ceph/src/boost/boost/atomic/detail/extra_ops_generic.hpp

   1 /*
   2  * Distributed under the Boost Software License, Version 1.0.
   3  * (See accompanying file LICENSE_1_0.txt or copy at
   4  * http://www.boost.org/LICENSE_1_0.txt)
   5  *
   6  * Copyright (c) 2015 Andrey Semashev
   7  */
   8 /*!
   9  * \file   atomic/detail/extra_ops_generic.hpp
  10  *
  11  * This header contains generic implementation of the extra atomic operations.
  12  */
  13
  14 #ifndef BOOST_ATOMIC_DETAIL_EXTRA_OPS_GENERIC_HPP_INCLUDED_
  15 #define BOOST_ATOMIC_DETAIL_EXTRA_OPS_GENERIC_HPP_INCLUDED_
  16
  17 #include <cstddef>
  18 #include <boost/memory_order.hpp>
  19 #include <boost/atomic/detail/config.hpp>
  20 #include <boost/atomic/detail/storage_type.hpp>
  21 #include <boost/atomic/detail/extra_operations_fwd.hpp>
  22 #include <boost/atomic/capabilities.hpp>
  23
  24 #ifdef BOOST_HAS_PRAGMA_ONCE
  25 #pragma once
  26 #endif
  27
  28 #if defined(BOOST_MSVC)
  29 #pragma warning(push)
  30 // unary minus operator applied to unsigned type, result still unsigned
  31 #pragma warning(disable: 4146)
  32 #endif
  33
  34 namespace boost {
  35 namespace atomics {
  36 namespace detail {
  37
  38 //! Generic implementation of extra operations
  39 template< typename Base, std::size_t Size, bool Signed >
  40 struct generic_extra_operations :
  41     public Base
  42 {
  43     typedef Base base_type;
  44     typedef typename base_type::storage_type storage_type;
  45     typedef typename make_storage_type< Size, Signed >::type emulated_storage_type;
  46     typedef typename make_storage_type< Size, false >::type unsigned_emulated_storage_type;
  47
  48     static BOOST_FORCEINLINE storage_type fetch_negate(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
  49     {
  50         storage_type old_val;
  51         atomics::detail::non_atomic_load(storage, old_val);
  52         while (!Base::compare_exchange_weak(storage, old_val, static_cast< storage_type >(-static_cast< emulated_storage_type >(old_val)), order, memory_order_relaxed)) {}
  53         return old_val;
  54     }
  55
  56     static BOOST_FORCEINLINE storage_type fetch_complement(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
  57     {
  58         return Base::fetch_xor(storage, static_cast< storage_type >(~static_cast< emulated_storage_type >(0)), order);
  59     }
  60
  61     static BOOST_FORCEINLINE void opaque_add(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
  62     {
  63         Base::fetch_add(storage, v, order);
  64     }
  65
  66     static BOOST_FORCEINLINE void opaque_sub(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
  67     {
  68         Base::fetch_sub(storage, v, order);
  69     }
  70
  71     static BOOST_FORCEINLINE void opaque_negate(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
  72     {
  73         fetch_negate(storage, order);
  74     }
  75
  76     static BOOST_FORCEINLINE void opaque_and(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
  77     {
  78         Base::fetch_and(storage, v, order);
  79     }
  80
  81     static BOOST_FORCEINLINE void opaque_or(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
  82     {
  83         Base::fetch_or(storage, v, order);
  84     }
  85
  86     static BOOST_FORCEINLINE void opaque_xor(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
  87     {
  88         Base::fetch_xor(storage, v, order);
  89     }
  90
  91     static BOOST_FORCEINLINE void opaque_complement(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
  92     {
  93         fetch_complement(storage, order);
  94     }
  95
  96     static BOOST_FORCEINLINE bool add_and_test(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
  97     {
  98         storage_type old_val = Base::fetch_add(storage, v, order);
  99         emulated_storage_type new_val = static_cast< emulated_storage_type >(old_val) + static_cast< emulated_storage_type >(v);
 100         return !new_val;
 101     }
 102
 103     static BOOST_FORCEINLINE bool sub_and_test(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
 104     {
 105         storage_type old_val = Base::fetch_sub(storage, v, order);
 106         emulated_storage_type new_val = static_cast< emulated_storage_type >(old_val) - static_cast< emulated_storage_type >(v);
 107         return !new_val;
 108     }
 109
 110     static BOOST_FORCEINLINE bool and_and_test(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
 111     {
 112         return !(Base::fetch_and(storage, v, order) & v);
 113     }
 114
 115     static BOOST_FORCEINLINE bool or_and_test(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
 116     {
 117         return !(Base::fetch_or(storage, v, order) | v);
 118     }
 119
 120     static BOOST_FORCEINLINE bool xor_and_test(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
 121     {
 122         return !(Base::fetch_xor(storage, v, order) ^ v);
 123     }
 124
 125     static BOOST_FORCEINLINE bool bit_test_and_set(storage_type volatile& storage, unsigned int bit_number, memory_order order) BOOST_NOEXCEPT
 126     {
 127         storage_type mask = storage_type(((unsigned_emulated_storage_type)1u) << bit_number);
 128         storage_type old_val = Base::fetch_or(storage, mask, order);
 129         return !!(old_val & mask);
 130     }
 131
 132     static BOOST_FORCEINLINE bool bit_test_and_reset(storage_type volatile& storage, unsigned int bit_number, memory_order order) BOOST_NOEXCEPT
 133     {
 134         storage_type mask = storage_type(((unsigned_emulated_storage_type)1u) << bit_number);
 135         storage_type old_val = Base::fetch_and(storage, ~mask, order);
 136         return !!(old_val & mask);
 137     }
 138
 139     static BOOST_FORCEINLINE bool bit_test_and_complement(storage_type volatile& storage, unsigned int bit_number, memory_order order) BOOST_NOEXCEPT
 140     {
 141         storage_type mask = storage_type(((unsigned_emulated_storage_type)1u) << bit_number);
 142         storage_type old_val = Base::fetch_xor(storage, mask, order);
 143         return !!(old_val & mask);
 144     }
 145 };
 146
 147 // Default extra_operations template definition will be used unless specialized for a specific platform
 148 template< typename Base, std::size_t Size, bool Signed >
 149 struct extra_operations :
 150     public generic_extra_operations< Base, Size, Signed >
 151 {
 152 };
 153
 154 } // namespace detail
 155 } // namespace atomics
 156 } // namespace boost
 157
 158 #if defined(BOOST_MSVC)
 159 #pragma warning(pop)
 160 #endif
 161
 162 #endif // BOOST_ATOMIC_DETAIL_EXTRA_OPS_GENERIC_HPP_INCLUDED_