Chris@102: /*
Chris@102:  * Distributed under the Boost Software License, Version 1.0.
Chris@102:  * (See accompanying file LICENSE_1_0.txt or copy at
Chris@102:  * http://www.boost.org/LICENSE_1_0.txt)
Chris@102:  *
Chris@102:  * Copyright (c) 2014 Andrey Semashev
Chris@102:  */
Chris@102: /*!
Chris@102:  * \file   atomic/detail/ops_emulated.hpp
Chris@102:  *
Chris@102:  * This header contains lockpool-based implementation of the \c operations template.
Chris@102:  */
Chris@102: 
Chris@102: #ifndef BOOST_ATOMIC_DETAIL_OPS_EMULATED_HPP_INCLUDED_
Chris@102: #define BOOST_ATOMIC_DETAIL_OPS_EMULATED_HPP_INCLUDED_
Chris@102: 
Chris@102: #include <boost/memory_order.hpp>
Chris@102: #include <boost/atomic/detail/config.hpp>
Chris@102: #include <boost/atomic/detail/storage_type.hpp>
Chris@102: #include <boost/atomic/detail/operations_fwd.hpp>
Chris@102: #include <boost/atomic/detail/lockpool.hpp>
Chris@102: #include <boost/atomic/capabilities.hpp>
Chris@102: 
Chris@102: #ifdef BOOST_HAS_PRAGMA_ONCE
Chris@102: #pragma once
Chris@102: #endif
Chris@102: 
Chris@102: namespace boost {
Chris@102: namespace atomics {
Chris@102: namespace detail {
Chris@102: 
Chris@102: template< typename T >
Chris@102: struct emulated_operations
Chris@102: {
Chris@102:     typedef T storage_type;
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         lockpool::scoped_lock lock(&storage);
Chris@102:         const_cast< storage_type& >(storage) = v;
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         lockpool::scoped_lock lock(&storage);
Chris@102:         return const_cast< storage_type const& >(storage);
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         storage_type& s = const_cast< storage_type& >(storage);
Chris@102:         lockpool::scoped_lock lock(&storage);
Chris@102:         storage_type old_val = s;
Chris@102:         s += v;
Chris@102:         return old_val;
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         storage_type& s = const_cast< storage_type& >(storage);
Chris@102:         lockpool::scoped_lock lock(&storage);
Chris@102:         storage_type old_val = s;
Chris@102:         s -= v;
Chris@102:         return old_val;
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         storage_type& s = const_cast< storage_type& >(storage);
Chris@102:         lockpool::scoped_lock lock(&storage);
Chris@102:         storage_type old_val = s;
Chris@102:         s = v;
Chris@102:         return old_val;
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE bool compare_exchange_strong(
Chris@102:         storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order, memory_order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         storage_type& s = const_cast< storage_type& >(storage);
Chris@102:         lockpool::scoped_lock lock(&storage);
Chris@102:         storage_type old_val = s;
Chris@102:         const bool res = old_val == expected;
Chris@102:         if (res)
Chris@102:             s = desired;
Chris@102:         expected = old_val;
Chris@102: 
Chris@102:         return res;
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE bool compare_exchange_weak(
Chris@102:         storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         return compare_exchange_strong(storage, expected, desired, success_order, failure_order);
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         storage_type& s = const_cast< storage_type& >(storage);
Chris@102:         lockpool::scoped_lock lock(&storage);
Chris@102:         storage_type old_val = s;
Chris@102:         s &= v;
Chris@102:         return old_val;
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         storage_type& s = const_cast< storage_type& >(storage);
Chris@102:         lockpool::scoped_lock lock(&storage);
Chris@102:         storage_type old_val = s;
Chris@102:         s |= v;
Chris@102:         return old_val;
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         storage_type& s = const_cast< storage_type& >(storage);
Chris@102:         lockpool::scoped_lock lock(&storage);
Chris@102:         storage_type old_val = s;
Chris@102:         s ^= v;
Chris@102:         return old_val;
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE bool test_and_set(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         return !!exchange(storage, (storage_type)1, order);
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE void clear(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         store(storage, (storage_type)0, order);
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE bool is_lock_free(storage_type const volatile&) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         return false;
Chris@102:     }
Chris@102: };
Chris@102: 
Chris@102: template< unsigned int Size, bool Signed >
Chris@102: struct operations :
Chris@102:     public emulated_operations< typename make_storage_type< Size, Signed >::type >
Chris@102: {
Chris@102: };
Chris@102: 
Chris@102: } // namespace detail
Chris@102: } // namespace atomics
Chris@102: } // namespace boost
Chris@102: 
Chris@102: #endif // BOOST_ATOMIC_DETAIL_OPS_EMULATED_HPP_INCLUDED_