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Subject: [Boost-commit] svn:boost r58122 - in branches/release: . boost boost/algorithm/string boost/archive boost/config boost/filesystem boost/functional/hash boost/fusion boost/graph boost/interprocess boost/intrusive boost/iostreams boost/math boost/numeric/ublas boost/program_options boost/property_tree boost/python boost/regex boost/serialization boost/signals boost/signals2 boost/spirit boost/spirit/home boost/spirit/home/karma boost/spirit/home/support boost/spirit/repository/home/qi/nonterminal boost/system boost/thread boost/tr1 boost/type_traits boost/unordered boost/utility boost/variant boost/wave doc libs libs/config libs/filesystem libs/functional/hash libs/fusion libs/graph_parallel libs/interprocess libs/intrusive libs/iostreams libs/math libs/mpl/doc/refmanual libs/mpl/doc/src/refmanual libs/numeric/ublas libs/numeric/ublas/doc libs/program_options libs/property_tree libs/python libs/regex libs/serialization libs/signals libs/signals2 libs/spirit libs/spirit/classic/example libs/spirit/doc libs/spirit/example libs/spirit/phoenix libs/spirit/test libs/spirit/test/qi libs/system libs/thread libs/thread/doc libs/timer libs/tr1 libs/type_traits libs/unordered libs/utility libs/wave more people status tools tools/boostbook tools/build/v2 tools/inspect tools/quickbook tools/regression tools/release tools/wave wiki
From: pdimov_at_[hidden]
Date: 2009-12-03 12:50:38

Next message: pdimov_at_[hidden]: "[Boost-commit] svn:boost r58123 - trunk/libs/smart_ptr/test"
Previous message: hartmut.kaiser_at_[hidden]: "[Boost-commit] svn:boost r58121 - in trunk/libs/spirit/test: . karma"

Author: pdimov
Date: 2009-12-03 12:50:37 EST (Thu, 03 Dec 2009)
New Revision: 58122
URL: http://svn.boost.org/trac/boost/changeset/58122

Log:
Merge [58094] to release.
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Text files modified:
   branches/release/boost/memory_order.hpp | 22 ++++++++++++++++++++--
   1 files changed, 20 insertions(+), 2 deletions(-)

Modified: branches/release/boost/memory_order.hpp
==============================================================================
--- branches/release/boost/memory_order.hpp (original)
+++ branches/release/boost/memory_order.hpp 2009-12-03 12:50:37 EST (Thu, 03 Dec 2009)
@@ -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

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