__cxx03/__atomic/to_gcc_order.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___CXX03___ATOMIC_TO_GCC_ORDER_H
0010 #define _LIBCPP___CXX03___ATOMIC_TO_GCC_ORDER_H
0011
0012 #include <__cxx03/__atomic/memory_order.h>
0013 #include <__cxx03/__config>
0014
0015 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0016 #  pragma GCC system_header
0017 #endif
0018
0019 _LIBCPP_BEGIN_NAMESPACE_STD
0020
0021 #if defined(__ATOMIC_RELAXED) && defined(__ATOMIC_CONSUME) && defined(__ATOMIC_ACQUIRE) &&                             \
0022     defined(__ATOMIC_RELEASE) && defined(__ATOMIC_ACQ_REL) && defined(__ATOMIC_SEQ_CST)
0023
0024 _LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR int __to_gcc_order(memory_order __order) {
0025   // Avoid switch statement to make this a constexpr.
0026   return __order == memory_order_relaxed
0027            ? __ATOMIC_RELAXED
0028            : (__order == memory_order_acquire
0029                   ? __ATOMIC_ACQUIRE
0030                   : (__order == memory_order_release
0031                          ? __ATOMIC_RELEASE
0032                          : (__order == memory_order_seq_cst
0033                                 ? __ATOMIC_SEQ_CST
0034                                 : (__order == memory_order_acq_rel ? __ATOMIC_ACQ_REL : __ATOMIC_CONSUME))));
0035 }
0036
0037 _LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR int __to_gcc_failure_order(memory_order __order) {
0038   // Avoid switch statement to make this a constexpr.
0039   return __order == memory_order_relaxed
0040            ? __ATOMIC_RELAXED
0041            : (__order == memory_order_acquire
0042                   ? __ATOMIC_ACQUIRE
0043                   : (__order == memory_order_release
0044                          ? __ATOMIC_RELAXED
0045                          : (__order == memory_order_seq_cst
0046                                 ? __ATOMIC_SEQ_CST
0047                                 : (__order == memory_order_acq_rel ? __ATOMIC_ACQUIRE : __ATOMIC_CONSUME))));
0048 }
0049
0050 #endif
0051
0052 _LIBCPP_END_NAMESPACE_STD
0053
0054 #endif // _LIBCPP___CXX03___ATOMIC_TO_GCC_ORDER_H