source: CIVL/examples/omp/dataracebench-1.3.2/micro-benchmarks/DRB018-plusplus-orig-yes.c

/*
Copyright (c) 2017, Lawrence Livermore National Security, LLC.
Produced at the Lawrence Livermore National Laboratory
Written by Chunhua Liao, Pei-Hung Lin, Joshua Asplund,
Markus Schordan, and Ian Karlin
(email: liao6@llnl.gov, lin32@llnl.gov, asplund1@llnl.gov,
schordan1@llnl.gov, karlin1@llnl.gov)
LLNL-CODE-732144
All rights reserved.

This file is part of DataRaceBench. For details, see
https://github.com/LLNL/dataracebench. Please also see the LICENSE file
for our additional BSD notice.

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  may be used to endorse or promote products derived from this
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*/

/* NOTE by WenhaoWu (wuwenhao@udel.edu)
 * This example is modified so that the bound can be adjusted 
 * by defining 'N' and if it isn't defined then the bound value 
 * in the original example is used as the default value of 'N' 
 */
#ifndef N
#define N 1000
#endif 

/* Data race on outLen due to ++ operation.
Adding private (outLen) can avoid race condition. But it is wrong semantically.
Data races on outLen also cause output[outLen++] to have data races.

Data race pairs (we allow two pairs to preserve the original code pattern):
1. outLen@81 vs. outLen@81
2. output[]@81 vs. output[]@81
*/
#include <stdlib.h>
#include <stdio.h>
int input[N]; 
int output[N];

int main()
{
  int i ;
  int inLen=N ; 
  int outLen = 0;

  for (i=0; i<inLen; ++i) 
    input[i]= i;  

#pragma omp parallel for
  for (i=0; i<inLen; ++i) 
  {
    output[outLen++] = input[i] ;
  }  

  printf("output[%d]=%d\n", N/2, output[N/2]); // Modified for avoiding Out-of-bound

  return 0;
}