#include <iostream>
#include <mutex>
#include <thread>
#include <unistd.h>
#include <vector>

std::vector<int> a;
std::mutex mutex;

void threadFunction()
{
    //std::unique_lock<std::mutex> lock(mutex);
    a.push_back(1);
    for (size_t i = 0; i < 10; i++)
    {
        a.push_back(i);
     //   a.insert(a.begin(), i);
        std::cout << std::this_thread::get_id() << ": " << a.size() << std::endl;
        sleep(1);
    }

}

int main()
{
     std::thread thr1(threadFunction);
     std::thread thr2(threadFunction);
     std::cout << "_thr1 id = " << thr1.get_id() << "_" << std::endl;
     std::cout << "_thr2 id = " << thr2.get_id() << "_" << std::endl;
     thr1.join();
     thr2.join();
     std::cout << a.size() << std::endl;
     return 0;
}