OpenMP Task based parallelism

omp_task.cc

#include<stdio.h>
#include<math.h>

static void do_something(int i) {
    for (int j = 0; j < 3000; ++j)
    {
        sqrt(double(i*j));
    }
}

int main(int argc, char *argv[])
{
#pragma omp parallel
#pragma omp single
    {
        for (int i = 0; i < 1000000; ++i) {
#pragma omp task
            do_something(i);
        }
    }
    return 0;
}