//-----------------------------------------------------------------------------
// medir-nulo.cc
//-----------------------------------------------------------------------------

#include "nulo.h"
#include <algorithm>
#include <chrono>
#include <cstring>
#include <iomanip>
#include <iostream>
#include <limits>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

//-----------------------------------------------------------------------------

template<class F> void test(F &f, const char *msg)
{
    const int n = 999, w = 7;
    std::chrono::duration<double, std::micro> rep[n];

    for (auto &r : rep)
    {
        auto start = std::chrono::high_resolution_clock::now();
        f();
        auto stop = std::chrono::high_resolution_clock::now();
        r = (stop - start);
    }

    std::nth_element(rep, rep + n / 2, rep + n);

    std::cout << msg << "  minimo: " << std::fixed << std::setprecision(2)
              << std::setw(w) << std::min_element(rep, rep + n)->count()
              << "µs"
              << "  mediana: " << std::fixed << std::setprecision(2)
              << std::setw(w) << rep[n / 2].count() << "µs"
              << "  máximo: " << std::fixed << std::setprecision(2)
              << std::setw(w) << std::max_element(rep, rep + n)->count()
              << "µs" << std::endl;
}

//-----------------------------------------------------------------------------

int main(int argc, char *argv[])
{
    test(usuario, "hebra usuario nula:");
    test(nucleo, " hebra nucleo nula:");
    test(proceso, "      proceso nulo:");
}

//-----------------------------------------------------------------------------