| Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 1 | #ifndef BOOST_MEMORY_ORDER_HPP_INCLUDED |
| 2 | #define BOOST_MEMORY_ORDER_HPP_INCLUDED |
| 3 | |
| 4 | // MS compatible compilers support #pragma once |
| 5 | |
| 6 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
| 7 | # pragma once |
| 8 | #endif |
| 9 | |
| Jeff Thompson | 9939dcd | 2013-10-15 15:12:24 -0700 | [diff] [blame^] | 10 | // ndnboost/memory_order.hpp |
| Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 11 | // |
| 12 | // Defines enum ndnboost::memory_order per the C++0x working draft |
| 13 | // |
| 14 | // Copyright (c) 2008, 2009 Peter Dimov |
| 15 | // |
| 16 | // Distributed under the Boost Software License, Version 1.0. |
| 17 | // See accompanying file LICENSE_1_0.txt or copy at |
| 18 | // http://www.boost.org/LICENSE_1_0.txt) |
| 19 | |
| 20 | |
| 21 | namespace ndnboost |
| 22 | { |
| 23 | |
| 24 | // |
| 25 | // Enum values are chosen so that code that needs to insert |
| 26 | // a trailing fence for acquire semantics can use a single |
| 27 | // test such as: |
| 28 | // |
| 29 | // if( mo & memory_order_acquire ) { ...fence... } |
| 30 | // |
| 31 | // For leading fences one can use: |
| 32 | // |
| 33 | // if( mo & memory_order_release ) { ...fence... } |
| 34 | // |
| 35 | // Architectures such as Alpha that need a fence on consume |
| 36 | // can use: |
| 37 | // |
| 38 | // if( mo & ( memory_order_acquire | memory_order_consume ) ) { ...fence... } |
| 39 | // |
| 40 | |
| 41 | enum memory_order |
| 42 | { |
| 43 | memory_order_relaxed = 0, |
| 44 | memory_order_acquire = 1, |
| 45 | memory_order_release = 2, |
| 46 | memory_order_acq_rel = 3, // acquire | release |
| 47 | memory_order_seq_cst = 7, // acq_rel | 4 |
| 48 | memory_order_consume = 8 |
| 49 | }; |
| 50 | |
| 51 | } // namespace ndnboost |
| 52 | |
| 53 | #endif // #ifndef BOOST_MEMORY_ORDER_HPP_INCLUDED |