mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
42 lines
1.5 KiB
C++
42 lines
1.5 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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 <__thread/support.h>
|
|
|
|
#if _LIBCPP_ABI_VERSION == 1 || !defined(_LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION)
|
|
# define NEEDS_MUTEX_DESTRUCTOR
|
|
#endif
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
#ifdef NEEDS_MUTEX_DESTRUCTOR
|
|
class _LIBCPP_EXPORTED_FROM_ABI mutex {
|
|
__libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER;
|
|
|
|
public:
|
|
_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI constexpr mutex() = default;
|
|
mutex(const mutex&) = delete;
|
|
mutex& operator=(const mutex&) = delete;
|
|
~mutex() noexcept;
|
|
};
|
|
|
|
mutex::~mutex() noexcept { __libcpp_mutex_destroy(&__m_); }
|
|
#endif // !NEEDS_MUTEX_DESTRUCTOR
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|