1// future -*- 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 <future>
26#include <bits/functexcept.h>
27
28namespace
29{
30 struct future_error_category : public std::error_category
31 {
32 virtual const char*
33 name() const noexcept
34 { return "future"; }
35
36 _GLIBCXX_DEFAULT_ABI_TAG
37 virtual std::string message(int __ec) const
38 {
39 std::string __msg;
40 switch (std::future_errc(__ec))
41 {
42 case std::future_errc::broken_promise:
43 __msg = "Broken promise";
44 break;
45 case std::future_errc::future_already_retrieved:
46 __msg = "Future already retrieved";
47 break;
48 case std::future_errc::promise_already_satisfied:
49 __msg = "Promise already satisfied";
50 break;
51 case std::future_errc::no_state:
52 __msg = "No associated state";
53 break;
54 default:
55 __msg = "Unknown error";
56 break;
57 }
58 return __msg;
59 }
60 };
61
62 const future_error_category&
63 __future_category_instance() noexcept
64 {
65 static const future_error_category __fec{};
66 return __fec;
67 }
68}
69
70namespace std _GLIBCXX_VISIBILITY(default)
71{
72_GLIBCXX_BEGIN_NAMESPACE_VERSION
73
74 void
75 __throw_future_error(int __i __attribute__((unused)))
76 { _GLIBCXX_THROW_OR_ABORT(future_error(make_error_code(future_errc(__i)))); }
77
78 const error_category& future_category() noexcept
79 { return __future_category_instance(); }
80
81 future_error::~future_error() noexcept { }
82
83 const char*
84 future_error::what() const noexcept { return logic_error::what(); }
85
86#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
87 __future_base::_Result_base::_Result_base() = default;
88
89 __future_base::_Result_base::~_Result_base() = default;
90
91 void
92 __future_base::_State_baseV2::_Make_ready::_S_run(void* p)
93 {
94 unique_ptr<_Make_ready> mr{static_cast<_Make_ready*>(p)};
95 if (auto state = mr->_M_shared_state.lock())
96 {
97 // Use release MO to synchronize with observers of the ready state.
98 state->_M_status._M_store_notify_all(_Status::__ready,
99 memory_order_release);
100 }
101 }
102
103 // defined in src/c++11/condition_variable.cc
104 extern void
105 __at_thread_exit(__at_thread_exit_elt* elt);
106
107 void
108 __future_base::_State_baseV2::_Make_ready::_M_set()
109 {
110 _M_cb = &_Make_ready::_S_run;
111 __at_thread_exit(this);
112 }
113#endif
114
115_GLIBCXX_END_NAMESPACE_VERSION
116} // namespace std
117