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#ifndef _LIBCPP___MUTEX_LOCK_GUARD_H
10#define _LIBCPP___MUTEX_LOCK_GUARD_H
11
12#include <__config>
13#include <__mutex/tag_types.h>
14
15#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
16# pragma GCC system_header
17#endif
18
19_LIBCPP_BEGIN_NAMESPACE_STD
20
21template <class _Mutex>
22class _LIBCPP_THREAD_SAFETY_ANNOTATION(scoped_lockable) lock_guard {
23public:
24 typedef _Mutex mutex_type;
25
26private:
27 mutex_type& __m_;
28
29public:
30 [[__nodiscard__]]
31 _LIBCPP_HIDE_FROM_ABI explicit lock_guard(mutex_type& __m) _LIBCPP_THREAD_SAFETY_ANNOTATION(acquire_capability(__m))
32 : __m_(__m) {
33 __m_.lock();
34 }
35
36 [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI lock_guard(mutex_type& __m, adopt_lock_t)
37 _LIBCPP_THREAD_SAFETY_ANNOTATION(requires_capability(__m))
38 : __m_(__m) {}
39 _LIBCPP_HIDE_FROM_ABI ~lock_guard() _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability()) { __m_.unlock(); }
40
41 lock_guard(lock_guard const&) = delete;
42 lock_guard& operator=(lock_guard const&) = delete;
43};
44_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(lock_guard);
45
46_LIBCPP_END_NAMESPACE_STD
47
48#endif // _LIBCPP___MUTEX_LOCK_GUARD_H
49