Update gcc-50 to SVN version 221572
[dragonfly.git] / contrib / gcc-5.0 / libstdc++-v3 / src / c++11 / future.cc
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1// future -*- C++ -*-
2
3// Copyright (C) 2009-2015 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 <future>
26
27namespace
28{
29 struct future_error_category : public std::error_category
30 {
31 virtual const char*
32 name() const noexcept
33 { return "future"; }
34
38c0c85b 35 _GLIBCXX_DEFAULT_ABI_TAG
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36 virtual std::string message(int __ec) const
37 {
38 std::string __msg;
39 switch (std::future_errc(__ec))
40 {
41 case std::future_errc::broken_promise:
42 __msg = "Broken promise";
43 break;
44 case std::future_errc::future_already_retrieved:
45 __msg = "Future already retrieved";
46 break;
47 case std::future_errc::promise_already_satisfied:
48 __msg = "Promise already satisfied";
49 break;
50 case std::future_errc::no_state:
51 __msg = "No associated state";
52 break;
53 default:
54 __msg = "Unknown error";
55 break;
56 }
57 return __msg;
58 }
59 };
60
61 const future_error_category&
62 __future_category_instance() noexcept
63 {
64 static const future_error_category __fec{};
65 return __fec;
66 }
67}
68
69namespace std _GLIBCXX_VISIBILITY(default)
70{
71_GLIBCXX_BEGIN_NAMESPACE_VERSION
72
73 const error_category& future_category() noexcept
74 { return __future_category_instance(); }
75
76 future_error::~future_error() noexcept { }
77
78 const char*
7de7a9db 79 future_error::what() const noexcept { return logic_error::what(); }
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80
81#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) \
82 && (ATOMIC_INT_LOCK_FREE > 1)
83 __future_base::_Result_base::_Result_base() = default;
84
85 __future_base::_Result_base::~_Result_base() = default;
86
87 void
88 __future_base::_State_baseV2::_Make_ready::_S_run(void* p)
89 {
90 unique_ptr<_Make_ready> mr{static_cast<_Make_ready*>(p)};
91 if (auto state = mr->_M_shared_state.lock())
92 {
93 // Use release MO to synchronize with observers of the ready state.
94 state->_M_status._M_store_notify_all(_Status::__ready,
95 memory_order_release);
96 }
97 }
98
99 // defined in src/c++11/condition_variable.cc
100 extern void
101 __at_thread_exit(__at_thread_exit_elt* elt);
102
103 void
104 __future_base::_State_baseV2::_Make_ready::_M_set()
105 {
106 _M_cb = &_Make_ready::_S_run;
107 __at_thread_exit(this);
108 }
109#endif
110
111_GLIBCXX_END_NAMESPACE_VERSION
112} // namespace std