source: CIVL/examples/omp/DataRaceBench/micro-benchmarks/reductionmissing-var-yes.c@ af3b8e4

/* A kernel for two level parallelizable loop with reduction 
 if reduction(error) is missing, there is race condition.
*/
#include <stdlib.h>

int main(int argc, char* argv[])
{
  int i,j;
  float temp, error;
  int len=100;

  if (argc>1)
    len = atoi(argv[1]);

   float u[len][len];
#pragma omp parallel for private (temp,i,j)
  for (i = 0; i < len; i++)
    for (j = 0; j < len; j++)
    {
      temp = u[i][j];
      error = error + temp * temp;
    }
}