Line | Count | Source |
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 | // Define ~mutex. | |
10 | // | |
11 | // On some platforms ~mutex has been made trivial and the definition is only | |
12 | // provided for ABI compatibility. | |
13 | // | |
14 | // In order to avoid ODR violations within libc++ itself, we need to ensure | |
15 | // that *nothing* sees the non-trivial mutex declaration. For this reason | |
16 | // we re-declare the entire class in this file instead of using | |
17 | // _LIBCPP_BUILDING_LIBRARY to change the definition in the headers. | |
18 | ||
19 | #include <__config> | |
20 | #include <__threading_support> | |
21 | ||
22 | #if !defined(_LIBCPP_HAS_NO_THREADS) | |
23 | # if _LIBCPP_ABI_VERSION == 1 || !defined(_LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION) | |
24 | # define NEEDS_MUTEX_DESTRUCTOR | |
25 | # endif | |
26 | #endif | |
27 | ||
28 | _LIBCPP_BEGIN_NAMESPACE_STD | |
29 | ||
30 | #ifdef NEEDS_MUTEX_DESTRUCTOR | |
31 | class _LIBCPP_TYPE_VIS mutex | |
32 | { | |
33 | __libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER; | |
34 | ||
35 | public: | |
36 | _LIBCPP_ALWAYS_INLINE _LIBCPP_INLINE_VISIBILITY | |
37 | constexpr mutex() = default; | |
38 | mutex(const mutex&) = delete; | |
39 | mutex& operator=(const mutex&) = delete; | |
40 | ~mutex() noexcept; | |
41 | }; | |
42 | ||
43 | ||
44 | mutex::~mutex() noexcept | |
45 | 4.19k | { |
46 | 4.19k | __libcpp_mutex_destroy(&__m_); |
47 | 4.19k | } |
48 | ||
49 | #endif // !_LIBCPP_HAS_NO_THREADS | |
50 | _LIBCPP_END_NAMESPACE_STD |