libcxx/include/__atomic/to_gcc_order.h

   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_TO_GCC_ORDER_H
  10 #define _LIBCPP___ATOMIC_TO_GCC_ORDER_H
  11
  12 #include <__atomic/memory_order.h>
  13 #include <__config>
  14
  15 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  16 #  pragma GCC system_header
  17 #endif
  18
  19 _LIBCPP_BEGIN_NAMESPACE_STD
  20
  21 #if defined(__ATOMIC_RELAXED) && defined(__ATOMIC_CONSUME) && defined(__ATOMIC_ACQUIRE) &&                             \
  22     defined(__ATOMIC_RELEASE) && defined(__ATOMIC_ACQ_REL) && defined(__ATOMIC_SEQ_CST)
  23
  24 _LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR int __to_gcc_order(memory_order __order) {
  25   // Avoid switch statement to make this a constexpr.
  26   return __order == memory_order_relaxed
  27            ? __ATOMIC_RELAXED
  28            : (__order == memory_order_acquire
  29                   ? __ATOMIC_ACQUIRE
  30                   : (__order == memory_order_release
  31                          ? __ATOMIC_RELEASE
  32                          : (__order == memory_order_seq_cst
  33                                 ? __ATOMIC_SEQ_CST
  34                                 : (__order == memory_order_acq_rel ? __ATOMIC_ACQ_REL : __ATOMIC_CONSUME))));
  35 }
  36
  37 _LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR int __to_gcc_failure_order(memory_order __order) {
  38   // Avoid switch statement to make this a constexpr.
  39   return __order == memory_order_relaxed
  40            ? __ATOMIC_RELAXED
  41            : (__order == memory_order_acquire
  42                   ? __ATOMIC_ACQUIRE
  43                   : (__order == memory_order_release
  44                          ? __ATOMIC_RELAXED
  45                          : (__order == memory_order_seq_cst
  46                                 ? __ATOMIC_SEQ_CST
  47                                 : (__order == memory_order_acq_rel ? __ATOMIC_ACQUIRE : __ATOMIC_CONSUME))));
  48 }
  49
  50 #endif
  51
  52 _LIBCPP_END_NAMESPACE_STD
  53
  54 #endif // _LIBCPP___ATOMIC_TO_GCC_ORDER_H