整理

include/boost/atomic/detail/ops_gcc_arm_common.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) 2009 Helge Bahmann
+ * Copyright (c) 2013 Tim Blechmann
+ * Copyright (c) 2014 Andrey Semashev
+ */
+/*!
+ * \file   atomic/detail/ops_gcc_arm_common.hpp
+ *
+ * This header contains basic utilities for gcc ARM backend.
+ */
+
+#ifndef BOOST_ATOMIC_DETAIL_OPS_GCC_ARM_COMMON_HPP_INCLUDED_
+#define BOOST_ATOMIC_DETAIL_OPS_GCC_ARM_COMMON_HPP_INCLUDED_
+
+#include <cstdint>
+#include <boost/memory_order.hpp>
+#include <boost/atomic/detail/config.hpp>
+#include <boost/atomic/detail/fence_arch_operations.hpp>
+#include <boost/atomic/detail/header.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+namespace atomics {
+namespace detail {
+
+struct core_arch_operations_gcc_arm_base
+{
+    static constexpr bool full_cas_based = false;
+    static constexpr bool is_always_lock_free = true;
+
+    static BOOST_FORCEINLINE void fence_before(memory_order order) noexcept
+    {
+        if ((static_cast< unsigned int >(order) & static_cast< unsigned int >(memory_order_release)) != 0u)
+            fence_arch_operations::hardware_full_fence();
+    }
+
+    static BOOST_FORCEINLINE void fence_after(memory_order order) noexcept
+    {
+        if ((static_cast< unsigned int >(order) & (static_cast< unsigned int >(memory_order_consume) | static_cast< unsigned int >(memory_order_acquire))) != 0u)
+            fence_arch_operations::hardware_full_fence();
+    }
+
+    static BOOST_FORCEINLINE void fence_after_store(memory_order order) noexcept
+    {
+        if (order == memory_order_seq_cst)
+            fence_arch_operations::hardware_full_fence();
+    }
+};
+
+} // namespace detail
+} // namespace atomics
+} // namespace boost
+
+#include <boost/atomic/detail/footer.hpp>
+
+#endif // BOOST_ATOMIC_DETAIL_OPS_GCC_ARM_COMMON_HPP_INCLUDED_