c多线程socket编程

① c++ 多线程socket编程可以多个线程同时accept数据吗

监听连接都用一个线程就行了，多线程监听是不明智的，监听到之后把创建连接的套接字发送给其他线程通信就行。。。。

② c语言 多线程套接字编程

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <sys/socket.h>

#define PORT 5000 // The port which is communicate with server
#define BACKLOG 10
#define LENGTH 512 // Buffer length
int main ()
{ int sockfd; // Socket file descriptor
int nsockfd; // New Socket file descriptor
int num;
int sin_size; // to store struct size
char sdbuf[LENGTH]; // Send buffer
struct sockaddr_in addr_local;
struct sockaddr_in addr_remote;
char sendstr[16]= {"123456789 abcde"};

/* Get the Socket file descriptor */
if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1 )
{
printf ("ERROR: Failed to obtain Socket Despcritor.\n");
return (0);
}
else
{
printf ("OK: Obtain Socket Despcritor sucessfully.\n");
}

/* Fill the local socket address struct */
addr_local.sin_family = AF_INET; // Protocol Family
addr_local.sin_port = htons(PORT); // Port number
addr_local.sin_addr.s_addr = INADDR_ANY; // AutoFill local address
bzero(&(addr_local.sin_zero), 8); // Flush the rest of struct

/* Blind a special Port */
if( bind(sockfd, (struct sockaddr*)&addr_local, sizeof(struct sockaddr)) == -1 )
{
printf ("ERROR: Failed to bind Port %d.\n",PORT);
return (0);
}
else
{
printf("OK: Bind the Port %d sucessfully.\n",PORT);
}

/* Listen remote connect/calling */
if(listen(sockfd,BACKLOG) == -1)
{
printf ("ERROR: Failed to listen Port %d.\n", PORT);
return (0);
}
else
{
printf ("OK: Listening the Port %d sucessfully.\n", PORT);
}

while(1)
{
sin_size = sizeof(struct sockaddr_in);

/* Wait a connection, and obtain a new socket file despriptor for single connection */
if ((nsockfd = accept(sockfd, (struct sockaddr *)&addr_remote, &sin_size)) == -1)
{
printf ("ERROR: Obtain new Socket Despcritor error.\n");
continue;
}
else
{
printf ("OK: Server has got connect from %s.\n", inet_ntoa(addr_remote.sin_addr));
}

/* Child process */
if(!fork())
{
printf("You can enter string, and press 'exit' to end the connect.\n");
while(strcmp(sdbuf,"exit") != 0)
{
scanf("%s", sdbuf);
if((num = send(nsockfd, sdbuf, strlen(sdbuf), 0)) == -1)
{
printf("ERROR: Failed to sent string.\n");
close(nsockfd);
exit(1);
}
printf("OK: Sent %d bytes sucessful, please enter again.\n", num);
}
}
close(nsockfd);
while(waitpid(-1, NULL, WNOHANG) > 0);
}
}

③ linux c socket 如何实现一个进程多个线程，每个线程管理多个socket连接

大家仔细看，楼主的题目还是很有难度的呢，一个进程多个线程容易实现，但是要让这些线程中每个线程都管理多个socket连接，确实比较难~~坐等高手。
不过一般都是一个线程处理一个socket连接，这种例子是：
（取自书上，仅供学习，直接编译肯定通不过，少书上其他代码）
==================================================
/* include serv06 */#include "unpthread.h"
intmain(int argc, char **argv)
{
int listenfd, connfd;
void sig_int(int);
void *doit(void *);
pthread_t tid;
socklen_t clilen, addrlen;
struct sockaddr *cliaddr;

if (argc == 2) listenfd = Tcp_listen(NULL, argv[1], &addrlen);
else if (argc == 3)
listenfd = Tcp_listen(argv[1], argv[2], &addrlen);
else
err_quit("usage: serv06 [ <host> ] <port#>");
cliaddr = Malloc(addrlen);

Signal(SIGINT, sig_int);
for ( ; ; ) { clilen = addrlen;
connfd = Accept(listenfd, cliaddr, &clilen);

Pthread_create(&tid, NULL, &doit, (void *) connfd); }
}

void *doit(void *arg)
{
void web_child(int);

Pthread_detach(pthread_self()); web_child((int) arg);
Close((int) arg);
return(NULL);
}
/* end serv06 */

voidsig_int(int signo)
{
void pr_cpu_time(void);

pr_cpu_time(); exit(0);
}
================================================================

④ C# winForm Socket 多线程 编程 关闭问题

2中方式，除主线程外其他线程设置为后台线程，即background thread，这是线程创建时的一个属性，另一种就是应用程序退出时的事件里手动退出线程
----
void Application_Exit(object sender,args e)
{
//thread.abort();

}

好像是这样写吧，好久没用C#了，有点忘了，MSDN上有详细的说明

socket是非托管资源，我的理解是最好首先清理（在其他线程前）；

⑤ 刚介入linux c的socket编程没多久，想要写一个socket客户端，实现多线程处理发送和接收，哪位大侠帮帮忙啊

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define PORT 8888

void *yourfunction(void *connect_fd)
{
int connfd = *((int *)connect_fd);
。。。。
} //你没说具体的应用，所以只能写这么多了。在这里面直接对connfd调用read和write函数就可以和客户端收发数据了。

／／补充：是啊 返回给客户端什么信息啊？

int main(void)
{
int sockfd, n, connfd;
pthread_t tid;
struct sockaddr_in servaddr;

sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd == -1)
{
perror("socket:");
exit(1);
}

bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(PORT);

n = bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
if (n == -1)
{
perror("bind:");
exit(1);
}

n = listen(sockfd, 20);
if (n == -1)
{
perror("listen:");
exit(1);
}

while (1)
{
connfd = accept(sockfd, (struct sockaddr *)&servaddr, NULL);
pthread_create(&tid, NULL, yourfunction, (void *)&connfd);
}

return 0;
}

⑥ C语言基础网络编程求助 如何实现多线程

#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <pthread.h>

void*thread(void*);
int client[5],i;

main()
{
int serverSocket= socket(AF_INET,SOCK_STREAM,0);
struct sockaddr_in server_addr;
struct sockaddr_in clientAddr;
int addr_len = sizeof(clientAddr);
//线程
pthread_t id;
pthread_attr_t attr;
pthread_attr_init(&attr);////////////////////////////////////////////////
pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED);
//创建地址
bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family =AF_INET;
server_addr.sin_port = htons(5555);
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
//绑定
bind(serverSocket,(struct sockaddr *)&server_addr,sizeof(server_addr));
listen(serverSocket,5);
for(i=0;i<5;i++)
{
client[i] = accept(serverSocket,(struct sockaddr *)&clientAddr,(socklen_t*)&addr_len);
pthread_create(&id,&attr,thread,(void *)&client[i]);/////////////////////////////////
pthread_join(id,NULL);
}
close(serverSocket);/////////////////////////
return 0;
}
void* thread(void* argv)
{
char buffer[200];
int a=i;
int s_c = *((int*)argv);///////////////////
while(1)
{
int n = recv(s_c,buffer,sizeof(buffer),0);
if(n > 0)
printf("客户端发过来的 : %s\n",buffer);
else
return;
}
close(s_c);
}