C++ 11 Threading test

#include <thread>
#include <iostream>


using namespace std;

void test_thread(int id)
{
    int wait = 5 -id;
    std::cout << "echo from thread " << id << " with " << wait << " delay" << std::endl;
    std::this_thread::sleep_for (std::chrono::seconds(wait));
    std::cout << "end from thread " << id << " with " << wait << " delay" << std::endl;
}
void start_thread(int concurentThreadsSupported)
{
    std::cout << "Using " << concurentThreadsSupported << " concurrent threads" << std::endl;
    std::thread * threads = new std::thread[concurentThreadsSupported];
    for (int i = 0; i < concurentThreadsSupported; ++i)
    {
        std::cout << "CREATE " << i << std::endl;
        threads[i] = std::thread(test_thread, i);
        std::cout << "CREATED " << i << std::endl;
        std::this_thread::sleep_for (std::chrono::seconds(1));
    }
    std::this_thread::sleep_for (std::chrono::seconds(concurentThreadsSupported+2));
    std::cout << "echo from thread BASE" << std::endl;
    for (int i = 0; i < concurentThreadsSupported; ++i)
    {
        std::cout << "START " << i << std::endl;
        threads[i].join();
        std::cout << "OK " << i << std::endl;
    }
    std::cout << "end from thread BASE" << std::endl;
    delete [] threads;
}

int main()
{
    unsigned concurentThreadsSupported = std::thread::hardware_concurrency();
    if(concurentThreadsSupported == 0){
        std::cout << "Can't get number of hardware threads" << std::endl;
        concurentThreadsSupported = 1;
    }
    std::cout << "echo from MAIN" << std::endl;
    start_thread(concurentThreadsSupported);
    std::cout << "end from MAIN" << std::endl;
}