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Diffstat (limited to '3rdParty/Boost/src/boost/memory_order.hpp')
| -rw-r--r-- | 3rdParty/Boost/src/boost/memory_order.hpp | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/3rdParty/Boost/src/boost/memory_order.hpp b/3rdParty/Boost/src/boost/memory_order.hpp index 2524e8a..4945af6 100644 --- a/3rdParty/Boost/src/boost/memory_order.hpp +++ b/3rdParty/Boost/src/boost/memory_order.hpp @@ -11,7 +11,7 @@ // // Defines enum boost::memory_order per the C++0x working draft // -// Copyright (c) 2008 Peter Dimov +// 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 @@ -21,13 +21,31 @@ 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_seq_cst = 7, // acq_rel | 4 + memory_order_consume = 8 }; } // namespace boost |