1// Compatibility symbols for previous versions, C++0x bits -*- C++ -*-
2
3// Copyright (C) 2013-2022 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library.  This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14// GNU General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
23// <http://www.gnu.org/licenses/>.
24
25#include <bits/c++config.h>
26
27#if __cplusplus < 201103L
28# error "compatibility-condvar-c++0x.cc must be compiled with -std=gnu++11"
29#endif
30
31#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
32
33#define condition_variable_any condition_variable_anyXX
34#include <condition_variable>
35#undef condition_variable_any
36
37// XXX GLIBCXX_ABI Deprecated
38// gcc-4.9.0
39// std::condition_variable_any replaced with std::_V2::condition_variable_any
40namespace std _GLIBCXX_VISIBILITY(default)
41{
42_GLIBCXX_BEGIN_NAMESPACE_VERSION
43  class condition_variable_any
44  {
45    condition_variable			_M_cond;
46    mutex				_M_mutex;
47
48  public:
49    condition_variable_any() noexcept;
50    ~condition_variable_any() noexcept;
51  };
52  condition_variable_any::condition_variable_any() noexcept = default;
53  condition_variable_any::~condition_variable_any() noexcept = default;
54_GLIBCXX_END_NAMESPACE_VERSION
55} // namespace std
56
57#if ! _GLIBCXX_INLINE_VERSION
58// XXX GLIBCXX_ABI Deprecated
59// gcc-12.1
60// std::condition_variable::wait changed to noexcept(false)
61#if defined(_GLIBCXX_SYMVER_GNU) && defined(_GLIBCXX_SHARED) \
62    && defined(_GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE) \
63    && defined(_GLIBCXX_HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT)
64namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
65{
66namespace
67{
68  // Pointer-to-member for private std::condition_variable::_M_cond member.
69  std::__condvar std::condition_variable::* __base_member;
70
71  template<std::__condvar std::condition_variable::*X>
72    struct cracker
73    { static std::__condvar std::condition_variable::* value; };
74
75  // Initializer for this static member also initializes __base_member.
76  template<std::__condvar std::condition_variable::*X>
77    std::__condvar std::condition_variable::*
78      cracker<X>::value = __base_member = X;
79
80  // Explicit instantiation is allowed to access the private member.
81  template class cracker<&std::condition_variable::_M_cond>;
82}
83
84struct __nothrow_wait_cv : std::condition_variable
85{
86  void wait(std::unique_lock<std::mutex>&) noexcept;
87};
88
89__attribute__((used))
90void
91__nothrow_wait_cv::wait(std::unique_lock<std::mutex>& lock) noexcept
92{
93  // In theory this could be simply this->std::condition_variable::wait(lock)
94  // but with uclibc that binds to the @GLIBCXX_3.4.11 symbol, see PR 105730.
95  (this->*__base_member).wait(*lock.mutex());
96}
97} // namespace __gnu_cxx
98
99// Export a noexcept wrapper around std::condition_variable::wait
100// with the original @GLIBCXX_3.4.11 symbol version.
101asm(
102  ".symver _ZN9__gnu_cxx17__nothrow_wait_cv4waitERSt11unique_lockISt5mutexE,"
103  "_ZNSt18condition_variable4waitERSt11unique_lockISt5mutexE@GLIBCXX_3.4.11"
104);
105#endif
106#endif
107
108#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
109