libcxx/src/condition_variable_destructor.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // Define ~condition_variable.
  10 //
  11 // On some platforms ~condition_variable has been made trivial and the
  12 // definition is only provided for ABI compatibility.
  13
  14 #include <__config>
  15 #include <__threading_support>
  16
  17 #if _LIBCPP_ABI_VERSION == 1 || !defined(_LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION)
  18 #  define NEEDS_CONDVAR_DESTRUCTOR
  19 #endif
  20
  21 _LIBCPP_BEGIN_NAMESPACE_STD
  22
  23 #ifdef NEEDS_CONDVAR_DESTRUCTOR
  24
  25 class _LIBCPP_EXPORTED_FROM_ABI condition_variable {
  26   __libcpp_condvar_t __cv_ = _LIBCPP_CONDVAR_INITIALIZER;
  27
  28 public:
  29   _LIBCPP_HIDE_FROM_ABI constexpr condition_variable() noexcept = default;
  30
  31   ~condition_variable();
  32
  33   condition_variable(const condition_variable&)            = delete;
  34   condition_variable& operator=(const condition_variable&) = delete;
  35 };
  36
  37 condition_variable::~condition_variable() { __libcpp_condvar_destroy(&__cv_); }
  38 #endif
  39
  40 _LIBCPP_END_NAMESPACE_STD