72e1037c32
The thread safety annotations on std::scoped_lock were previously only applied to the empty and single-mutex specializations. The general variadic specialization carried no annotations, so -Wthread-safety considered none of the mutexes held inside a multi-mutex scoped_lock block and reported the guarded data accessed there as unprotected. Now that Clang supports pack expansion inside thread safety attributes (landed for Clang 21), annotate the variadic scoped_lock with acquire_capability/requires_capability on its constructors, release_capability on its destructor, and scoped_lockable on the class. Fixes #42000. Co-authored-by: Anthony Calandra <anthony@anthony-calandra.com>
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___MUTEX_MUTEX_H
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#define _LIBCPP___MUTEX_MUTEX_H
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#include <__config>
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#include <__thread/support.h>
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#include <__type_traits/is_nothrow_constructible.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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#if _LIBCPP_HAS_THREADS
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_LIBCPP_BEGIN_NAMESPACE_STD
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_LIBCPP_BEGIN_EXPLICIT_ABI_ANNOTATIONS
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class _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_CAPABILITY("mutex") mutex {
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__libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER;
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public:
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR mutex() = default;
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mutex(const mutex&) = delete;
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mutex& operator=(const mutex&) = delete;
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# if _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION
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_LIBCPP_HIDE_FROM_ABI ~mutex() = default;
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# else
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~mutex() _NOEXCEPT;
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# endif
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_LIBCPP_ACQUIRE_CAPABILITY() void lock();
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[[__nodiscard__]] _LIBCPP_TRY_ACQUIRE_CAPABILITY(true) bool try_lock() _NOEXCEPT;
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_LIBCPP_RELEASE_CAPABILITY() void unlock() _NOEXCEPT;
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typedef __libcpp_mutex_t* native_handle_type;
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[[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() { return &__m_; }
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};
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static_assert(is_nothrow_default_constructible<mutex>::value, "the default constructor for std::mutex must be nothrow");
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_LIBCPP_END_EXPLICIT_ABI_ANNOTATIONS
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_HAS_THREADS
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#endif // _LIBCPP___MUTEX_MUTEX_H
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