update sources to v12.2.3

[ceph.git] / ceph / src / boost / libs / thread / test / sync / mutual_exclusion / null_mutex / try_lock_pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// Copyright (C) 2011 Vicente J. Botet Escriba
//
//  Distributed under the Boost Software License, Version 1.0. (See accompanying
//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

// <boost/thread/null_mutex.hpp>

// class null_mutex;

// bool try_lock();

#include <boost/thread/null_mutex.hpp>
#include <boost/thread/thread.hpp>
#include <boost/detail/lightweight_test.hpp>



boost::null_mutex m;

#if defined BOOST_THREAD_USES_CHRONO
typedef boost::chrono::system_clock Clock;
typedef Clock::time_point time_point;
typedef Clock::duration duration;
typedef boost::chrono::milliseconds ms;
typedef boost::chrono::nanoseconds ns;
#else
#endif

void f()
{
#if defined BOOST_THREAD_USES_CHRONO
  time_point t0 = Clock::now();
  BOOST_TEST(m.try_lock());
  time_point t1 = Clock::now();
  BOOST_TEST(m.try_lock());
  m.unlock();
  m.unlock();
  ns d = t1 - t0;
  // This test is spurious as it depends on the time the thread system switches the threads
  BOOST_TEST(d < ns(50000000)); // within 50ms
#else
  BOOST_TEST(m.try_lock());
  BOOST_TEST(m.try_lock());
  m.unlock();
  m.unlock();
#endif
}

int main()
{
  m.lock();
  boost::thread t(f);
  m.unlock();
  t.join();

  return boost::report_errors();
}