多线程实现并发

多线程并发服务器

架构

void* thread_fun(void* arg)
{
			while(1){
				recv()/send()
		}		
}

scokfd = socket()
bind()
listen()
while(1){
		accept()
		//连上就创建线程
		pthread_create(, ,thread_fun, )
		pthread_detach()
}

---

案例

/*
#    Multi-process concurrent server
#    https://www.cnblogs.com/kencszqh
#
#    File Name:  多线程并发.c
#    Created  :  2024/6/11
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/epoll.h>
#include <pthread.h>
#include <semaphore.h>
#include <sys/mman.h>
#include <sys/eventfd.h>
#include <sys/timerfd.h>
#include <sys/signalfd.h>
#include <sys/syscall.h>
#include <sys/prctl.h>
#include <sys/uio.h>

#define N 128
#define ERR_LOG(errmsg)                                     \
    do                                                      \
    {                                                       \
        perror(errmsg);                                     \
        exit(1);                                            \
    } while (0)

typedef struct
{
    struct sockaddr_in addr;
    int acceptfd;
} MSG;

void *pthread_func(void *arg)
{
    char buf[N] = {0};
    ssize_t bytes;
    MSG msg = *(MSG *)arg;

    while (1)
    {
        if ((bytes = read(msg->acceptfd, buf, sizeof(buf))) == -1)
        {
            if (errno == EINTR)
            {
                continue;
            }
            ERR_LOG("read");
        }
        else if (bytes == 0)
        {
            printf("client quit!\n");
            pthread_exit(NULL);
        }

        if (strncmp(buf, "quit", 4) == 0)
        {
            printf("client quit!\n");
            pthread_exit(NULL);
        }

        printf("[%s - %d]: %s\n", inet_ntoa(msg->addr.sin_addr), ntohs(msg->addr.sin_port), buf);

        strcat(buf, " ^_^ ");
        if (send(msg->acceptfd, buf, strlen(buf), 0) == -1)
        {
            ERR_LOG("fail to send");
        }
    }
}

int main(int argc, char *argv[])
{
    if (argc != 3)
    {
        fprintf(stderr, "Usage:%s [ip] [port]\n", argv[0]);
        exit(1);
    }

    int sockfd, acceptfd;
    struct sockaddr_in serveraddr, clientaddr;
    socklen_t addrlen = sizeof(serveraddr);

    // 1.创建套接字
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
    {
        ERR_LOG("socket");
    }

    // 2.绑定
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_port = htons(atoi(argv[2]));
    serveraddr.sin_addr.s_addr = inet_addr(argv[1]);

    if (bind(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) < 0)
    {
        ERR_LOG("bind");
    }

    // 3.监听
    if (listen(sockfd, 5) < 0)
    {
        ERR_LOG("listen");
    }

    // 4.接受客户端连接
    while (1)
    {
        if ((acceptfd = accept(sockfd, (struct sockaddr *)&clientaddr, &addrlen)) < 0)
        {
            ERR_LOG("accept");
        }

        MSG msg;
        msg.addr = clientaddr;
        msg.acceptfd = acceptfd;

        pthread_t thread;
        if (pthread_create(&thread, NULL, pthread_func, (void *)&msg) != 0)
        {
            ERR_LOG("pthread_create");
        }

        pthread_detach(thread);
    }
    return 0;
}