// Copyright (c) 2016 GeometryFactory Sarl (France)
//  All rights reserved.
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v5.1/Installation/include/CGAL/atomic.h $
// $Id: atomic.h 52164b1 2019-10-19T15:34:59+02:00 Sébastien Loriot
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial

#ifndef CGAL_ATOMIC_H
#define CGAL_ATOMIC_H

#include <CGAL/config.h>

#ifdef CGAL_HAS_THREADS

#  ifdef CGAL_CAN_USE_CXX11_ATOMIC
#    include <atomic>
#    define CGAL_ATOMIC_NS std
#  else // not CGAL_CAN_USE_CXX11_ATOMIC
#    if BOOST_VERSION >= 105300
#      include <boost/atomic.hpp>
#      define CGAL_ATOMIC_NS boost
#    else // BOOST_VERSION < 105300
#      define CGAL_NO_ATOMIC "Boost.Atomic was introduced in Boost-1.53".
#    endif // BOOST_VERSION < 105300
#  endif // not CGAL_CAN_USE_CXX11_ATOMIC

#  ifndef CGAL_NO_ATOMIC
   namespace CGAL {
     namespace cpp11 {
       using CGAL_ATOMIC_NS ::atomic;

       using CGAL_ATOMIC_NS ::memory_order_relaxed;
       using CGAL_ATOMIC_NS ::memory_order_consume;
       using CGAL_ATOMIC_NS ::memory_order_acquire;
       using CGAL_ATOMIC_NS ::memory_order_release;
       using CGAL_ATOMIC_NS ::memory_order_acq_rel;
       using CGAL_ATOMIC_NS ::memory_order_seq_cst;

       using CGAL_ATOMIC_NS ::atomic_thread_fence;
     }
   }
#  endif // CGAL_ATOMIC_NS
#else
#  define CGAL_NO_ATOMIC "No atomic because CGAL_NO_THREADS is defined."
#endif // CGAL_HAS_THREADS

#endif // CGAL_ATOMIC_H