Linux下网络编程-简易多线程并发服务器和客户端

简易多线程并发服务器:

//编译命令：g++ -g PThreadSocketServer.cpp -o PThreadSocketServer -lpthread
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <pthread.h>

#define BUF_SIZE 100
#define MAX_CLNT 256

int clnt_cnt=0;
int clnt_socks[MAX_CLNT];
pthread_mutex_t mutx;

void * handle_clnt(void * arg);
void send_msg(const char * msg, int len);
void error_handling(const char * msg);

int main(int argc, char *argv[])
{
	int serv_sock, clnt_sock;
	struct sockaddr_in serv_adr, clnt_adr;
	socklen_t clnt_adr_sz;
	pthread_t t_id;

    if(argc!=2) 
    {
		printf("Usage : %s <port>\n", argv[0]);
		exit(1);
	}

	pthread_mutex_init(&mutx,NULL);
	serv_sock=socket(PF_INET, SOCK_STREAM, 0);

	memset(&serv_adr, 0, sizeof(serv_adr));
	serv_adr.sin_family=AF_INET; 
	serv_adr.sin_addr.s_addr=htonl(INADDR_ANY);
	serv_adr.sin_port=htons(atoi(argv[1]));
	
	if(bind(serv_sock, (struct sockaddr*) &serv_adr, sizeof(serv_adr))==-1)
		error_handling("bind() error");
	if(listen(serv_sock, 5)==-1)
		error_handling("listen() error");

	while (1)
	{
		clnt_adr_sz=sizeof(clnt_adr);
		clnt_sock=accept(serv_sock,(struct sockaddr*)&clnt_adr,&clnt_adr_sz);
		if(clnt_sock==-1)
		{
			error_handling("accept error!");
		}

		pthread_mutex_lock(&mutx);
		clnt_socks[clnt_cnt++]=clnt_sock;
		pthread_mutex_unlock(&mutx);
		
		pthread_create(&t_id,NULL,handle_clnt,&clnt_socks[clnt_cnt-1]);//创建线程
		printf("Connected client IP: %s \n", inet_ntoa(clnt_adr.sin_addr));
	}
	
	close(serv_sock);
    return 0;
}

void error_handling(const char * msg)
{
    fputs(msg, stderr);
	fputc('\n', stderr);
	exit(1);
}

void * handle_clnt(void * arg)
{
	pthread_detach(pthread_self());
	int clnt_sock=*(int *)arg;
	char msg[BUF_SIZE]="";
	ssize_t str_len=0;

	while((str_len=read(clnt_sock,msg,sizeof(msg)))!=0)
		send_msg(msg,str_len);

	pthread_mutex_lock(&mutx);
	for(int i=0;i<clnt_cnt;i++)
	{
		if(clnt_sock==clnt_socks[i])
		{
			while(i++<clnt_cnt-1)
			{
				clnt_socks[i]=clnt_socks[i+1];
			}
			break;
		}
	}
	clnt_cnt--;
	pthread_mutex_unlock(&mutx);
	close(clnt_sock);
	pthread_exit(NULL);
}

void send_msg(const char * msg, int len) //send to all
{
	pthread_mutex_lock(&mutx);
	for(int i=0;i<clnt_cnt;i++)
	{
		write(clnt_socks[i],msg,len);
	}
	pthread_mutex_unlock(&mutx);
}

简易多线程并发客户端:

//编译命令：g++ -g PThreadSocketClient.cpp -o PThreadSocketClient -lpthread
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <pthread.h>

#define BUF_SIZE 100
#define NAME_SIZE 20

char name[NAME_SIZE]="[DEFAULT]";
char msg[BUF_SIZE];

void* send_msg(void * arg);
void* recv_msg(void * arg);
void error_handling(const char * msg);

int main(int argc, char *argv[])
{
	int sock;
	struct sockaddr_in serv_addr;
	pthread_t snd_thread, rcv_thread;
	void * thread_return;

    if(argc!=4) 
    {
		printf("Usage : %s <IP> <port> <name>\n", argv[0]);
		exit(1);
	 }

	sprintf(name, "[%s]", argv[3]);
	sock=socket(PF_INET, SOCK_STREAM, 0);
	
	memset(&serv_addr, 0, sizeof(serv_addr));
	serv_addr.sin_family=AF_INET;
	serv_addr.sin_addr.s_addr=inet_addr(argv[1]);
	serv_addr.sin_port=htons(atoi(argv[2]));
	  
	if(connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr))==-1)
		error_handling("connect() error");

	pthread_create(&snd_thread,NULL,send_msg,(void*)&sock);
	pthread_create(&rcv_thread,NULL,recv_msg,(void*)&sock);
	pthread_join(snd_thread,&thread_return);
	pthread_join(rcv_thread,&thread_return);
	close(sock);
    return 0;
}

void* send_msg(void * arg)
{
	int sock=*(int *)arg;
	char name_msg[NAME_SIZE+BUF_SIZE];
	while(1)
	{
		fgets(msg,BUF_SIZE,stdin);
		if(!strcmp(msg,"q\n")||!strcmp(msg,"Q\n"))
		{
			close(sock);
			exit(0);
		}
		sprintf(name_msg,"%s %s",name,msg);
		write(sock,name_msg,strlen(name_msg));
	}
	return NULL;
}

void* recv_msg(void * arg)
{
	int sock=*(int *)arg;
	char name_msg[NAME_SIZE+BUF_SIZE];
	int str_len;
	while(1)
	{
		str_len=read(sock,name_msg,NAME_SIZE+BUF_SIZE-1);
		if(str_len==-1)
		{
			return (void*)-1;
		}
		name_msg[str_len]=0;
		fputs(name_msg,stdout);
	}
	return NULL;
}

void error_handling(const char * msg)
{
    fputs(msg, stderr);
	fputc('\n', stderr);
	exit(1);
}