool< T >* m_instance;
};
template< typename T >
processpool< T >* processpool< T >::m_instance = NULL;
static int sig_pipefd[2];
static int setnonblocking( int fd )
{
int old_option = fcntl( fd, F_GETFL );
int new_option = old_option | O_NONBLOCK;
fcntl( fd, F_SETFL, new_option );
return old_option;
}
static void addfd( int epollfd, int fd )
{
epoll_event event;
event.data.fd = fd;
event.events = EPOLLIN | EPOLLET;
epoll_ctl( epollfd, EPOLL_CTL_ADD, fd, &event );
setnonblocking( fd );
}
static void removefd( int epollfd, int fd )
{
epoll_ctl( epollfd, EPOLL_CTL_DEL, fd, 0 );
close( fd );
}
static void sig_handler( int sig )
{
int save_errno = errno;
int msg = sig;
send( sig_pipefd[1], ( char* )&msg, 1, 0 );
errno = save_errno;
}
static void addsig( int sig, void( handler )(int), bool restart = true )
{
struct sigaction sa;
memset( &sa, '\0', sizeof( sa ) );
sa.sa_handler = handler;
if( restart )
{
sa.sa_flags |= SA_RESTART;
}
sigfillset( &sa.sa_mask );
assert( sigaction( sig, &sa, NULL ) != -1 );
}
template< typename T >
processpool< T >::processpool( int listenfd, int process_number )
: m_listenfd( listenfd ), m_process_number( process_number ), m_idx( -1 ), m_stop( false )
{
assert( ( process_number > 0 ) && ( process_number <= MAX_PROCESS_NUMBER ) );
m_sub_process = new process[ process_number ];
assert( m_sub_process );
for( int i = 0; i < process_number; ++i )
{
int ret = socketpair( PF_UNIX, SOCK_STREAM, 0, m_sub_process[i].m_pipefd );
assert( ret == 0 );
m_sub_process[i].m_pid = fork();
assert( m_sub_process[i].m_pid >= 0 );
if( m_sub_process[i].m_pid > 0 )
{
close( m_sub_process[i].m_pipefd[1] );
continue;
}
else
{
close( m_sub_process[i].m_pipefd[0] );
m_idx = i;
break;
}
}
}
template< typename T >
void processpool< T >::setup_sig_pipe()
{
m_epollfd = epoll_create( 5 );
assert( m_epollfd != -1 );
int ret = socketpair( PF_UNIX, SOCK_STREAM, 0, sig_pipefd );
assert( ret != -1 );
setnonblocking( sig_pipefd[1] );
addfd( m_epollfd, sig_pipefd[0] );
addsig( SIGCHLD, sig_handler );
addsig( SIGTERM, sig_handler );
addsig( SIGINT, sig_handler );
addsig( SIGPIPE, SIG_IGN );
}
template< typename T >
void processpool< T >::run()
{
if( m_idx != -1 )
{
run_child();
return;
}
run_parent();
}
template< typename T >
void processpool< T >::run_child()
{
setup_sig_pipe();
int pipefd = m_sub_process[m_idx].m_pipefd[ 1 ];
addfd( m_epollfd, pipefd );
epoll_event events[ MAX_EVENT_NUMBER ];
T* users = new T [ USER_PER_PROCESS ];
assert( users );
int number = 0;
int ret = -1;
while( ! m_stop )
{
number = epoll_wait( m_epollfd, events, MAX_EVENT_NUMBER, -1 );
if ( ( number < 0 ) && ( errno != EINTR ) )
{
printf( "epoll failure\n" );
break;
}
for ( int i = 0; i < number; i++ )
{
int sockfd = events[i].data.fd;
if( ( sockfd == pipefd ) && ( events[i].events & EPOLLIN ) )
{
int client = 0;
ret = recv( sockfd, ( char* )&client, sizeof( client ), 0 );
if( ( ( ret < 0 ) && ( errno != EAGAIN ) ) || ret == 0 )
{
continue;
}
else
{
struct sockaddr_in client_address;
socklen_t client_addrlength = sizeof( client_address );
int connfd = accept( m_listenfd, ( struct sockaddr* )&client_address, &client_addrlength );
if ( connfd < 0 )
{
printf( "errno is: %d\n", errno );
continue;
}
addfd( m_epollfd, connfd );
users[connfd].init( m_epollfd, connfd, client_address );
}
}
else if( ( sockfd == sig_pipefd[0] ) && ( events[i].events & EPOLLIN ) )
{
int sig;
char signals[1024];
ret = recv( sig_pipefd[0], signals, sizeof( signals ), 0 );
if( ret <= 0 )
{
continue;
}
else
{
for( int i = 0; i < ret; ++i )
{
switch( signals[i] )
{
case SIGCHLD:
{
pid_t pid;
int stat;
while ( ( pid = waitpid( -1, &stat, WNOHANG ) ) > 0 )
{
continue;
}
break;
}
case SIGTERM:
case SIGINT:
{
m_stop = true;
break;
}
default:
{
break;
}
}
}
}
}
else if( events[i].events & EPOLLIN )
{
users[sockfd].process();
}
else
{
continue;
}
}
}
delete [] users;
users = NULL;
close( pipefd );
//close( m_listenfd );
close( m_epollfd );
}
template< typename T >
void processpool< T >::run_parent()
{
setup_sig_pipe();
addfd( m_epollfd, m_listenfd );
epoll_event events[ MAX_EVENT_NUMBER ];
int sub_process_counter = 0;
int new_conn = 1;
int number = 0;
int ret = -1;
while( ! m_stop )
{
number = epoll_wait( m_epollfd, events, MAX_EVENT_NUMBER, -1 );
if ( ( number < 0 ) && ( errno != EINTR ) )
{
printf( "epoll failure\n" );
break;
}
for ( int i = 0; i < number; i++ )
{
int sockfd = events[i].data.fd;
if( sockfd == m_listenfd )
{
int i = sub_process_counter;
do
{
if( m_sub_process[i].m_pid != -1 )
{
break;
}
i = (i+1)%m_process_number;
}
while( i != sub_process_counter );
if( m_sub_process[i].m_pid == -1 )
{
m_stop = true;
break;
}
sub_process_counter = (i+1)%m_process_number;
//send( m_sub_process[sub_process_counter++].m_pipefd[0], ( char* )&new_conn, sizeof( new_conn ), 0 );
send( m_sub_process[i].m_pipefd[0], ( char* )&new_conn, sizeof( new_conn ), 0 );
printf( "send request to child %d\n", i );
//sub_process_counter %= m_process_number;
}
else if( ( sockfd == sig_pipefd[0] ) && ( events[i].events & EPOLLIN ) )
{
int sig;
char signals[1024];
ret = recv( sig_pipefd[0], signals, sizeof( signals ), 0 );
if( ret <= 0 )
{
continue;
}
else
{
for( int i = 0; i < ret; ++i )
{
switch( signals[i] )
{
case SIGCHLD:
{
pid_t pid;
int stat;
while ( ( pid = waitpid( -1, &stat, WNOHANG ) ) > 0 )
{
for( int i = 0; i < m_process_number; ++i )
{
if( m_sub_process[i].m_pid == pid )
{
printf( "child %d join\n", i );
close( m_sub_process[i].m_pipefd[0] );
m_sub_process[i].m_pid = -1;
}
}
}
m_stop = true;
for( int i = 0; i < m_process_number; ++i )
{
if( m_sub_process[i].m_pid != -1 )
{
m_stop = false;
}
}
break;
}
case SIGTERM:
case SIGINT:
{
printf( "kill all the clild now\n" );
for( int i = 0; i < m_process_number; ++i )
{
int pid = m_sub_process[i].m_pid;
if( pid != -1 )
{
kill( pid, SIGTERM );
}
}
break;
}
default:
{
break;
}
}
}
}
}
else
{
continue;
}
}
}
//close( m_listenfd );
close( m_epollfd );
}
#endif
Copy the codeImplementation of the main program:
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/epoll.h>
#include <signal.h>#include <sys/wait.h> #include <sys/stat.h> #include "processpool.h" class cgi_conn { public: cgi_conn() : m_sockfd(-1), m_read_idx(-1) { memset(m_buf, 0, sizeof(m_buf)); } public: void init(int epollfd, int sockfd, const sockaddr_in& client_addr) { m_epollfd = epollfd; m_sockfd = sockfd; m_address = client_addr; m_read_idx = 0; } void process() { int idx = 0; int ret = 1; While (true) {idx = m_read_idx; ret = recv(m_sockfd, m_buf+idx, BUFFER_SIZE-1-idx, 0); printf("recv ret=%d\n", ret); If (ret < 0) {if(errno! = EAGAIN) { removefd(m_epollfd, m_sockfd); } break; Else if(ret == 0) {removefd(m_epollfd, m_sockfd); break; } else { m_read_idx += ret; printf("user content is: %s", m_buf); // If the character CRLF is encountered, the client request for(; idx<m_read_idx; + + independence idx) {if ((independence idx > = 1) && (m_buf [independence idx - 1] = = '\ r) && (m_buf/independence idx = =' \ n ')) / / here find CRLF adopt the method of simple traversal has read data break; If (idx == m_read_IDx) {continue; if(idx == m_read_IDx) {continue; } m_buf[idx-1] = '\0'; char* file_name = m_buf; printf("file_name=%s\n", file_name); If (access(file_name, F_OK) == -1) {removefd(m_epollfd, m_sockfd); Printf ("file not found\n"); break; } // Create a child process to execute the CGI program ret = fork(); if(ret == -1) { removefd(m_epollfd, m_sockfd); break; } else if(ret > 0) {// The parent process simply closes the connection with removefd(m_epollfd, m_sockfd); break; // The parent process break} else {// the child process directs the standard output to sockfd_ and executes the CGI program close(STDOUT_FILENO); dup(m_sockfd); execl(m_buf, m_buf, 0); exit(0); }} private: // Read buffer size static const int BUFFER_SIZE = 1024; static int m_epollfd; int m_sockfd; sockaddr_in m_address; char m_buf[BUFFER_SIZE]; Int m_read_IDx; // Mark the next position in the buffer where the last byte of customer data was read in. }; int cgi_conn::m_epollfd = -1; int main(int argc, char** argv) { if (argc <= 2) { printf("usage: %s ip_address port_number\n", basename(argv[0])); //return -1; } const char* IP = "127.0.0.1"; //argv[1]; int port = 8011; //atoi(argv[2]); int listenfd = socket(AF_INET, SOCK_STREAM, 0); assert(listenfd >= 0); int ret = 0; struct sockaddr_in address; memset(&address, 0, sizeof(address)); address.sin_family = AF_INET; address.sin_addr.s_addr = htonl(INADDR_ANY); //ok //inet_pton(AF_INET, ip, &servaddr.sin_addr); Sin_port = htons(port); // If "127.0.0.1" is used, the Windows client of the physical machine cannot connect to the VM. int on = 1; setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); ret = bind(listenfd, (struct sockaddr*)&address, sizeof(address)); if(ret == -1) { printf("what: %m\n"); return -1; } ret = listen(listenfd, 5); assert(ret ! = 1); processpool<cgi_conn>* pool = processpool<cgi_conn>::create(listenfd);
if(pool) {
pool->run();
delete pool;
}
close(listenfd);
return 0;
}
Copy the code\
2. Cgi programs, assuming that the executable file name generated by compilation is called “CGI”
#include <stdio.h>
int main()
{
printf("hello,client");
return 0;
}
Copy the code3, test,
Find a client to connect to the server, then send “cgi\r\n”, cgi is the file name, the server will reply “Hello,client”.
The source code download: download.csdn.net/download/li…
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