concurrency/ompSingle.cpp at master · acascone/concurrency · GitHub

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#include <iostream>
#include <chrono>
#include <random>
#include <vector>
#include <string>
#include <thread>
#include <omp.h>

enum class Co
{ Company1, Company2 };

int fetchTheSalary(const int employee,
                   const Co company)
{
    if (company == Co::Company1)
    {
        return (employee < 100) ? 99340 : 54300;
    }
    else
    {
        return (employee < 1000) ? 88770: 57330;
    }
}


int main()
{

    int salaries1 = 0;
    int salaries2 = 0;

    #pragma omp parallel shared(salaries1, salaries2)
    {
        #pragma omp for reduction(+: salaries1)
        for (int employee = 0; employee < 25000; employee++)
        {
            salaries1 += fetchTheSalary(employee, Co::Company1);
        }

        #pragma omp single
        {
            std::cout << "Salaries1: " << salaries1 << std::endl;
        }

        #pragma omp for reduction(+: salaries1)
        for (int employee = 0; employee < 25000; employee++)
        {
            salaries2 += fetchTheSalary(employee, Co::Company2);
        }

        #pragma omp single
        {
            std::cout << "Salaries2: " << salaries2 << std::endl;
        }
    }

    return 0;
}

// int main()
// {
//     int salaries1 = 0;
//     int salaries2 = 0;

//     #pragma omp parallel for reduction(+: salaries1, salaries2)
//     for (int employee = 0; employee < 25000; employee++)
//     {
//         salaries1 += fetchTheSalary(employee, Co::Company1);
//         salaries2 += fetchTheSalary(employee, Co::Company2);
//     }

//     std::cout << "Salaries1: " << salaries1 << "\n"
//               << "Salaries2: " << salaries2 << std::endl;

//     return 0;
// }