| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // Define ~mutex. |
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| 10 | // |
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| 11 | // On some platforms ~mutex has been made trivial and the definition is only |
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| 12 | // provided for ABI compatibility. |
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| 13 | // |
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| 14 | // In order to avoid ODR violations within libc++ itself, we need to ensure |
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| 15 | // that *nothing* sees the non-trivial mutex declaration. For this reason |
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| 16 | // we re-declare the entire class in this file instead of using |
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| 17 | // _LIBCPP_BUILDING_LIBRARY to change the definition in the headers. |
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| 18 | |
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| 19 | #include <__config> |
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| 20 | #include <__thread/support.h> |
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| 21 | |
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| 22 | #if _LIBCPP_ABI_VERSION == 1 || !defined(_LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION) |
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| 23 | # define NEEDS_MUTEX_DESTRUCTOR |
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| 24 | #endif |
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| 25 | |
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| 26 | _LIBCPP_BEGIN_NAMESPACE_STD |
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| 27 | |
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| 28 | #ifdef NEEDS_MUTEX_DESTRUCTOR |
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| 29 | class _LIBCPP_EXPORTED_FROM_ABI mutex { |
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| 30 | __libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER; |
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| 31 | |
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| 32 | public: |
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| 33 | _LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI constexpr mutex() = default; |
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| 34 | mutex(const mutex&) = delete; |
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| 35 | mutex& operator=(const mutex&) = delete; |
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| 36 | ~mutex() noexcept; |
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| 37 | }; |
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| 38 | |
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| 39 | mutex::~mutex() noexcept { __libcpp_mutex_destroy(&__m_); } |
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| 40 | #endif // !NEEDS_MUTEX_DESTRUCTOR |
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| 41 | |
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| 42 | _LIBCPP_END_NAMESPACE_STD |
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| 43 | |
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