多线程网络服务
1、多线程网络服务
：多线程网络模式类似于多进程网络模式；不同的是：新客户端到来时，启动的是一个线程(每来一个客户，将创建一个线程)。
模型分析
2、代码实现
同样用处理整数运算来模拟多线程的并发处理
(1)、utili.h
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#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
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#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;
}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 == -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 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){
printf("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
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#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);
}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;
} |
运行结果
服务器端
客户1
客户2
3、分析总结
多线程网络服务也存在线程的动态申请与释放，还是有一定的开销，若存在大量用户在线，很可能带来线程间切换开销。