OpenMP on for() loops

See more:

C++

parallel

OpenMP

I'm using OpenMP to parallelise a couple of for() loops but I'm not sure which "#pragma" command is the right one to use. These situations that I've faced which hopefully possible to parallelise. Really need your help in this.

Situation 1 - Is it possible to use "#pragma omp parallel for" here? Because I'm afraid of whether would it affect in returning values in parallel.

Triangle Triangle::t_ID_lookup(Triangle a[], int ID, int n)
{
    Triangle res;
    for(int i=0; i<n; i++)
    {
        if(ID==a[i].t_ID)
            return (res=a[i]);
    }
    return res;
}

Situation 2 - I've tried "#pragma omp parallel for" here but it crashes as I run it. I believe we are not allowed to push_back() values in parallel.

vector<Triangle> Triangle::special(Triangle a[], int n)
{
    vector<Triangle> spec;
    for(int i=0; i<n; i++)
    {
        if(a[i].diagonal > 27.0)
            spec.push_back(a[i]);
    }
    return spec;
}