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998dadf4 | 1 | // condition_variable -*- C++ -*- |
057bae2c | 2 | |
fbd26352 | 3 | // Copyright (C) 2008-2019 Free Software Foundation, Inc. |
057bae2c | 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 | |
6bc9506f | 8 | // Free Software Foundation; either version 3, or (at your option) |
057bae2c | 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 | ||
6bc9506f | 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/>. | |
057bae2c | 24 | |
25 | #include <condition_variable> | |
0b444d7c | 26 | #include <cstdlib> |
057bae2c | 27 | |
d3901223 | 28 | #ifdef _GLIBCXX_HAS_GTHREADS |
5cee5730 | 29 | |
2948dd21 | 30 | namespace std _GLIBCXX_VISIBILITY(default) |
31 | { | |
32 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
5022cf3f | 33 | |
5cee5730 | 34 | #ifdef __GTHREAD_COND_INIT |
bc904b8f | 35 | condition_variable::condition_variable() noexcept = default; |
5cee5730 | 36 | #else |
e472b6e5 | 37 | condition_variable::condition_variable() noexcept |
38 | { | |
f47763a6 | 39 | __GTHREAD_COND_INIT_FUNCTION(&_M_cond); |
057bae2c | 40 | } |
88f1a24d | 41 | #endif |
057bae2c | 42 | |
e472b6e5 | 43 | condition_variable::~condition_variable() noexcept |
057bae2c | 44 | { |
057bae2c | 45 | // XXX no thread blocked |
5cee5730 | 46 | /* int __e = */ __gthread_cond_destroy(&_M_cond); |
057bae2c | 47 | // if __e == EBUSY then blocked |
057bae2c | 48 | } |
49 | ||
5cee5730 | 50 | void |
ba2936df | 51 | condition_variable::wait(unique_lock<mutex>& __lock) noexcept |
5cee5730 | 52 | { |
53 | int __e = __gthread_cond_wait(&_M_cond, __lock.mutex()->native_handle()); | |
54 | ||
55 | if (__e) | |
ba2936df | 56 | std::terminate(); |
5cee5730 | 57 | } |
2db33624 | 58 | |
59 | void | |
e472b6e5 | 60 | condition_variable::notify_one() noexcept |
2db33624 | 61 | { |
5cee5730 | 62 | int __e = __gthread_cond_signal(&_M_cond); |
057bae2c | 63 | |
64 | // XXX not in spec | |
65 | // EINVAL | |
5cee5730 | 66 | if (__e) |
057bae2c | 67 | __throw_system_error(__e); |
057bae2c | 68 | } |
69 | ||
2db33624 | 70 | void |
e472b6e5 | 71 | condition_variable::notify_all() noexcept |
2db33624 | 72 | { |
5cee5730 | 73 | int __e = __gthread_cond_broadcast(&_M_cond); |
057bae2c | 74 | |
75 | // XXX not in spec | |
76 | // EINVAL | |
5cee5730 | 77 | if (__e) |
057bae2c | 78 | __throw_system_error(__e); |
057bae2c | 79 | } |
80 | ||
2761faca | 81 | extern void |
82 | __at_thread_exit(__at_thread_exit_elt*); | |
83 | ||
84 | namespace | |
85 | { | |
86 | __gthread_key_t key; | |
87 | ||
88 | void run(void* p) | |
89 | { | |
90 | auto elt = (__at_thread_exit_elt*)p; | |
91 | while (elt) | |
92 | { | |
93 | auto next = elt->_M_next; | |
94 | elt->_M_cb(elt); | |
95 | elt = next; | |
96 | } | |
97 | } | |
98 | ||
99 | void run() | |
100 | { | |
101 | auto elt = (__at_thread_exit_elt*)__gthread_getspecific(key); | |
102 | __gthread_setspecific(key, nullptr); | |
103 | run(elt); | |
104 | } | |
105 | ||
106 | struct notifier final : __at_thread_exit_elt | |
107 | { | |
108 | notifier(condition_variable& cv, unique_lock<mutex>& l) | |
109 | : cv(&cv), mx(l.release()) | |
110 | { | |
111 | _M_cb = ¬ifier::run; | |
112 | __at_thread_exit(this); | |
113 | } | |
114 | ||
115 | ~notifier() | |
116 | { | |
117 | mx->unlock(); | |
118 | cv->notify_all(); | |
119 | } | |
120 | ||
121 | condition_variable* cv; | |
122 | mutex* mx; | |
123 | ||
124 | static void run(void* p) { delete static_cast<notifier*>(p); } | |
125 | }; | |
126 | ||
127 | ||
128 | void key_init() { | |
129 | struct key_s { | |
130 | key_s() { __gthread_key_create (&key, run); } | |
131 | ~key_s() { __gthread_key_delete (key); } | |
132 | }; | |
133 | static key_s ks; | |
134 | // Also make sure the callbacks are run by std::exit. | |
135 | std::atexit (run); | |
136 | } | |
137 | } | |
138 | ||
139 | void | |
140 | __at_thread_exit(__at_thread_exit_elt* elt) | |
141 | { | |
142 | static __gthread_once_t once = __GTHREAD_ONCE_INIT; | |
143 | __gthread_once (&once, key_init); | |
144 | ||
145 | elt->_M_next = (__at_thread_exit_elt*)__gthread_getspecific(key); | |
146 | __gthread_setspecific(key, elt); | |
147 | } | |
148 | ||
149 | void | |
150 | notify_all_at_thread_exit(condition_variable& cv, unique_lock<mutex> l) | |
151 | { | |
152 | (void) new notifier{cv, l}; | |
153 | } | |
154 | ||
2948dd21 | 155 | _GLIBCXX_END_NAMESPACE_VERSION |
156 | } // namespace | |
057bae2c | 157 | |
d3901223 | 158 | #endif // _GLIBCXX_HAS_GTHREADS |