c3656afdf1
This reverts commit c861fe8a71e64f3d2108c58147e7375cd9314521. Unfortunately, this use of hidden visibility attributes causes user-defined specializations of standard-library types to also be marked hidden by default, which is incorrect. See discussion thread on #131156. ...and also reverts the follow-up commits: Revert "[libc++] Add explicit ABI annotations to functions from the block runtime declared in <__functional/function.h> (#140592)" This reverts commit 3e4c9dc299c35155934688184319d391b298fff7. Revert "[libc++] Make ABI annotations explicit for windows-specific code (#140507)" This reverts commit f73287e623a6c2e4a3485832bc3e10860cd26eb5. Revert "[libc++][NFC] Replace a few "namespace std" with the correct macro (#140510)" This reverts commit 1d411f27c769a32cb22ce50b9dc4421e34fd40dd.
43 lines
1.4 KiB
C++
43 lines
1.4 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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// Define ~mutex.
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//
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// On some platforms ~mutex has been made trivial and the definition is only
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// provided for ABI compatibility.
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//
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// In order to avoid ODR violations within libc++ itself, we need to ensure
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// that *nothing* sees the non-trivial mutex declaration. For this reason
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// we re-declare the entire class in this file instead of using
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// _LIBCPP_BUILDING_LIBRARY to change the definition in the headers.
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#include <__config>
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#include <__thread/support.h>
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#if _LIBCPP_ABI_VERSION == 1 || !_LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION
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# define NEEDS_MUTEX_DESTRUCTOR
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#ifdef NEEDS_MUTEX_DESTRUCTOR
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class _LIBCPP_EXPORTED_FROM_ABI mutex {
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__libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER;
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public:
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_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI constexpr mutex() = default;
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mutex(const mutex&) = delete;
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mutex& operator=(const mutex&) = delete;
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~mutex() noexcept;
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};
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mutex::~mutex() noexcept { __libcpp_mutex_destroy(&__m_); }
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#endif // !NEEDS_MUTEX_DESTRUCTOR
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_LIBCPP_END_NAMESPACE_STD
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