Reading two different files simultaneously - c++

Question

I have 2 files and i want each core read its own file ( each file has 5 lines ) and display its content
in this code I have 2 cores ( core0 , core1) the output core 0 read the content of core1 ( 5 lines ). and core1 read 4 lines from his content.
I tried to make it as if else conditions and each file has its own reader but the same problem still exist.what should i do ?
#include <vector>
#include <stdio.h>
#include <time.h>
#include <mpi.h>
#include <omp.h>
#include <fstream>
#include <iostream>
using namespace std;
void func2(int CoreID )
{
int iFace;
int iFaces=0;
if (CoreID==0)
{
FILE* imgListFile = 0;
char imgFilename[5012];
char actualPath[90]="C:\\DaliaDaliaSh\\TrainingFiles\\File10img_0_C";
strcat(actualPath , "0.txt");
imgListFile= freopen(actualPath , "r",stdin);
while (fgets(imgFilename, 5012, imgListFile))
{
++iFaces;
printf( "** Core = %d , Path = %s\n" , CoreID , imgFilename );
}
rewind(imgListFile);
}
else if (CoreID==1)
{
FILE* imgListFile2 = 0;
char imgFilename2[5012];
char actualPath2[90]="C:\\DaliaDaliaSh\\TrainingFiles\\File10img_0_C";
strcat(actualPath2 , "1.txt");
imgListFile2= freopen(actualPath2 , "r",stdin);
while (fgets(imgFilename2, 5012, imgListFile2))
{
++iFaces;
printf( "** Core = %d , Path = %s\n" , CoreID , imgFilename2 );
}
rewind(imgListFile2);
}
//printf ("*ID = %d open actualPath= %s\n" , myId , actualPath);
printf("core %d , iFaces= %d \n", CoreID , iFaces);
}
void main(int argc,char **argv)
{
MPI::Init(argc,argv);
int threadnum=2;
omp_set_num_threads(threadnum);
#pragma omp parallel
{
int CoreID = omp_get_thread_num();
int x ;
func2(CoreID);
cout <<"####after call func inside pragma \n" ;
}
MPI ::Finalize();
}

Answer 1

You are doing freopen on stdin. Thus, both cores will use the same stream and the file read will depend upon which core opened the stream first/last [which is a race condition].
Do a regular fopen instead and they won't conflict [as they're doing now]