//---------------------------------------------------------
// pthread.cc
//---------------------------------------------------------

#include <barrier>
#include <iostream>
#include <pthread.h>
#include <string>
#include <thread>

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

using namespace std::literals;

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

const size_t N = 2;

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

pthread_barrier_t barrera;

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

void hebra(size_t yo)
{
    std::string antes = std::to_string(yo) + ": antes\n",
                despues = std::to_string(yo) + ": después\n";
    while (true)
    {
        std::cout << antes;
        pthread_barrier_wait(&barrera);
        std::cout << despues;
    }
}

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

int main()
{
    pthread_barrier_init(&barrera, NULL, N);
    for (size_t i = 0; i < N; ++i)
        std::thread(hebra, i).detach();
    std::this_thread::sleep_for(10ms);
}

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