Fifo Flushing Error - fifo

Question

I am trying this code,
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<signal.h>
int fileFD = 0;
pthread_t Thread_application;
pthread_t Read_Thread;
void * Waiting_Thread(void * arg)
{
while(1) {
printf("Created Thread\n");
sleep(1);
}
}
void * Readtread(void *arg)
{
char buf[1902] = {0};
int ret = 0;
while(1) {
ret = read(fileFD, buf, 120);
printf("Read Bytes\n");
}
}
void main()
{
int i = 0;
mkfifo("Desktop/Trail_Programs/ClientFIFO", 0666);
fileFD = open("Desktop/Trail_Programs/ClientFIFO", O_RDWR);
pthread_create(&Thread_application, NULL, Waiting_Thread, NULL);
pthread_create(&Read_Thread, NULL, Readtread, NULL);
sleep(10);
close(fileFD);
pthread_kill(Thread_application, 0);
pthread_kill(Read_Thread, 0);
system("dd if=Desktop/Trail_Programs/ClientFIFO iflag=nonblock of=/dev/null");
for(i = 0; i < 10; i++) {
printf("Main Thread \n");
fflush(stdout);
}
}
Output: Created Thread
Created Thread
Created Thread
Created Thread
Created Thread
Created Thread
Created Thread
Created Thread
Created Thread
Created Thread
Created Thread
dd: error reading
‘Desktop/Trail_Programs/ClientFIFO’: Resource
temporarily unavailable
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.000314463 s, 0.0 kB/s
Main Thread
Main Thread
Main Thread
Main Thread
Main Thread
Main Thread
Main Thread
Main Thread
Main Thread
Main Thread
I suppose read is blocking while i am trying to flush the fifo into /dev/null. In my use case opening file with O_NONBLOCK flag and using select to monitor fd, keeps my other processes lagging. please help me with some suggestions
Thanks and Regards,
Ap