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_SCOPED_LOCKABLE lock_guard {
23public:
24  typedef _Mutex mutex_type;
25
26private:
27  mutex_type& __m_;
28
29public:
30  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI explicit lock_guard(mutex_type& __m) _LIBCPP_ACQUIRE_CAPABILITY(__m)
31      : __m_(__m) {
32    __m_.lock();
33  }
34
35  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI lock_guard(mutex_type& __m, adopt_lock_t) _LIBCPP_REQUIRES_CAPABILITY(__m)
36      : __m_(__m) {}
37  _LIBCPP_RELEASE_CAPABILITY _LIBCPP_HIDE_FROM_ABI ~lock_guard() { __m_.unlock(); }
38
39  lock_guard(lock_guard const&)            = delete;
40  lock_guard& operator=(lock_guard const&) = delete;
41};
42_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(lock_guard);
43
44_LIBCPP_END_NAMESPACE_STD
45
46#endif // _LIBCPP___MUTEX_LOCK_GUARD_H