int main()
{
  {
    m.lock();
    boost::thread t(f1);
    time_point t2 = Clock::now();
    boost::this_thread::sleep_for(ms(250));
    time_point t3 = Clock::now();
    m.unlock();
    t.join();

    ns sleep_time = t3 - t2;
    ns d_ns = t1 - t0 - sleep_time;
    ms d_ms = boost::chrono::duration_cast<boost::chrono::milliseconds>(d_ns);
    // BOOST_TEST_GE(d_ms.count(), 0);
    BOOST_THREAD_TEST_IT(d_ms, max_diff);
    BOOST_THREAD_TEST_IT(d_ns, ns(max_diff));
  }
  {
    m.lock();
    boost::thread t(f2);
    boost::this_thread::sleep_for(ms(750));
    m.unlock();
    t.join();
  }

  return boost::report_errors();
}

int main()
{
  m.lock();
  boost::thread t(f);
#if defined BOOST_THREAD_USES_CHRONO
  boost::this_thread::sleep_for(ms(250));
#else
#endif
  m.unlock();
  t.join();

  return boost::report_errors();
}

void f()
{
#if defined BOOST_THREAD_USES_CHRONO
  t0 = Clock::now();
  m.lock();
  t1 = Clock::now();
  m.unlock();
#else
  //time_point t0 = Clock::now();
  m.lock();
  //time_point t1 = Clock::now();
  m.unlock();
  //ns d = t1 - t0 - ms(250);
  //BOOST_TEST(d < max_diff);
#endif
}

void f2()
{
  time_point t0 = Clock::now();
  BOOST_TEST(m.try_lock_until(Clock::now() + ms(250)) == false);
  time_point t1 = Clock::now();
  ns d = t1 - t0 - ms(250);
  // This test is spurious as it depends on the time the thread system switches the threads
  BOOST_TEST(d < ns(5000000)+ms(1000)); // within 5ms
}

int main()
{
  {
    m.lock();
    boost::thread t(f1);
    boost::this_thread::sleep_for(ms(250));
    m.unlock();
    t.join();
  }
  {
    m.lock();
    boost::thread t(f2);
    boost::this_thread::sleep_for(ms(300)+ms(1000));
    m.unlock();
    t.join();
  }

  return boost::report_errors();
}

void f()
{
#if defined BOOST_THREAD_USES_CHRONO
  time_point t0 = Clock::now();
  m.lock();
  time_point t1 = Clock::now();
  m.unlock();
  ns d = t1 - t0 - ms(250);
  // This test is spurious as it depends on the time the thread system switches the threads
  BOOST_TEST(d < ns(2500000)+ms(1000)); // within 2.5ms
#else
  //time_point t0 = Clock::now();
  m.lock();
  //time_point t1 = Clock::now();
  m.unlock();
  //ns d = t1 - t0 - ms(250);
  // This test is spurious as it depends on the time the thread system switches the threads
  //BOOST_TEST(d < ns(2500000)+ms(1000)); // within 2.5ms
#endif
}

void basic_examples()
{
    std::cout << "Running basic examples\n";
    using namespace boost;
    using namespace boost::chrono;
    system_clock::time_point time_limit = system_clock::now() + seconds(4) + milliseconds(500);
    this_thread::sleep_for(seconds(3));
    this_thread::sleep_for(nanoseconds(300));
    this_thread::sleep_until(time_limit);
//    this_thread::sleep_for(time_limit);  // desired compile-time error
//    this_thread::sleep_until(seconds(3)); // desired compile-time error
    mut.try_lock_for(milliseconds(30));
    mut.try_lock_until(time_limit);
//    mut.try_lock_for(time_limit);        // desired compile-time error
//    mut.try_lock_until(milliseconds(30)); // desired compile-time error
    cv.wait_for(m, minutes(1));    // real code would put this in a loop
    cv.wait_until(m, time_limit);  // real code would put this in a loop
    // For those who prefer floating point
    this_thread::sleep_for(duration<double>(0.25));
    this_thread::sleep_until(system_clock::now() + duration<double>(1.5));
}