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| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef _LIBCPP___ATOMIC_MEMORY_ORDER_H |
| 10 | #define _LIBCPP___ATOMIC_MEMORY_ORDER_H |
| 11 | |
| 12 | #include <__config> |
| 13 | #include <__type_traits/is_same.h> |
| 14 | #include <__type_traits/underlying_type.h> |
| 15 | |
| 16 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 17 | # pragma GCC system_header |
| 18 | #endif |
| 19 | |
| 20 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 21 | |
| 22 | // Figure out what the underlying type for `memory_order` would be if it were |
| 23 | // declared as an unscoped enum (accounting for -fshort-enums). Use this result |
| 24 | // to pin the underlying type in C++20. |
| 25 | enum __legacy_memory_order { __mo_relaxed, __mo_consume, __mo_acquire, __mo_release, __mo_acq_rel, __mo_seq_cst }; |
| 26 | |
| 27 | using __memory_order_underlying_t _LIBCPP_NODEBUG = __underlying_type_t<__legacy_memory_order>; |
| 28 | |
| 29 | #if _LIBCPP_STD_VER >= 20 |
| 30 | |
| 31 | enum class memory_order : __memory_order_underlying_t { |
| 32 | relaxed = __mo_relaxed, |
| 33 | consume = __mo_consume, |
| 34 | acquire = __mo_acquire, |
| 35 | release = __mo_release, |
| 36 | acq_rel = __mo_acq_rel, |
| 37 | seq_cst = __mo_seq_cst |
| 38 | }; |
| 39 | |
| 40 | static_assert(is_same<__underlying_type_t<memory_order>, __memory_order_underlying_t>::value, |
| 41 | "unexpected underlying type for std::memory_order"); |
| 42 | |
| 43 | inline constexpr auto memory_order_relaxed = memory_order::relaxed; |
| 44 | inline constexpr auto memory_order_consume = memory_order::consume; |
| 45 | inline constexpr auto memory_order_acquire = memory_order::acquire; |
| 46 | inline constexpr auto memory_order_release = memory_order::release; |
| 47 | inline constexpr auto memory_order_acq_rel = memory_order::acq_rel; |
| 48 | inline constexpr auto memory_order_seq_cst = memory_order::seq_cst; |
| 49 | |
| 50 | #else |
| 51 | |
| 52 | enum memory_order { |
| 53 | memory_order_relaxed = __mo_relaxed, |
| 54 | memory_order_consume = __mo_consume, |
| 55 | memory_order_acquire = __mo_acquire, |
| 56 | memory_order_release = __mo_release, |
| 57 | memory_order_acq_rel = __mo_acq_rel, |
| 58 | memory_order_seq_cst = __mo_seq_cst, |
| 59 | }; |
| 60 | |
| 61 | #endif // _LIBCPP_STD_VER >= 20 |
| 62 | |
| 63 | _LIBCPP_END_NAMESPACE_STD |
| 64 | |
| 65 | #endif // _LIBCPP___ATOMIC_MEMORY_ORDER_H |
| 66 |
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