螺纹和 select 插座 c

Question

I am very new in network programming and am very confused about system call select. I am not very sure when I should use select or thread to manage a multiclient server (or both)

For example, I have wrote this code to manage an indefinite number of clients. For every client I create a thread, read a message and wait until client send another one. Is this right or I should use a select in this case?

//Called after listen()
void connectionRequestManagement(){
    struct sockaddr_in client;
    pthread_t tid;

    while(1){ 
       socket_accept = accept(socket_fd,(struct sockaddr* )&client, (socklen_t*)&size_connection);
       PtrClientStruct new_client = new_clientInfo(socket_accept,inet_ntoa(client.sin_addr));
       insert_client(&head_client_list, new_client);
       pthread_create(&tid,NULL,connection_handler, (void*)new_client);
       new_client->tid_handler=tid;
       pthread_detach(tid); 
   }
}

void *connection_handler(void* args){    
   PtrClientStruct tc = (PtrClientStruct)args;
   int sock=*(int*) (tc->socket_thread); 
   char op [2] = {'\n'};
   while(true){
       if(readn(sock,op,2)<0)
            break;  
       if(atoi(op) == 0)
           break;
       chose_op(sock,atoi(op), &tc); //Just some read and write
   }  
   //Delete node and his stuff
   delete_client(&head_client_list,*(((PtrClientStruct)args)->socket_thread));
   close(sock);
   pthread_exit(0);
}

Answer 1

I am very new in network programming and am very confused about system call select. I am not very sure when I should use select or thread to manage a multiclient server (or both)

For example, I have wrote this code to manage an indefinite number of clients. For every client I create a thread, read a message and wait until client send another one. Is this right or I should use a select in this case?

//Called after listen()
void connectionRequestManagement(){
    struct sockaddr_in client;
    pthread_t tid;

    while(1){ 
       socket_accept = accept(socket_fd,(struct sockaddr* )&client, (socklen_t*)&size_connection);
       PtrClientStruct new_client = new_clientInfo(socket_accept,inet_ntoa(client.sin_addr));
       insert_client(&head_client_list, new_client);
       pthread_create(&tid,NULL,connection_handler, (void*)new_client);
       new_client->tid_handler=tid;
       pthread_detach(tid); 
   }
}

void *connection_handler(void* args){    
   PtrClientStruct tc = (PtrClientStruct)args;
   int sock=*(int*) (tc->socket_thread); 
   char op [2] = {'\n'};
   while(true){
       if(readn(sock,op,2)<0)
            break;  
       if(atoi(op) == 0)
           break;
       chose_op(sock,atoi(op), &tc); //Just some read and write
   }  
   //Delete node and his stuff
   delete_client(&head_client_list,*(((PtrClientStruct)args)->socket_thread));
   close(sock);
   pthread_exit(0);
}