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- //===----------------------------------------------------------------------===////
- //
- // The LLVM Compiler Infrastructure
- //
- // This file is dual licensed under the MIT and the University of Illinois Open
- // Source Licenses. See LICENSE.TXT for details.
- //
- //===----------------------------------------------------------------------===////
- #ifndef ATOMIC_SUPPORT_H
- #define ATOMIC_SUPPORT_H
- #include "__config"
- #include "memory" // for __libcpp_relaxed_load
- #if defined(__clang__) && __has_builtin(__atomic_load_n) \
- && __has_builtin(__atomic_store_n) \
- && __has_builtin(__atomic_add_fetch) \
- && __has_builtin(__atomic_compare_exchange_n) \
- && defined(__ATOMIC_RELAXED) \
- && defined(__ATOMIC_CONSUME) \
- && defined(__ATOMIC_ACQUIRE) \
- && defined(__ATOMIC_RELEASE) \
- && defined(__ATOMIC_ACQ_REL) \
- && defined(__ATOMIC_SEQ_CST)
- # define _LIBCPP_HAS_ATOMIC_BUILTINS
- #elif !defined(__clang__) && defined(_GNUC_VER) && _GNUC_VER >= 407
- # define _LIBCPP_HAS_ATOMIC_BUILTINS
- #endif
- #if !defined(_LIBCPP_HAS_ATOMIC_BUILTINS) && !defined(_LIBCPP_HAS_NO_THREADS)
- # if defined(_MSC_VER) && !defined(__clang__)
- _LIBCPP_WARNING("Building libc++ without __atomic builtins is unsupported")
- # else
- # warning Building libc++ without __atomic builtins is unsupported
- # endif
- #endif
- _LIBCPP_BEGIN_NAMESPACE_STD
- namespace {
- #if defined(_LIBCPP_HAS_ATOMIC_BUILTINS)
- enum __libcpp_atomic_order {
- _AO_Relaxed = __ATOMIC_RELAXED,
- _AO_Consume = __ATOMIC_CONSUME,
- _AO_Acquire = __ATOMIC_ACQUIRE,
- _AO_Release = __ATOMIC_RELEASE,
- _AO_Acq_Rel = __ATOMIC_ACQ_REL,
- _AO_Seq = __ATOMIC_SEQ_CST
- };
- template <class _ValueType, class _FromType>
- inline _LIBCPP_INLINE_VISIBILITY
- void __libcpp_atomic_store(_ValueType* __dest, _FromType __val,
- int __order = _AO_Seq)
- {
- __atomic_store_n(__dest, __val, __order);
- }
- template <class _ValueType, class _FromType>
- inline _LIBCPP_INLINE_VISIBILITY
- void __libcpp_relaxed_store(_ValueType* __dest, _FromType __val)
- {
- __atomic_store_n(__dest, __val, _AO_Relaxed);
- }
- template <class _ValueType>
- inline _LIBCPP_INLINE_VISIBILITY
- _ValueType __libcpp_atomic_load(_ValueType const* __val,
- int __order = _AO_Seq)
- {
- return __atomic_load_n(__val, __order);
- }
- template <class _ValueType, class _AddType>
- inline _LIBCPP_INLINE_VISIBILITY
- _ValueType __libcpp_atomic_add(_ValueType* __val, _AddType __a,
- int __order = _AO_Seq)
- {
- return __atomic_add_fetch(__val, __a, __order);
- }
- template <class _ValueType>
- inline _LIBCPP_INLINE_VISIBILITY
- bool __libcpp_atomic_compare_exchange(_ValueType* __val,
- _ValueType* __expected, _ValueType __after,
- int __success_order = _AO_Seq,
- int __fail_order = _AO_Seq)
- {
- return __atomic_compare_exchange_n(__val, __expected, __after, true,
- __success_order, __fail_order);
- }
- #else // !(defined(_LIBCPP_HAS_ATOMIC_BUILTINS)
- enum __libcpp_atomic_order {
- _AO_Relaxed,
- _AO_Consume,
- _AO_Acquire,
- _AO_Release,
- _AO_Acq_Rel,
- _AO_Seq
- };
- template <class _ValueType, class _FromType>
- inline _LIBCPP_INLINE_VISIBILITY
- void __libcpp_atomic_store(_ValueType* __dest, _FromType __val,
- int = 0)
- {
- *__dest = __val;
- }
- template <class _ValueType, class _FromType>
- inline _LIBCPP_INLINE_VISIBILITY
- void __libcpp_relaxed_store(_ValueType* __dest, _FromType __val)
- {
- *__dest = __val;
- }
- template <class _ValueType>
- inline _LIBCPP_INLINE_VISIBILITY
- _ValueType __libcpp_atomic_load(_ValueType const* __val,
- int = 0)
- {
- return *__val;
- }
- template <class _ValueType, class _AddType>
- inline _LIBCPP_INLINE_VISIBILITY
- _ValueType __libcpp_atomic_add(_ValueType* __val, _AddType __a,
- int = 0)
- {
- return *__val += __a;
- }
- template <class _ValueType>
- inline _LIBCPP_INLINE_VISIBILITY
- bool __libcpp_atomic_compare_exchange(_ValueType* __val,
- _ValueType* __expected, _ValueType __after,
- int = 0, int = 0)
- {
- if (*__val == *__expected) {
- *__val = __after;
- return true;
- }
- *__expected = *__val;
- return false;
- }
- #endif // _LIBCPP_HAS_ATOMIC_BUILTINS
- } // end namespace
- _LIBCPP_END_NAMESPACE_STD
- #endif // ATOMIC_SUPPORT_H
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