1349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 20b57cec5SDimitry Andric // 30b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 40b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 50b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 60b57cec5SDimitry Andric // 70b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 80b57cec5SDimitry Andric 90b57cec5SDimitry Andric // Define ~mutex. 100b57cec5SDimitry Andric // 110b57cec5SDimitry Andric // On some platforms ~mutex has been made trivial and the definition is only 120b57cec5SDimitry Andric // provided for ABI compatibility. 130b57cec5SDimitry Andric // 140b57cec5SDimitry Andric // In order to avoid ODR violations within libc++ itself, we need to ensure 150b57cec5SDimitry Andric // that *nothing* sees the non-trivial mutex declaration. For this reason 160b57cec5SDimitry Andric // we re-declare the entire class in this file instead of using 170b57cec5SDimitry Andric // _LIBCPP_BUILDING_LIBRARY to change the definition in the headers. 180b57cec5SDimitry Andric 1981ad6265SDimitry Andric #include <__config> 2081ad6265SDimitry Andric #include <__threading_support> 210b57cec5SDimitry Andric 220b57cec5SDimitry Andric #if _LIBCPP_ABI_VERSION == 1 || !defined(_LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION) 230b57cec5SDimitry Andric # define NEEDS_MUTEX_DESTRUCTOR 240b57cec5SDimitry Andric #endif 250b57cec5SDimitry Andric 260b57cec5SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 270b57cec5SDimitry Andric 280b57cec5SDimitry Andric #ifdef NEEDS_MUTEX_DESTRUCTOR 2906c3fb27SDimitry Andric class _LIBCPP_EXPORTED_FROM_ABI mutex 300b57cec5SDimitry Andric { 310b57cec5SDimitry Andric __libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER; 320b57cec5SDimitry Andric 330b57cec5SDimitry Andric public: 34*5f757f3fSDimitry Andric _LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI 350b57cec5SDimitry Andric constexpr mutex() = default; 360b57cec5SDimitry Andric mutex(const mutex&) = delete; 370b57cec5SDimitry Andric mutex& operator=(const mutex&) = delete; 380b57cec5SDimitry Andric ~mutex() noexcept; 390b57cec5SDimitry Andric }; 400b57cec5SDimitry Andric 410b57cec5SDimitry Andric 42fe6060f1SDimitry Andric mutex::~mutex() noexcept 430b57cec5SDimitry Andric { 440b57cec5SDimitry Andric __libcpp_mutex_destroy(&__m_); 450b57cec5SDimitry Andric } 46*5f757f3fSDimitry Andric #endif // !NEEDS_MUTEX_DESTRUCTOR 470b57cec5SDimitry Andric 480b57cec5SDimitry Andric _LIBCPP_END_NAMESPACE_STD 49