mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-23 12:48:40 -05:00
124f5863ac
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7584 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
#ifndef BOOST_MEMORY_ORDER_HPP_INCLUDED
|
|
#define BOOST_MEMORY_ORDER_HPP_INCLUDED
|
|
|
|
// MS compatible compilers support #pragma once
|
|
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
|
|
# pragma once
|
|
#endif
|
|
|
|
// boost/memory_order.hpp
|
|
//
|
|
// Defines enum boost::memory_order per the C++0x working draft
|
|
//
|
|
// Copyright (c) 2008, 2009 Peter Dimov
|
|
//
|
|
// 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)
|
|
|
|
|
|
namespace boost
|
|
{
|
|
|
|
//
|
|
// Enum values are chosen so that code that needs to insert
|
|
// a trailing fence for acquire semantics can use a single
|
|
// test such as:
|
|
//
|
|
// if( mo & memory_order_acquire ) { ...fence... }
|
|
//
|
|
// For leading fences one can use:
|
|
//
|
|
// if( mo & memory_order_release ) { ...fence... }
|
|
//
|
|
// Architectures such as Alpha that need a fence on consume
|
|
// can use:
|
|
//
|
|
// if( mo & ( memory_order_acquire | memory_order_consume ) ) { ...fence... }
|
|
//
|
|
// The values are also in the order of increasing "strength"
|
|
// of the fences so that success/failure orders can be checked
|
|
// efficiently in compare_exchange methods.
|
|
//
|
|
|
|
enum memory_order
|
|
{
|
|
memory_order_relaxed = 0,
|
|
memory_order_consume = 1,
|
|
memory_order_acquire = 2,
|
|
memory_order_release = 4,
|
|
memory_order_acq_rel = 6, // acquire | release
|
|
memory_order_seq_cst = 14 // acq_rel | 8
|
|
};
|
|
|
|
} // namespace boost
|
|
|
|
#endif // #ifndef BOOST_MEMORY_ORDER_HPP_INCLUDED
|