1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
// condition_variable -*- C++ -*-
// Copyright (C) 2008-2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
#include <condition_variable>
#include <cstdlib>
#ifdef _GLIBCXX_HAS_GTHREADS
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
#ifdef __GTHREAD_COND_INIT
condition_variable::condition_variable() noexcept = default;
#else
condition_variable::condition_variable() noexcept
{
__GTHREAD_COND_INIT_FUNCTION(&_M_cond);
}
#endif
condition_variable::~condition_variable() noexcept
{
// XXX no thread blocked
/* int __e = */ __gthread_cond_destroy(&_M_cond);
// if __e == EBUSY then blocked
}
void
condition_variable::wait(unique_lock<mutex>& __lock) noexcept
{
int __e = __gthread_cond_wait(&_M_cond, __lock.mutex()->native_handle());
if (__e)
std::terminate();
}
void
condition_variable::notify_one() noexcept
{
int __e = __gthread_cond_signal(&_M_cond);
// XXX not in spec
// EINVAL
if (__e)
__throw_system_error(__e);
}
void
condition_variable::notify_all() noexcept
{
int __e = __gthread_cond_broadcast(&_M_cond);
// XXX not in spec
// EINVAL
if (__e)
__throw_system_error(__e);
}
extern void
__at_thread_exit(__at_thread_exit_elt*);
namespace
{
__gthread_key_t key;
void run(void* p)
{
auto elt = (__at_thread_exit_elt*)p;
while (elt)
{
auto next = elt->_M_next;
elt->_M_cb(elt);
elt = next;
}
}
void run()
{
auto elt = (__at_thread_exit_elt*)__gthread_getspecific(key);
__gthread_setspecific(key, nullptr);
run(elt);
}
struct notifier final : __at_thread_exit_elt
{
notifier(condition_variable& cv, unique_lock<mutex>& l)
: cv(&cv), mx(l.release())
{
_M_cb = ¬ifier::run;
__at_thread_exit(this);
}
~notifier()
{
mx->unlock();
cv->notify_all();
}
condition_variable* cv;
mutex* mx;
static void run(void* p) { delete static_cast<notifier*>(p); }
};
void key_init() {
struct key_s {
key_s() { __gthread_key_create (&key, run); }
~key_s() { __gthread_key_delete (key); }
};
static key_s ks;
// Also make sure the callbacks are run by std::exit.
std::atexit (run);
}
}
void
__at_thread_exit(__at_thread_exit_elt* elt)
{
static __gthread_once_t once = __GTHREAD_ONCE_INIT;
__gthread_once (&once, key_init);
elt->_M_next = (__at_thread_exit_elt*)__gthread_getspecific(key);
__gthread_setspecific(key, elt);
}
void
notify_all_at_thread_exit(condition_variable& cv, unique_lock<mutex> l)
{
(void) new notifier{cv, l};
}
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif // _GLIBCXX_HAS_GTHREADS
|
