1 // thread -*- C++ -*-
2
3 // Copyright (C) 2008-2013 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
26 #include <thread>
27 #include <system_error>
28 #include <cerrno>
29 #include <cxxabi_forced.h>
30
31 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
32
33 #if defined(_GLIBCXX_USE_GET_NPROCS)
34 # include <sys/sysinfo.h>
35 # define _GLIBCXX_NPROCS get_nprocs()
36 #elif defined(_GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP)
37 # define _GLIBCXX_NPROCS pthread_num_processors_np()
38 #elif defined(_GLIBCXX_USE_SYSCTL_HW_NCPU)
39 # include <stddef.h>
40 # include <sys/sysctl.h>
get_nprocs()41 static inline int get_nprocs()
42 {
43 int count;
44 size_t size = sizeof(count);
45 int mib[] = { CTL_HW, HW_NCPU };
46 if (!sysctl(mib, 2, &count, &size, NULL, 0))
47 return count;
48 return 0;
49 }
50 # define _GLIBCXX_NPROCS get_nprocs()
51 #elif defined(_GLIBCXX_USE_SC_NPROCESSORS_ONLN)
52 # include <unistd.h>
53 # define _GLIBCXX_NPROCS sysconf(_SC_NPROCESSORS_ONLN)
54 #elif defined(_GLIBCXX_USE_SC_NPROC_ONLN)
55 # include <unistd.h>
56 # define _GLIBCXX_NPROCS sysconf(_SC_NPROC_ONLN)
57 #else
58 # define _GLIBCXX_NPROCS 0
59 #endif
60
61 #ifndef _GLIBCXX_USE_NANOSLEEP
62 # ifdef _GLIBCXX_HAVE_SLEEP
63 # include <unistd.h>
64 # elif defined(_GLIBCXX_HAVE_WIN32_SLEEP)
65 # include <windows.h>
66 # else
67 # error "No sleep function known for this target"
68 # endif
69 #endif
70
71 namespace std _GLIBCXX_VISIBILITY(default)
72 {
73 namespace
74 {
75 extern "C" void*
execute_native_thread_routine(void * __p)76 execute_native_thread_routine(void* __p)
77 {
78 thread::_Impl_base* __t = static_cast<thread::_Impl_base*>(__p);
79 thread::__shared_base_type __local;
80 __local.swap(__t->_M_this_ptr);
81
82 __try
83 {
84 __t->_M_run();
85 }
86 __catch(const __cxxabiv1::__forced_unwind&)
87 {
88 __throw_exception_again;
89 }
90 __catch(...)
91 {
92 std::terminate();
93 }
94
95 return 0;
96 }
97 }
98
99 _GLIBCXX_BEGIN_NAMESPACE_VERSION
100
101 void
join()102 thread::join()
103 {
104 int __e = EINVAL;
105
106 if (_M_id != id())
107 __e = __gthread_join(_M_id._M_thread, 0);
108
109 if (__e)
110 __throw_system_error(__e);
111
112 _M_id = id();
113 }
114
115 void
detach()116 thread::detach()
117 {
118 int __e = EINVAL;
119
120 if (_M_id != id())
121 __e = __gthread_detach(_M_id._M_thread);
122
123 if (__e)
124 __throw_system_error(__e);
125
126 _M_id = id();
127 }
128
129 void
_M_start_thread(__shared_base_type __b)130 thread::_M_start_thread(__shared_base_type __b)
131 {
132 if (!__gthread_active_p())
133 #if __EXCEPTIONS
134 throw system_error(make_error_code(errc::operation_not_permitted),
135 "Enable multithreading to use std::thread");
136 #else
137 __throw_system_error(int(errc::operation_not_permitted));
138 #endif
139
140 __b->_M_this_ptr = __b;
141 int __e = __gthread_create(&_M_id._M_thread,
142 &execute_native_thread_routine, __b.get());
143 if (__e)
144 {
145 __b->_M_this_ptr.reset();
146 __throw_system_error(__e);
147 }
148 }
149
150 unsigned int
hardware_concurrency()151 thread::hardware_concurrency() noexcept
152 {
153 int __n = _GLIBCXX_NPROCS;
154 if (__n < 0)
155 __n = 0;
156 return __n;
157 }
158
159 _GLIBCXX_END_NAMESPACE_VERSION
160
161 namespace this_thread
162 {
163 _GLIBCXX_BEGIN_NAMESPACE_VERSION
164
165 void
__sleep_for(chrono::seconds __s,chrono::nanoseconds __ns)166 __sleep_for(chrono::seconds __s, chrono::nanoseconds __ns)
167 {
168 #ifdef _GLIBCXX_USE_NANOSLEEP
169 __gthread_time_t __ts =
170 {
171 static_cast<std::time_t>(__s.count()),
172 static_cast<long>(__ns.count())
173 };
174 ::nanosleep(&__ts, 0);
175 #elif defined(_GLIBCXX_HAVE_SLEEP)
176 # ifdef _GLIBCXX_HAVE_USLEEP
177 ::sleep(__s.count());
178 if (__ns.count() > 0)
179 {
180 long __us = __ns.count() / 1000;
181 if (__us == 0)
182 __us = 1;
183 ::usleep(__us);
184 }
185 # else
186 ::sleep(__s.count() + (__ns.count() >= 1000000));
187 # endif
188 #elif defined(_GLIBCXX_HAVE_WIN32_SLEEP)
189 unsigned long ms = __ns.count() / 1000000;
190 if (__ns.count() > 0 && ms == 0)
191 ms = 1;
192 ::Sleep(chrono::milliseconds(__s).count() + ms);
193 #endif
194 }
195
196 _GLIBCXX_END_NAMESPACE_VERSION
197 }
198
199 } // namespace std
200
201 #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
202