//----------------------------------------------------
// flag2-eb.cc: flag2 + exponential backoff
//----------------------------------------------------

#include <atomic>
#include <iostream>
#include <thread>

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

using namespace std::literals;

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

const size_t N = 8;

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

class cerrojo
{
public:
    void adquirir()
    {
        auto delay = 25us;
        while (cerrado.test() || cerrado.test_and_set())
            std::this_thread::sleep_for(delay *= 2);
    }

    void liberar() { cerrado.clear(); }

private:
    std::atomic_flag cerrado;
} c;

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

void seccion_critica()
{
    std::cout << "[" << std::this_thread::get_id() << "]: ";
    for (size_t i = 0; i < 10; ++i)
        std::cout << i;
    std::cout << std::endl;
}

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

void hebra()
{
    while (true)
    {
        c.adquirir();
        seccion_critica();
        c.liberar();
    }
}

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

int main()
{
    std::jthread threads[N];

    for (auto &i : threads)
        i = std::jthread(hebra);
}

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