source: CIVL/examples/omp/dataracebench-1.3.2/micro-benchmarks/DRB074-flush-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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*/

/*
This benchmark is extracted from flush_nolist.1c of OpenMP Application
Programming Interface Examples Version 4.5.0 .
We added one critical section to make it a test with only one pair of data races.
The data race will not generate wrong result though. So the assertion always passes.
Data race pair:  i@70:10 vs. i@71:11
*/
#include<stdio.h>
#include<assert.h>

void f1(int *q)
{
#pragma omp critical
  *q = 1;
#pragma omp flush
}

int main()
{ 
  int i=0, sum=0; 
  
  #pragma omp parallel reduction(+:sum) num_threads(10) 
  {
     f1(&i);
     sum+=i;
  }
  assert (sum==10);
  printf("sum=%d\n", sum);
  return 0;   
}