compatibility-thread-c++0x.cc revision 1.2 
1// Compatibility symbols for previous versions, C++0x bits -*- C++ -*-
2
3// Copyright (C) 2009-2017 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#if defined(_GLIBCXX_SHARED)
27#define _GLIBCXX_ASYNC_ABI_COMPAT
28#endif
29
30#include <future>
31#include <mutex>
32#include <functional>
33
34#if __cplusplus < 201103L
35# error "compatibility-thread-c++0x.cc must be compiled with -std=gnu++0x"
36#endif
37
38#ifdef _GLIBCXX_COMPAT_
39#define _GLIBCXX_ASM_SYMVER(cur, old, version) \
40   asm (".symver " #cur "," #old "@@@" #version);
41#else
42#define _GLIBCXX_ASM_SYMVER(cur, old, version)
43#endif
44
45// XXX GLIBCXX_ABI Deprecated
46// gcc-4.6.0
47// <future> export changes
48#if defined(_GLIBCXX_SYMVER_GNU) && defined(_GLIBCXX_SHARED) \
49    && defined(_GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE) \
50    && defined(_GLIBCXX_HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT)
51
52namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
53{
54  const std::error_category* future_category = &std::future_category();
55}
56
57_GLIBCXX_ASM_SYMVER(_ZN9__gnu_cxx15future_categoryE, _ZSt15future_category, GLIBCXX_3.4.14)
58
59#endif
60
61// XXX GLIBCXX_ABI Deprecated
62// gcc-4.6.0
63// <mutex> export changes
64#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
65#if defined(_GLIBCXX_SYMVER_GNU) && defined(_GLIBCXX_SHARED) \
66    && defined(_GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE) \
67    && defined(_GLIBCXX_HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT)
68
69namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
70{
71  std::defer_lock_t defer_lock;
72  std::try_to_lock_t try_to_lock;
73  std::adopt_lock_t adopt_lock;
74}
75
76_GLIBCXX_ASM_SYMVER(_ZN9__gnu_cxx10adopt_lockE, _ZSt10adopt_lock, GLIBCXX_3.4.11)
77_GLIBCXX_ASM_SYMVER(_ZN9__gnu_cxx10defer_lockE, _ZSt10defer_lock, GLIBCXX_3.4.11)
78_GLIBCXX_ASM_SYMVER(_ZN9__gnu_cxx11try_to_lockE, _ZSt11try_to_lock, GLIBCXX_3.4.11)
79
80
81#endif
82#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
83
84
85// XXX GLIBCXX_ABI Deprecated
86// gcc-4.7.0, gcc-4.9.0
87// <future> export changes
88#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) \
89  && (ATOMIC_INT_LOCK_FREE > 1)
90#if defined(_GLIBCXX_SHARED)
91namespace std _GLIBCXX_VISIBILITY(default)
92{
93_GLIBCXX_BEGIN_NAMESPACE_VERSION
94  // Replaced by _State_baseV2 in gcc-4.9.0
95  class __future_base::_State_base
96  {
97    typedef _Ptr<_Result_base> _Ptr_type;
98
99    _Ptr_type			_M_result;
100    mutex               	_M_mutex;
101    condition_variable  	_M_cond;
102    atomic_flag         	_M_retrieved;
103    once_flag			_M_once;
104  public:
105    virtual ~_State_base();
106    virtual void _M_run_deferred() { }
107  };
108  __future_base::_State_base::~_State_base() { }
109
110  // Replaced by _Async_state_commonV2 in gcc-4.9.0
111  class __future_base::_Async_state_common : public __future_base::_State_base
112  {
113  protected:
114    ~_Async_state_common();
115    virtual void _M_run_deferred() { _M_join(); }
116    void _M_join() { std::call_once(_M_once, &thread::join, ref(_M_thread)); }
117    thread _M_thread;
118    once_flag _M_once;
119  };
120#if defined(_GLIBCXX_HAVE_TLS)
121  // Replaced with inline definition in gcc-4.8.0
122  __future_base::_Async_state_common::~_Async_state_common() { _M_join(); }
123
124  template<typename _Tp>
125    struct _Maybe_wrap_member_pointer;
126
127  template<typename _Tp, typename _Class>
128    struct _Maybe_wrap_member_pointer<_Tp _Class::*>
129    {
130      typedef _Mem_fn<_Tp _Class::*> type;
131
132      static constexpr type
133      __do_wrap(_Tp _Class::* __pm)
134      { return type(__pm); }
135    };
136
137  template<typename _Signature>
138    struct _Bind_simple;
139
140  template<typename _Callable, typename... _Args>
141    struct _Bind_simple<_Callable(_Args...)>
142    {
143      typedef typename result_of<_Callable(_Args...)>::type result_type;
144
145      template<typename _Tp, typename... _Up>
146        explicit
147        _Bind_simple(_Tp&& __f, _Up&&... __args)
148        : _M_bound(std::forward<_Tp>(__f), std::forward<_Up>(__args)...)
149        { }
150
151      _Bind_simple(const _Bind_simple&) = default;
152      _Bind_simple(_Bind_simple&&) = default;
153
154      result_type
155      operator()()
156      {
157        typedef typename _Build_index_tuple<sizeof...(_Args)>::__type _Indices;
158        return _M_invoke(_Indices());
159      }
160
161    private:
162      template<std::size_t... _Indices>
163        typename result_of<_Callable(_Args...)>::type
164        _M_invoke(_Index_tuple<_Indices...>)
165        {
166         // std::bind always forwards bound arguments as lvalues,
167         // but this type can call functions which only accept rvalues.
168          return std::forward<_Callable>(std::get<0>(_M_bound))(
169              std::forward<_Args>(std::get<_Indices+1>(_M_bound))...);
170        }
171
172      std::tuple<_Callable, _Args...> _M_bound;
173    };
174
175  template<typename _Func, typename... _BoundArgs>
176    struct _Bind_simple_helper
177    {
178      typedef _Maybe_wrap_member_pointer<typename decay<_Func>::type>
179        __maybe_type;
180      typedef typename __maybe_type::type __func_type;
181      typedef _Bind_simple<__func_type(typename decay<_BoundArgs>::type...)>
182               __type;
183    };
184
185  // Simplified version of std::bind for internal use, without support for
186  // unbound arguments, placeholders or nested bind expressions.
187  template<typename _Callable, typename... _Args>
188    typename _Bind_simple_helper<_Callable, _Args...>::__type
189    __bind_simple(_Callable&& __callable, _Args&&... __args)
190    {
191      typedef _Bind_simple_helper<_Callable, _Args...> __helper_type;
192      typedef typename __helper_type::__maybe_type __maybe_type;
193      typedef typename __helper_type::__type __result_type;
194      return __result_type(
195          __maybe_type::__do_wrap( std::forward<_Callable>(__callable)),
196          std::forward<_Args>(__args)...);
197    }
198
199  // Explicit instantiation due to -fno-implicit-instantiation.
200  template void call_once(once_flag&, void (thread::*&&)(), reference_wrapper<thread>&&);
201  template _Bind_simple_helper<void (thread::*)(), reference_wrapper<thread>>::__type __bind_simple(void (thread::*&&)(), reference_wrapper<thread>&&);
202#endif // _GLIBCXX_HAVE_TLS
203_GLIBCXX_END_NAMESPACE_VERSION
204} // namespace std
205#endif // _GLIBCXX_SHARED
206#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
207