Parallelizing a for loop using openmp & replacing push_back

Question

I\'d like to parallelize the following piece of code but am new to openmp and creating parallel code.

std::vector good_matches;
for (int i = 0;         


        

Answer 1

I showed how to do this here c-openmp-parallel-for-loop-alternatives-to-stdvector

Make private versions of the std::vector and fill the shared std::vector in a critical section like this:

std::vector good_matches;
#pragma omp parallel
{
    std::vector good_matches_private;
    #pragma omp for nowait
    for (int i = 0; i < descriptors_A.rows; i++) {
       if (matches_RM[i].distance < 3 * min_dist) {
          good_matches_private.push_back(matches_RM[i]);
       }
    }
    #pragma omp critical
    good_matches.insert(good_matches.end(), good_matches_private.begin(), good_matches_private.end());
}