| //===--------------------- mutex_destructor.cpp ---------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // Define ~mutex. |
| // |
| // On some platforms ~mutex has been made trivial and the definition is only |
| // provided for ABI compatibility. |
| // |
| // In order to avoid ODR violations within libc++ itself, we need to ensure |
| // that *nothing* sees the non-trivial mutex declaration. For this reason |
| // we re-declare the entire class in this file instead of using |
| // _LIBCPP_BUILDING_LIBRARY to change the definition in the headers. |
| |
| #include "__config" |
| #include "__threading_support" |
| |
| #if !defined(_LIBCPP_HAS_NO_THREADS) |
| #if _LIBCPP_ABI_VERSION == 1 || !defined(_LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION) |
| #define NEEDS_MUTEX_DESTRUCTOR |
| #endif |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #ifdef NEEDS_MUTEX_DESTRUCTOR |
| class _LIBCPP_TYPE_VIS mutex |
| { |
| __libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER; |
| |
| public: |
| _LIBCPP_ALWAYS_INLINE _LIBCPP_INLINE_VISIBILITY |
| constexpr mutex() = default; |
| mutex(const mutex&) = delete; |
| mutex& operator=(const mutex&) = delete; |
| ~mutex() noexcept; |
| }; |
| |
| |
| mutex::~mutex() noexcept |
| { |
| __libcpp_mutex_destroy(&__m_); |
| } |
| |
| #endif // !_LIBCPP_HAS_NO_THREADS |
| _LIBCPP_END_NAMESPACE_STD |