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- /*
- * 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_emulated.hpp
- *
- * This header contains lockpool-based implementation of the \c operations template.
- */
- #ifndef BOOST_ATOMIC_DETAIL_OPS_EMULATED_HPP_INCLUDED_
- #define BOOST_ATOMIC_DETAIL_OPS_EMULATED_HPP_INCLUDED_
- #include <cstddef>
- #include <boost/memory_order.hpp>
- #include <boost/atomic/detail/config.hpp>
- #include <boost/atomic/detail/storage_type.hpp>
- #include <boost/atomic/detail/operations_fwd.hpp>
- #include <boost/atomic/detail/lockpool.hpp>
- #include <boost/atomic/capabilities.hpp>
- #ifdef BOOST_HAS_PRAGMA_ONCE
- #pragma once
- #endif
- namespace boost {
- namespace atomics {
- namespace detail {
- template< std::size_t Size, bool Signed >
- struct emulated_operations
- {
- typedef typename make_storage_type< Size >::type storage_type;
- typedef typename make_storage_type< Size >::aligned aligned_storage_type;
- static BOOST_CONSTEXPR_OR_CONST std::size_t storage_size = Size;
- static BOOST_CONSTEXPR_OR_CONST bool is_signed = Signed;
- static BOOST_CONSTEXPR_OR_CONST bool full_cas_based = false;
- static BOOST_CONSTEXPR_OR_CONST bool is_always_lock_free = false;
- static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
- {
- lockpool::scoped_lock lock(&storage);
- const_cast< storage_type& >(storage) = v;
- }
- static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order) BOOST_NOEXCEPT
- {
- lockpool::scoped_lock lock(&storage);
- return const_cast< storage_type const& >(storage);
- }
- static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
- {
- storage_type& s = const_cast< storage_type& >(storage);
- lockpool::scoped_lock lock(&storage);
- storage_type old_val = s;
- s += v;
- return old_val;
- }
- static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
- {
- storage_type& s = const_cast< storage_type& >(storage);
- lockpool::scoped_lock lock(&storage);
- storage_type old_val = s;
- s -= v;
- return old_val;
- }
- static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
- {
- storage_type& s = const_cast< storage_type& >(storage);
- lockpool::scoped_lock lock(&storage);
- storage_type old_val = s;
- s = v;
- return old_val;
- }
- static BOOST_FORCEINLINE bool compare_exchange_strong(
- storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order, memory_order) BOOST_NOEXCEPT
- {
- storage_type& s = const_cast< storage_type& >(storage);
- lockpool::scoped_lock lock(&storage);
- storage_type old_val = s;
- const bool res = old_val == expected;
- if (res)
- s = desired;
- expected = old_val;
- return res;
- }
- static BOOST_FORCEINLINE bool compare_exchange_weak(
- storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order, memory_order) BOOST_NOEXCEPT
- {
- // Note: This function is the exact copy of compare_exchange_strong. The reason we're not just forwarding the call
- // is that MSVC-12 ICEs in this case.
- storage_type& s = const_cast< storage_type& >(storage);
- lockpool::scoped_lock lock(&storage);
- storage_type old_val = s;
- const bool res = old_val == expected;
- if (res)
- s = desired;
- expected = old_val;
- return res;
- }
- static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
- {
- storage_type& s = const_cast< storage_type& >(storage);
- lockpool::scoped_lock lock(&storage);
- storage_type old_val = s;
- s &= v;
- return old_val;
- }
- static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
- {
- storage_type& s = const_cast< storage_type& >(storage);
- lockpool::scoped_lock lock(&storage);
- storage_type old_val = s;
- s |= v;
- return old_val;
- }
- static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
- {
- storage_type& s = const_cast< storage_type& >(storage);
- lockpool::scoped_lock lock(&storage);
- storage_type old_val = s;
- s ^= v;
- 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
- {
- store(storage, (storage_type)0, order);
- }
- };
- template< std::size_t Size, bool Signed >
- struct operations :
- public emulated_operations< Size, Signed >
- {
- };
- } // namespace detail
- } // namespace atomics
- } // namespace boost
- #endif // BOOST_ATOMIC_DETAIL_OPS_EMULATED_HPP_INCLUDED_
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