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author | Chanho Park <chanho61.park@samsung.com> | 2014-12-11 18:55:56 +0900 |
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committer | Chanho Park <chanho61.park@samsung.com> | 2014-12-11 18:55:56 +0900 |
commit | 08c1e93fa36a49f49325a07fe91ff92c964c2b6c (patch) | |
tree | 7a7053ceb8874b28ec4b868d4c49b500008a102e /boost/atomic/detail/ops_cas_based.hpp | |
parent | bb4dd8289b351fae6b55e303f189127a394a1edd (diff) | |
download | boost-08c1e93fa36a49f49325a07fe91ff92c964c2b6c.tar.gz boost-08c1e93fa36a49f49325a07fe91ff92c964c2b6c.tar.bz2 boost-08c1e93fa36a49f49325a07fe91ff92c964c2b6c.zip |
Imported Upstream version 1.57.0upstream/1.57.0
Diffstat (limited to 'boost/atomic/detail/ops_cas_based.hpp')
-rw-r--r-- | boost/atomic/detail/ops_cas_based.hpp | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/boost/atomic/detail/ops_cas_based.hpp b/boost/atomic/detail/ops_cas_based.hpp new file mode 100644 index 0000000000..7f8d288f7f --- /dev/null +++ b/boost/atomic/detail/ops_cas_based.hpp @@ -0,0 +1,91 @@ +/* + * 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) + * + * Copyright (c) 2014 Andrey Semashev + */ +/*! + * \file atomic/detail/ops_cas_based.hpp + * + * This header contains CAS-based implementation of the \c operations template. + */ + +#ifndef BOOST_ATOMIC_DETAIL_OPS_CAS_BASED_HPP_INCLUDED_ +#define BOOST_ATOMIC_DETAIL_OPS_CAS_BASED_HPP_INCLUDED_ + +#include <boost/memory_order.hpp> +#include <boost/atomic/detail/config.hpp> + +#ifdef BOOST_HAS_PRAGMA_ONCE +#pragma once +#endif + +namespace boost { +namespace atomics { +namespace detail { + +template< typename Base > +struct cas_based_operations : + public Base +{ + typedef typename Base::storage_type storage_type; + + static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT + { + storage_type old_val = Base::load(storage, memory_order_relaxed); + while (!Base::compare_exchange_weak(storage, old_val, old_val + v, order, memory_order_relaxed)) {} + return old_val; + } + + static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT + { + storage_type old_val = Base::load(storage, memory_order_relaxed); + while (!Base::compare_exchange_weak(storage, old_val, old_val - v, order, memory_order_relaxed)) {} + return old_val; + } + + static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT + { + storage_type old_val = Base::load(storage, memory_order_relaxed); + while (!Base::compare_exchange_weak(storage, old_val, v, order, memory_order_relaxed)) {} + return old_val; + } + + static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT + { + storage_type old_val = Base::load(storage, memory_order_relaxed); + while (!Base::compare_exchange_weak(storage, old_val, old_val & v, order, memory_order_relaxed)) {} + return old_val; + } + + static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT + { + storage_type old_val = Base::load(storage, memory_order_relaxed); + while (!Base::compare_exchange_weak(storage, old_val, old_val | v, order, memory_order_relaxed)) {} + return old_val; + } + + static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT + { + storage_type old_val = Base::load(storage, memory_order_relaxed); + while (!Base::compare_exchange_weak(storage, old_val, old_val ^ v, order, memory_order_relaxed)) {} + return old_val; + } + + static BOOST_FORCEINLINE bool test_and_set(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT + { + return !!exchange(storage, (storage_type)1, order); + } + + static BOOST_FORCEINLINE void clear(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT + { + Base::store(storage, (storage_type)0, order); + } +}; + +} // namespace detail +} // namespace atomics +} // namespace boost + +#endif // BOOST_ATOMIC_DETAIL_OPS_CAS_BASED_HPP_INCLUDED_ |