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 21 template <class _Mutex> _LIBCPP_THREAD_SAFETY_ANNOTATION(scoped_lockable)22class _LIBCPP_TEMPLATE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(scoped_lockable) lock_guard { 23 public: 24 typedef _Mutex mutex_type; 25 26 private: 27 mutex_type& __m_; 28 29 public: 30 _LIBCPP_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 _LIBCPP_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