Squashed 'third_party/boostorg/atomic/' content from commit 19eecf8
Change-Id: I4723a39ab79969b4c0d7b7e67a4143c4e02992ed
git-subtree-dir: third_party/boostorg/atomic
git-subtree-split: 19eecf893c665410de63ab6ebb8549f405703e80
diff --git a/include/boost/atomic/detail/ops_emulated.hpp b/include/boost/atomic/detail/ops_emulated.hpp
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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_