//===----------------------------------------------------------------------===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

// Define ~mutex.

//

// On some platforms ~mutex has been made trivial and the definition is only

// provided for ABI compatibility.

//

// In order to avoid ODR violations within libc++ itself, we need to ensure

// that *nothing* sees the non-trivial mutex declaration. For this reason

// we re-declare the entire class in this file instead of using

// _LIBCPP_BUILDING_LIBRARY to change the definition in the headers.

#include <__config>

#include <__threading_support>

#if !defined(_LIBCPP_HAS_NO_THREADS)

#  if _LIBCPP_ABI_VERSION == 1 || !defined(_LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION)

#    define NEEDS_MUTEX_DESTRUCTOR

#  endif

#endif

_LIBCPP_BEGIN_NAMESPACE_STD

#ifdef NEEDS_MUTEX_DESTRUCTOR

class _LIBCPP_TYPE_VIS mutex

{

    __libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER;

public:

    _LIBCPP_ALWAYS_INLINE _LIBCPP_INLINE_VISIBILITY

    constexpr mutex() = default;

    mutex(const mutex&) = delete;

    mutex& operator=(const mutex&) = delete;

    ~mutex() noexcept;

};

mutex::~mutex() noexcept

{

    __libcpp_mutex_destroy(&__m_);

}

#endif // !_LIBCPP_HAS_NO_THREADS

_LIBCPP_END_NAMESPACE_STD