#include <stdio.h>
#ifdef _OPENMP
  #include<omp.h>
#endif
int main() {
/*Example of a race condition*/
int n=1000000,a=0;
#pragma omp parallel shared(a,n)
{
  #pragma omp for
  for (int i=0; i<n; i++) {
    /*When one thread writes to a, the value of a
    it had read might not be current anymore*/
    a+=i;
  }
}
/*Show what was produced*/
printf("a= %i\n",a);
return 0;
}