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多线程服务器

步骤

主线程创建子线程，用子线程和客户端通信。
步骤：
1.使用socket函数，获取一个socket文件描述符
2.使用setsockopt端口复用
3.使用bind函数允许客户端的哪些ip可以访问服务器
4.使用listen监听客户端连接
5.使用accept从已连接的客户端队列中取出一个文件描述符，与它通信
6.使用pthread_create函数创建一个子线程去与上面的文件描述符通信
7.使用pthread_detach函数将子线程设置为分离属性，让它自动回收资源

代码

#include <socketwrap.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <strings.h>
#include <string.h>
#include <ctype.h>
#include <arpa/inet.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <unistd.h>typedef struct info
{int cfd; // 若为-1表示可用, 大于0表示已被占用int idx;pthread_t thread;          // 由pthread_create 返回struct sockaddr_in client; // 由accept 返回
} INFO;INFO thInfo[1024];void initThreadArr()
{for (int i = 0; i < 1024; i++){bzero(&thInfo[i],sizeof(thInfo[i]));thInfo[i].cfd = -1;}
}int findIndex()
{int i;for (i = 0; i < 1024; i++){if (thInfo[i].cfd == -1){return i;}}if (i == 1024){return -1;}
}void *threadFunc(void *arg)
{INFO *curthread = (INFO *)arg;char sIP[16];printf("current thread id [%ld],arr index is [%d],cfd is [%d],client ip is [%s:%d]\n", pthread_self(), curthread->idx, curthread->cfd, inet_ntop(AF_INET, &curthread->client.sin_addr.s_addr, sIP, sizeof(sIP)), ntohs(curthread->client.sin_port));char buff[64];while (1){memset(buff, 0x00, sizeof(buff));int n = Read(curthread->cfd, buff, sizeof(buff));if (n == 0){bzero(&thInfo[curthread->idx],sizeof(thInfo[curthread->idx]));thInfo[thInfo->idx].cfd = -1;return 0;}else if (n < 0){bzero(&thInfo[curthread->idx],sizeof(thInfo[curthread->idx]));thInfo[thInfo->idx].cfd = -1;perror("child read error");return 0;}printf("child thread [%ld] recv data from [%s:%d]:[%s]\n", pthread_self(), inet_ntop(AF_INET, &curthread->client.sin_addr.s_addr, sIP, sizeof(sIP)), ntohs(curthread->client.sin_port), buff);for (int i = 0; i < n; i++){buff[i] = toupper(buff[i]);}n = Write(curthread->cfd, buff, n);if (n <= 0){bzero(&thInfo[curthread->idx],sizeof(thInfo[curthread->idx]));thInfo[thInfo->idx].cfd = -1;perror("child write error");return 0;}}
}int main()
{initThreadArr();int sfd = Socket(AF_INET, SOCK_STREAM, 0);// 设置端口复用int opt = 1;setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(int));struct sockaddr_in soaddr;bzero(&soaddr, sizeof(soaddr));soaddr.sin_family = AF_INET;soaddr.sin_port = htons(9999);soaddr.sin_addr.s_addr = htonl(INADDR_ANY);Bind(sfd, (struct sockaddr *)&soaddr, sizeof(soaddr));// 监听-listenListen(sfd, 128);struct sockaddr_in clientsocket;socklen_t clilen;int cfd;int index;int ret;while (1){index = -1;clilen = sizeof(clientsocket);bzero(&clientsocket, clilen);cfd = Accept(sfd, (struct sockaddr *)&clientsocket, &clilen);// 从线程数组中找一个可以用的index = findIndex();thInfo[index].idx = index;thInfo[index].client = clientsocket;thInfo[index].cfd = cfd;// 创建线程ret = pthread_create(&thInfo[index].thread, NULL, threadFunc, &thInfo[index]);if (ret != 0){printf("create thread error:[%s]\n", strerror(ret));exit(-1);}// 设置子线程为分离属性pthread_detach(thInfo[index].thread);}Close(sfd);return 0;
}