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 #ifndef _LIBCPP_HAS_NO_THREADS 20 21 _LIBCPP_BEGIN_NAMESPACE_STD 22 23 template <class _Mutex> 24 class _LIBCPP_TEMPLATE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(scoped_lockable) lock_guard { 25 public: 26 typedef _Mutex mutex_type; 27 28 private: 29 mutex_type& __m_; 30 31 public: 32 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI explicit lock_guard(mutex_type& __m) 33 _LIBCPP_THREAD_SAFETY_ANNOTATION(acquire_capability(__m)) 34 : __m_(__m) { 35 __m_.lock(); 36 } 37 38 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI lock_guard(mutex_type& __m, adopt_lock_t) 39 _LIBCPP_THREAD_SAFETY_ANNOTATION(requires_capability(__m)) 40 : __m_(__m) {} 41 _LIBCPP_HIDE_FROM_ABI ~lock_guard() _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability()) { __m_.unlock(); } 42 43 private: 44 lock_guard(lock_guard const&) = delete; 45 lock_guard& operator=(lock_guard const&) = delete; 46 }; 47 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(lock_guard); 48 49 _LIBCPP_END_NAMESPACE_STD 50 51 #endif // _LIBCPP_HAS_NO_THREADS 52 53 #endif // _LIBCPP___MUTEX_LOCK_GUARD_H 54