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 !defined(_LIBCPP_HAS_NO_THREADS)
18 # if _LIBCPP_ABI_VERSION == 1 || !defined(_LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION)
19 #   define NEEDS_CONDVAR_DESTRUCTOR
20 # endif
21 #endif
22 
23 _LIBCPP_BEGIN_NAMESPACE_STD
24 
25 #ifdef NEEDS_CONDVAR_DESTRUCTOR
26 
27 class _LIBCPP_TYPE_VIS condition_variable
28 {
29     __libcpp_condvar_t __cv_ = _LIBCPP_CONDVAR_INITIALIZER;
30 public:
31     _LIBCPP_INLINE_VISIBILITY
32     constexpr condition_variable() noexcept = default;
33 
34     ~condition_variable();
35 
36     condition_variable(const condition_variable&) = delete;
37     condition_variable& operator=(const condition_variable&)  = delete;
38 };
39 
40 condition_variable::~condition_variable()
41 {
42     __libcpp_condvar_destroy(&__cv_);
43 }
44 #endif
45 
46 _LIBCPP_END_NAMESPACE_STD
47