54 lines
1.2 KiB
C++
54 lines
1.2 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... }
|
||
|
|
//
|
||
|
|
|
||
|
|
enum memory_order
|
||
|
|
{
|
||
|
|
memory_order_relaxed = 0,
|
||
|
|
memory_order_acquire = 1,
|
||
|
|
memory_order_release = 2,
|
||
|
|
memory_order_acq_rel = 3, // acquire | release
|
||
|
|
memory_order_seq_cst = 7, // acq_rel | 4
|
||
|
|
memory_order_consume = 8
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace boost
|
||
|
|
|
||
|
|
#endif // #ifndef BOOST_MEMORY_ORDER_HPP_INCLUDED
|