libstdc++-v3/src/c++11/compatibility-thread-c++0x.cc

   1 // Compatibility symbols for previous versions, C++0x bits -*- C++ -*-
   2
   3 // Copyright (C) 2009-2018 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 #define _GLIBCXX_ASM_SYMVER(cur, old, version) \
  39    asm (".symver " #cur "," #old "@@@" #version);
  40
  41 // XXX GLIBCXX_ABI Deprecated
  42 // gcc-4.6.0
  43 // <future> export changes
  44 #if defined(_GLIBCXX_SYMVER_GNU) && defined(_GLIBCXX_SHARED) \
  45     && defined(_GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE) \
  46     && defined(_GLIBCXX_HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT)
  47
  48 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
  49 {
  50   const std::error_category* future_category = &std::future_category();
  51 }
  52
  53 _GLIBCXX_ASM_SYMVER(_ZN9__gnu_cxx15future_categoryE, _ZSt15future_category, GLIBCXX_3.4.14)
  54
  55 #endif
  56
  57 // XXX GLIBCXX_ABI Deprecated
  58 // gcc-4.6.0
  59 // <mutex> export changes
  60 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
  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)
  64
  65 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
  66 {
  67   std::defer_lock_t defer_lock;
  68   std::try_to_lock_t try_to_lock;
  69   std::adopt_lock_t adopt_lock;
  70 }
  71
  72 _GLIBCXX_ASM_SYMVER(_ZN9__gnu_cxx10adopt_lockE, _ZSt10adopt_lock, GLIBCXX_3.4.11)
  73 _GLIBCXX_ASM_SYMVER(_ZN9__gnu_cxx10defer_lockE, _ZSt10defer_lock, GLIBCXX_3.4.11)
  74 _GLIBCXX_ASM_SYMVER(_ZN9__gnu_cxx11try_to_lockE, _ZSt11try_to_lock, GLIBCXX_3.4.11)
  75
  76
  77 #endif
  78 #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
  79
  80
  81 // XXX GLIBCXX_ABI Deprecated
  82 // gcc-4.7.0, gcc-4.9.0
  83 // <future> export changes
  84 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) \
  85   && (ATOMIC_INT_LOCK_FREE > 1)
  86 #if defined(_GLIBCXX_SHARED)
  87 namespace std _GLIBCXX_VISIBILITY(default)
  88 {
  89 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  90   // Replaced by _State_baseV2 in gcc-4.9.0
  91   class __future_base::_State_base
  92   {
  93     typedef _Ptr<_Result_base> _Ptr_type;
  94
  95     _Ptr_type                   _M_result;
  96     mutex                       _M_mutex;
  97     condition_variable          _M_cond;
  98     atomic_flag                 _M_retrieved;
  99     once_flag                   _M_once;
 100   public:
 101     virtual ~_State_base();
 102     virtual void _M_run_deferred() { }
 103   };
 104   __future_base::_State_base::~_State_base() { }
 105
 106   // Replaced by _Async_state_commonV2 in gcc-4.9.0
 107   class __future_base::_Async_state_common : public __future_base::_State_base
 108   {
 109   protected:
 110     ~_Async_state_common();
 111     virtual void _M_run_deferred() { _M_join(); }
 112     void _M_join() { std::call_once(_M_once, &thread::join, ref(_M_thread)); }
 113     thread _M_thread;
 114     once_flag _M_once;
 115   };
 116 #if defined(_GLIBCXX_HAVE_TLS)
 117   // Replaced with inline definition in gcc-4.8.0
 118   __future_base::_Async_state_common::~_Async_state_common() { _M_join(); }
 119
 120   template<typename _Tp>
 121     struct _Maybe_wrap_member_pointer;
 122
 123   template<typename _Tp, typename _Class>
 124     struct _Maybe_wrap_member_pointer<_Tp _Class::*>
 125     {
 126       typedef _Mem_fn<_Tp _Class::*> type;
 127
 128       static constexpr type
 129       __do_wrap(_Tp _Class::* __pm)
 130       { return type(__pm); }
 131     };
 132
 133   template<typename _Signature>
 134     struct _Bind_simple;
 135
 136   template<typename _Callable, typename... _Args>
 137     struct _Bind_simple<_Callable(_Args...)>
 138     {
 139       typedef typename result_of<_Callable(_Args...)>::type result_type;
 140
 141       template<typename _Tp, typename... _Up>
 142         explicit
 143         _Bind_simple(_Tp&& __f, _Up&&... __args)
 144         : _M_bound(std::forward<_Tp>(__f), std::forward<_Up>(__args)...)
 145         { }
 146
 147       _Bind_simple(const _Bind_simple&) = default;
 148       _Bind_simple(_Bind_simple&&) = default;
 149
 150       result_type
 151       operator()()
 152       {
 153         typedef typename _Build_index_tuple<sizeof...(_Args)>::__type _Indices;
 154         return _M_invoke(_Indices());
 155       }
 156
 157     private:
 158       template<std::size_t... _Indices>
 159         typename result_of<_Callable(_Args...)>::type
 160         _M_invoke(_Index_tuple<_Indices...>)
 161         {
 162          // std::bind always forwards bound arguments as lvalues,
 163          // but this type can call functions which only accept rvalues.
 164           return std::forward<_Callable>(std::get<0>(_M_bound))(
 165               std::forward<_Args>(std::get<_Indices+1>(_M_bound))...);
 166         }
 167
 168       std::tuple<_Callable, _Args...> _M_bound;
 169     };
 170
 171   template<typename _Func, typename... _BoundArgs>
 172     struct _Bind_simple_helper
 173     {
 174       typedef _Maybe_wrap_member_pointer<typename decay<_Func>::type>
 175         __maybe_type;
 176       typedef typename __maybe_type::type __func_type;
 177       typedef _Bind_simple<__func_type(typename decay<_BoundArgs>::type...)>
 178                __type;
 179     };
 180
 181   // Simplified version of std::bind for internal use, without support for
 182   // unbound arguments, placeholders or nested bind expressions.
 183   template<typename _Callable, typename... _Args>
 184     typename _Bind_simple_helper<_Callable, _Args...>::__type
 185     __bind_simple(_Callable&& __callable, _Args&&... __args)
 186     {
 187       typedef _Bind_simple_helper<_Callable, _Args...> __helper_type;
 188       typedef typename __helper_type::__maybe_type __maybe_type;
 189       typedef typename __helper_type::__type __result_type;
 190       return __result_type(
 191           __maybe_type::__do_wrap( std::forward<_Callable>(__callable)),
 192           std::forward<_Args>(__args)...);
 193     }
 194
 195   // Explicit instantiation due to -fno-implicit-instantiation.
 196   template void call_once(once_flag&, void (thread::*&&)(), reference_wrapper<thread>&&);
 197   template _Bind_simple_helper<void (thread::*)(), reference_wrapper<thread>>::__type __bind_simple(void (thread::*&&)(), reference_wrapper<thread>&&);
 198 #endif // _GLIBCXX_HAVE_TLS
 199 _GLIBCXX_END_NAMESPACE_VERSION
 200 } // namespace std
 201 #endif // _GLIBCXX_SHARED
 202 #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1