openmp_test.cpp

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// Build with:
//gcc -Wall -fopenmp openmp_test.cpp -lstdc++ -o openmp_test
#include <iostream>
using namespace std;

#include <omp.h>

int main(int argc, char *argv[])
{
    int th_id, nthreads;
    #pragma omp parallel private(th_id) shared(nthreads)
    {
        th_id = omp_get_thread_num();
        #pragma omp critical
        {
            cout << "Hello World from thread " << th_id << '\n';
        }
        #pragma omp barrier

        #pragma omp master
        {
            nthreads = omp_get_num_threads();
            cout << "There are " << nthreads << " threads" << '\n';
        }
    }

    return 0;
}