//-----------------------------------------------------
// ballhausen.cc: justicia
//-----------------------------------------------------

#include <chrono>
#include <iostream>
#include <latch>
#include <mutex>
#include <semaphore>
#include <thread>

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

using namespace std::literals;

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

const size_t N = 24; // número de hebras

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

std::latch latch(N);
std::mutex mutex;
std::counting_semaphore acceso(N / 2);

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

void seccion_critica(char c)
{
    for (char i = 0; i < 10; ++i)
        std::cout << c;
    std::cout << '\n';
}

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

void lector(char c)
{
    latch.arrive_and_wait();
    while (true)
    {
        acceso.acquire();
        seccion_critica(c);
        acceso.release();
    }
}

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

void escritor(char c)
{
    latch.arrive_and_wait();
    while (true)
    {
        mutex.lock();
        for (size_t i = 0; i < N / 2; ++i)
            acceso.acquire();
        mutex.unlock();
        seccion_critica(c);
        for (size_t i = 0; i < N / 2; ++i)
            acceso.release();
    }
}

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

int main()
{
    for (size_t i = 0; i < N / 2; ++i)
    {
        std::thread(lector, '0' + i).detach();
        std::thread(escritor, 'a' + i).detach();
    }

    std::this_thread::sleep_for(12ms);
}

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