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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_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_
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