Multithreaded Network Services

1, multi-threaded network services

: Multithreaded network mode is similar to multi-process network mode; the difference is that when a new client arrives, a thread is started.

Model analysis

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2. Code implementation

Also using integer arithmetic to simulate multithreading concurrency

(1), utili.h

#include <unistd.h> #include <stdio.h> #include <string.h> #include <stdlib.h> #include <sys /socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <pthread.h> #define Server_ PORT 9090#define server_ip "127.0.0.1" #define Listen_queue 5#define buffer_size 255typedef enum{add,sub,mul,div,mod    , quit}oper_type;typedef struct operstruct{int op1;    int OP2; Oper_type OPER;} Operstruct;

(2), ser.c

#include ". /utili.h "Void* thread_handler (Void *arg); Void* thread_handler (Void *arg) {     int sockconn = * (int *) arg;    operstruct op;      int result;    while (1) {         int res = recv (sockconn, &op, sizeof (OP),  0);          if (res == -1) {             printf ("recv data fail.\n");             continue;        }            if (Op.oper == add) {             result = op.op1 + op.op2;        &nbsP;} Else if (op.oper == sub) {             result = op.op1 - op.op2;        }else  if (Op.oper == mul) {            result  = op.op1 * op.op2;        }else if (Op.oper  == DIV) {            result =  Op.op1 / op.op2;        }else if (op.oper ==  QUIT) {            break;         }           res =  Send (sockconn, &result, sizeof (result),  0);          if (RES ==&NBsp;-1) {            printf ("send data  fail.\n ");            continue;         }    }    close (SockConn);     pthread_exit (0);} Int main (void) {    int sockser = socket (Af_inet, sock_stream,  0);     if (sockser == -1) {         Perror ("socket");         return -1;    }     struct sockaddr_in addrser, addrcli;    addrser.sin _family = af_inet;    addrser.sin_port = htons (SERVER_PORT);     ADDRSER.SIN_ADDR.S_ADDR = INET_ADDR (SERVER_IP);     socklen_t& nbSp;len = sizeof (STRUCT SOCKADDR);     int res = bind (SockSer,   (struct sockaddr*) &addrser, len);     if (res == -1) {         perror ("bind");         close (Sockser);        return -1;            }    listen (Sockser, listen_queue);     int sockconn;    while (1) {         printf ("server wait client connect.......\n");         Sockconn = accept (sockser,  (struct sockaddr*) &addrcli, &len);         if (sockconn == -1) {             p rintf ("server accept client connect fail.\n");             continue;        }else{             printf ("server accept client  Connect success.\n ");             printf (" Client ip:>%s\n ",  inet_ntoa (ADDRCLI.SIN_ADDR));             printf ("client port:>%d\n", Ntohs (addrcli.sin_port));         }        pthread_t tid;         pthread_create (&tid, null, thread_handler, &sockconn);             }    close (sockSer );     return 0;} 

(3), CLI.C

#include "utili.h" Void inputdata (operstruct *pt); Void inputdata (OPERSTRUCT *PT) {     printf ("please input op1 and op2 : ");     scanf ("%d %d", & (PT->OP1), & (PT->OP2));} Cliint main (void) {    int sockcli = socket (AF_INET, SOCK_STREAM ,  0);      if (sockcli == -1) {         perror ("socket");        return -1;      }       struct sockaddr_in addrSer;     Addrser.sin_family = af_inet;    addrser.sin_port = htons (SERVER_PORT) ;     addrser.sin_addr.s_addr = inet_addr (SERVER_IP);     Socklen_t len = sizeof (STRUCT SOCKADDR);    int res = connect (sockcli,  (struct sockaddr*) &addrSer,  len);     if (res == -1) {         Perror ("Connect");         close (SOCKCLI);         return -1;     }else{         printf ("client connect server success.\n");    }     char cmd[2];    OperStruct  op;     Int result;    while (1) {        printf (" please input operator :  ");         SCANF ("%s ", cmd) ;         if (strcmp (cmd,  "+")  == 0) {             op.oper = add;             inputdata (&OP);         }else if (strcmp (cmd, "-")  ==  0) {            op.oper = sub;             inputdata (&OP);         }else if (strcmp (cmd, "*")  == 0) {             op.oper = MUL;             inputdata (&OP);         }else if (strcmp (cmd, "/")  == 0) {            op.oper = div;             inputdata (&OP);     &nBsp;   }else if (strcmp (cmd,  "quit")  == 0) {             op.oper = QUIT;         }else{            printf ("Cmd invalid.\ n ");                }         res = send (sockcli, &op, sizeof (OP),  0) ;         if (res == -1) {             printf ("send data fail.\n");             continue;        }         if (op.oper == quit)              BREAK;        RES = RECV (SockCli, &result,  sizeof (Result),  0);         if (res == -1) {             printf ("recv data fail.\n");             continue;         }        printf ("result = %d\n",  result);     }    close (sockcli);     return 0;}

Run results

Server-side

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Customer 1

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Customer 2

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3. Analysis and summary

Multithreaded Network Service also has the dynamic application and release of threads, or there is a certain overhead, if there are a large number of users online, it is likely to bring the switching overhead between threads.

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Multithreaded Network Services