Chat Room Application file

#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <pthread.h>
#include <iostream>
#include <cstdlib>

using namespace std;

string username;
int stop=0;

void* reader(void* directory){
	char* myfifo = (char*) directory;
	mkfifo(myfifo,0606);
	char readArr[256];
	int ReadFD, delay;
	while(1){
		if(delay>0){
			usleep(10000);
			delay=0;
		}
		ReadFD = open(myfifo,O_RDONLY);
		read(ReadFD,readArr,sizeof(readArr));
		string text = readArr;
		cout<<text<<endl;
		if(text.substr(0,username.length()) == username){
			int WriteFd = open(myfifo, O_WRONLY);
			write(WriteFd,readArr,sizeof(readArr)+1);
			close(WriteFd);
			delay++;
		}else{
		}
		close(ReadFD);
	}
	pthread_exit(NULL);
}

void* write(void* directory){
	char* myfifo = (char*) directory;
	mkfifo(myfifo,0666);
	const char* writeArr;
	int WriteFd;
	string input;
	while(1){
		usleep(1000);
		cout<<"Enter your message (enter <tab> for help):\n";
		getline(cin, input);
		if(input=="\t"){
			cout<<"Special keywords: 'exit' to close, 'clear' to clear chat screen\n";
		}else if(input=="exit"){
			cout<<"You have left the chatroom.\n";
			stop++;
		}else if(input=="clear"){
			system("clear");
		}else{
			WriteFd = open(myfifo,O_WRONLY);
			string fulltext = username+": "+input;
			writeArr=fulltext.c_str();
			write(WriteFd,writeArr,strlen(writeArr)+1);
			close(WriteFd);
		}
	}
	pthread_exit(NULL);
}

int main(){
	system("clear");
	cout<<"Please enter your name: ";
	getline(cin, username);
	system("clear");
	cout<<"Hello "<<username<<"\nWelcome to our chat room\n";
	pthread_t treader, twriter;
	const char* myfifo= "/tmp/my/fifo";
	int rc=pthread_create(&treader,NULL,reader,(void*) myfifo);
	if(rc){
		cout<<"Unable to create thread "<<rc<<endl;
		exit(-1);
	}

	 rc=pthread_create(&twriter,NULL,writer,(void*) myfifo);

	if(rc){
		cout<<"Unable to create thread "<<rc<<endl;
		exit(-1);
	}
	while(stop==0){
	}
	return 0;
}