memory_order.hpp
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00001 #ifndef BOOST_MEMORY_ORDER_HPP_INCLUDED
00002 #define BOOST_MEMORY_ORDER_HPP_INCLUDED
00003 
00004 // MS compatible compilers support #pragma once
00005 
00006 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
00007 # pragma once
00008 #endif
00009 
00010 //  boost/memory_order.hpp
00011 //
00012 //  Defines enum boost::memory_order per the C++0x working draft
00013 //
00014 //  Copyright (c) 2008, 2009 Peter Dimov
00015 //
00016 //  Distributed under the Boost Software License, Version 1.0.
00017 //  See accompanying file LICENSE_1_0.txt or copy at
00018 //  http://www.boost.org/LICENSE_1_0.txt)
00019 
00020 
00021 namespace boost
00022 {
00023 
00024 //
00025 // Enum values are chosen so that code that needs to insert
00026 // a trailing fence for acquire semantics can use a single
00027 // test such as:
00028 //
00029 // if( mo & memory_order_acquire ) { ...fence... }
00030 //
00031 // For leading fences one can use:
00032 //
00033 // if( mo & memory_order_release ) { ...fence... }
00034 //
00035 // Architectures such as Alpha that need a fence on consume
00036 // can use:
00037 //
00038 // if( mo & ( memory_order_acquire | memory_order_consume ) ) { ...fence... }
00039 //
00040 
00041 enum memory_order
00042 {
00043     memory_order_relaxed = 0,
00044     memory_order_acquire = 1,
00045     memory_order_release = 2,
00046     memory_order_acq_rel = 3, // acquire | release
00047     memory_order_seq_cst = 7, // acq_rel | 4
00048     memory_order_consume = 8
00049 };
00050 
00051 } // namespace boost
00052 
00053 #endif // #ifndef BOOST_MEMORY_ORDER_HPP_INCLUDED


rosatomic
Author(s): Josh Faust
autogenerated on Mon Oct 6 2014 06:54:49