| Eric Fiselier | c6e4669 | 2015-07-07 00:27:16 +0000 | [diff] [blame] | 1 | #ifndef ATOMIC_SUPPORT_H |
| 2 | #define ATOMIC_SUPPORT_H |
| 3 | |
| 4 | #include "__config" |
| 5 | #include "memory" // for __libcpp_relaxed_load |
| 6 | |
| 7 | #if defined(__clang__) && __has_builtin(__atomic_load_n) \ |
| 8 | && __has_builtin(__atomic_store_n) \ |
| 9 | && __has_builtin(__atomic_add_fetch) \ |
| 10 | && __has_builtin(__atomic_compare_exchange_n) \ |
| 11 | && defined(__ATOMIC_RELAXED) \ |
| 12 | && defined(__ATOMIC_CONSUME) \ |
| 13 | && defined(__ATOMIC_ACQUIRE) \ |
| 14 | && defined(__ATOMIC_RELEASE) \ |
| 15 | && defined(__ATOMIC_ACQ_REL) \ |
| 16 | && defined(__ATOMIC_SEQ_CST) |
| 17 | # define _LIBCPP_HAS_ATOMIC_BUILTINS |
| 18 | #elif !defined(__clang__) && defined(_GNUC_VER) && _GNUC_VER >= 407 |
| 19 | # define _LIBCPP_HAS_ATOMIC_BUILTINS |
| 20 | #endif |
| 21 | |
| 22 | #if !defined(_LIBCPP_HAS_ATOMIC_BUILTINS) && !defined(_LIBCPP_HAS_NO_THREADS) |
| 23 | # if defined(_MSC_VER) && !defined(__clang__) |
| 24 | _LIBCPP_WARNING("Building libc++ without __atomic builtins is unsupported") |
| 25 | # else |
| 26 | # warning Building libc++ without __atomic builtins is unsupported |
| 27 | # endif |
| 28 | #endif |
| 29 | |
| 30 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 31 | |
| 32 | namespace { |
| 33 | |
| 34 | #if defined(_LIBCPP_HAS_ATOMIC_BUILTINS) && !defined(_LIBCPP_HAS_NO_THREADS) |
| 35 | |
| 36 | enum __libcpp_atomic_order { |
| 37 | _AO_Relaxed = __ATOMIC_RELAXED, |
| 38 | _AO_Consume = __ATOMIC_CONSUME, |
| 39 | _AO_Aquire = __ATOMIC_ACQUIRE, |
| 40 | _AO_Release = __ATOMIC_RELEASE, |
| 41 | _AO_Acq_Rel = __ATOMIC_ACQ_REL, |
| 42 | _AO_Seq = __ATOMIC_SEQ_CST |
| 43 | }; |
| 44 | |
| 45 | template <class _ValueType, class _FromType> |
| 46 | inline _LIBCPP_INLINE_VISIBILITY |
| 47 | void __libcpp_atomic_store(_ValueType* __dest, _FromType __val, |
| 48 | int __order = _AO_Seq) |
| 49 | { |
| 50 | __atomic_store_n(__dest, __val, __order); |
| 51 | } |
| 52 | |
| 53 | template <class _ValueType, class _FromType> |
| 54 | inline _LIBCPP_INLINE_VISIBILITY |
| 55 | void __libcpp_relaxed_store(_ValueType* __dest, _FromType __val) |
| 56 | { |
| 57 | __atomic_store_n(__dest, __val, _AO_Relaxed); |
| 58 | } |
| 59 | |
| 60 | template <class _ValueType> |
| 61 | inline _LIBCPP_INLINE_VISIBILITY |
| 62 | _ValueType __libcpp_atomic_load(_ValueType const* __val, |
| 63 | int __order = _AO_Seq) |
| 64 | { |
| 65 | return __atomic_load_n(__val, __order); |
| 66 | } |
| 67 | |
| 68 | template <class _ValueType, class _AddType> |
| 69 | inline _LIBCPP_INLINE_VISIBILITY |
| 70 | _ValueType __libcpp_atomic_add(_ValueType* __val, _AddType __a, |
| 71 | int __order = _AO_Seq) |
| 72 | { |
| 73 | return __atomic_add_fetch(__val, __a, __order); |
| 74 | } |
| 75 | |
| 76 | template <class _ValueType> |
| 77 | inline _LIBCPP_INLINE_VISIBILITY |
| 78 | bool __libcpp_atomic_compare_exchange(_ValueType* __val, |
| 79 | _ValueType* __expected, _ValueType __after, |
| 80 | int __success_order = _AO_Seq, |
| 81 | int __fail_order = _AO_Seq) |
| 82 | { |
| 83 | return __atomic_compare_exchange_n(__val, __expected, __after, true, |
| 84 | __success_order, __fail_order); |
| 85 | } |
| 86 | |
| 87 | #else // _LIBCPP_HAS_NO_THREADS |
| 88 | |
| 89 | enum __libcpp_atomic_order { |
| 90 | _AO_Relaxed, |
| 91 | _AO_Consume, |
| 92 | _AO_Acquire, |
| 93 | _AO_Release, |
| 94 | _AO_Acq_Rel, |
| 95 | _AO_Seq |
| 96 | }; |
| 97 | |
| 98 | template <class _ValueType, class _FromType> |
| 99 | inline _LIBCPP_INLINE_VISIBILITY |
| 100 | void __libcpp_atomic_store(_ValueType* __dest, _FromType __val, |
| 101 | int = 0) |
| 102 | { |
| 103 | *__dest = __val; |
| 104 | } |
| 105 | |
| Eric Fiselier | c6e4669 | 2015-07-07 00:27:16 +0000 | [diff] [blame] | 106 | template <class _ValueType> |
| 107 | inline _LIBCPP_INLINE_VISIBILITY |
| 108 | _ValueType __libcpp_atomic_load(_ValueType const* __val, |
| 109 | int = 0) |
| 110 | { |
| 111 | return *__val; |
| 112 | } |
| 113 | |
| 114 | template <class _ValueType, class _AddType> |
| 115 | inline _LIBCPP_INLINE_VISIBILITY |
| 116 | _ValueType __libcpp_atomic_add(_ValueType* __val, _AddType __a, |
| 117 | int = 0) |
| 118 | { |
| 119 | return *__val += __a; |
| 120 | } |
| 121 | |
| 122 | template <class _ValueType> |
| 123 | inline _LIBCPP_INLINE_VISIBILITY |
| 124 | bool __libcpp_atomic_compare_exchange(_ValueType* __val, |
| 125 | _ValueType* __expected, _ValueType __after, |
| 126 | int = 0, int = 0) |
| 127 | { |
| 128 | if (*__val == *__expected) { |
| 129 | *__val = __after; |
| 130 | return true; |
| 131 | } |
| 132 | *__expected = *__val; |
| 133 | return false; |
| 134 | } |
| 135 | |
| 136 | #endif // _LIBCPP_HAS_NO_THREADS |
| 137 | |
| 138 | } // end namespace |
| 139 | |
| 140 | _LIBCPP_END_NAMESPACE_STD |
| 141 | |
| 142 | #endif // ATOMIC_SUPPORT_H |