Multi thread communication between client and server (primary version)

Specific ideas ：

Using multithreading , Let the main thread accept new connections , Let the child thread handle communication with the client ; To use multithreading, set the thread to the separation property , Let the thread reclaim resources after exiting .

Server code ：

server.c

// Multithreaded versions of highly concurrent servers 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <ctype.h>
#include <pthread.h>
#include "wrap.h"

// Child thread callback function 
void *thread_work(void *arg)
{
	int cfd = *(int *)arg;
	printf("cfd==[%d]\n", cfd);
	
	int i;
	int n;
	char buf[1024];
	
	while(1)
	{
		//read data 
		memset(buf, 0x00, sizeof(buf));
		n = Read(cfd, buf, sizeof(buf));
		if(n<=0)
		{
			printf("read error or client closed,n==[%d]\n", n);
			break;
		}
		printf("n==[%d], buf==[%s]\n", n, buf);
		
		for(i=0; i<n; i++)
		{
			buf[i] = toupper(buf[i]);
		}
		// Send data to client 
		Write(cfd, buf, n);	
	}
	
	// Close communication file descriptor 
	close(cfd);
	
	pthread_exit(NULL);
}
int main()
{
	// establish socket
	int lfd = Socket(AF_INET, SOCK_STREAM, 0);
	
	// Set up port multiplexing 
	int opt = 1;
	setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(int));
	
	// binding 
	struct sockaddr_in serv;
	bzero(&serv, sizeof(serv));
	serv.sin_family = AF_INET;
	serv.sin_port = htons(8888);
	serv.sin_addr.s_addr = htonl(INADDR_ANY);
	Bind(lfd, (struct sockaddr *)&serv, sizeof(serv));
	
	// Set listening 
	Listen(lfd, 128);
	
	int cfd;
	pthread_t threadID;
	while(1)
	{
		// Accept new connection 
		cfd = Accept(lfd, NULL, NULL);
		
		// Create child threads 
		pthread_create(&threadID, NULL, thread_work, &cfd);
		
		// Set the child thread as the separation property 
		pthread_detach(threadID);
	}

	// Close listener file descriptor 
	close(lfd);
	
	return 0;
}

Start the server after compiling , Use nc command nc： It can be used as client launch TCP or UDP Connect  . Start multiple terminals at the same time （ Simulation client ） To test .

The test results are as follows , Multiple clients make requests to the server , And get a response , Multi thread communication .