blob: 2038d2bbe21ad99732b8e68be6d032db5e6992b7 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
//===--------------------- 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
|
