#include <unistd.h>

#include <iostream>
#include <thread>
#include <memory>

using namespace std;

void sleep_spin(int delay) {
  for (int i = 0; i < 4; i++) {
    cout << "  sleep_spin(" << delay << ") sleeping..." << endl;
    sleep(delay);
    cout << "  sleep_spin(" << delay << ") done sleeping." << endl;
  }
}

void thread_start(int delay) {
  cout << "[child thread] I'm alive!" << endl;
  cout << "[child thread] calling sleep_spin(" << delay << ")" << endl;
  sleep_spin(delay);
  cout << "[child thread] done." << endl;
}

int main(int argc, char **argv) {

  cout << "[parent thread] about to create thread..." << endl;
  
  // Create a child thread, passing it 1 as its argument.
  thread tr = thread(thread_start, 1);

  // wait for thread to finish
  tr.join();
  cout << "[parent thread] joined thread" << endl;

  // do it again, but this time detach from thread
  thread tr2 = thread(thread_start, 1);
  tr2.detach();

  cout << "[parent thread] done." << endl;

  return EXIT_SUCCESS;
}