1 // <thread> -*- C++ -*- 2 3 // Copyright (C) 2008, 2009, 2010, 2011 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 /** @file include/thread 26 * This is a Standard C++ Library header. 27 */ 28 29 #ifndef _GLIBCXX_THREAD 30 #define _GLIBCXX_THREAD 1 31 32 #pragma GCC system_header 33 34 #ifndef __GXX_EXPERIMENTAL_CXX0X__ 35 # include <bits/c++0x_warning.h> 36 #else 37 38 #include <chrono> 39 #include <functional> 40 #include <memory> 41 #include <mutex> 42 #include <condition_variable> 43 #include <bits/functexcept.h> 44 #include <bits/functional_hash.h> 45 #include <bits/gthr.h> 46 47 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) 48 49 namespace std _GLIBCXX_VISIBILITY(default) 50 { 51 _GLIBCXX_BEGIN_NAMESPACE_VERSION 52 53 /** 54 * @defgroup threads Threads 55 * @ingroup concurrency 56 * 57 * Classes for thread support. 58 * @{ 59 */ 60 61 /// thread 62 class thread 63 { 64 public: 65 typedef __gthread_t native_handle_type; 66 struct _Impl_base; 67 typedef shared_ptr<_Impl_base> __shared_base_type; 68 69 /// thread::id 70 class id 71 { 72 native_handle_type _M_thread; 73 74 public: 75 id() : _M_thread() { } 76 77 explicit 78 id(native_handle_type __id) : _M_thread(__id) { } 79 80 private: 81 friend class thread; 82 friend class hash<thread::id>; 83 84 friend bool 85 operator==(thread::id __x, thread::id __y) 86 { return __gthread_equal(__x._M_thread, __y._M_thread); } 87 88 friend bool 89 operator<(thread::id __x, thread::id __y) 90 { return __x._M_thread < __y._M_thread; } 91 92 template<class _CharT, class _Traits> 93 friend basic_ostream<_CharT, _Traits>& 94 operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id); 95 }; 96 97 // Simple base type that the templatized, derived class containing 98 // an arbitrary functor can be converted to and called. 99 struct _Impl_base 100 { 101 __shared_base_type _M_this_ptr; 102 103 inline virtual ~_Impl_base(); 104 105 virtual void _M_run() = 0; 106 }; 107 108 template<typename _Callable> 109 struct _Impl : public _Impl_base 110 { 111 _Callable _M_func; 112 113 _Impl(_Callable&& __f) : _M_func(std::forward<_Callable>(__f)) 114 { } 115 116 void 117 _M_run() { _M_func(); } 118 }; 119 120 private: 121 id _M_id; 122 123 public: 124 thread() = default; 125 thread(thread&) = delete; 126 thread(const thread&) = delete; 127 128 thread(thread&& __t) 129 { swap(__t); } 130 131 template<typename _Callable, typename... _Args> 132 explicit 133 thread(_Callable&& __f, _Args&&... __args) 134 { 135 _M_start_thread(_M_make_routine(std::bind<void>( 136 std::forward<_Callable>(__f), 137 std::forward<_Args>(__args)...))); 138 } 139 140 ~thread() 141 { 142 if (joinable()) 143 std::terminate(); 144 } 145 146 thread& operator=(const thread&) = delete; 147 148 thread& operator=(thread&& __t) 149 { 150 if (joinable()) 151 std::terminate(); 152 swap(__t); 153 return *this; 154 } 155 156 void 157 swap(thread& __t) 158 { std::swap(_M_id, __t._M_id); } 159 160 bool 161 joinable() const 162 { return !(_M_id == id()); } 163 164 void 165 join(); 166 167 void 168 detach(); 169 170 thread::id 171 get_id() const 172 { return _M_id; } 173 174 /** @pre thread is joinable 175 */ 176 native_handle_type 177 native_handle() 178 { return _M_id._M_thread; } 179 180 // Returns a value that hints at the number of hardware thread contexts. 181 static unsigned int 182 hardware_concurrency() 183 { return 0; } 184 185 private: 186 void 187 _M_start_thread(__shared_base_type); 188 189 template<typename _Callable> 190 shared_ptr<_Impl<_Callable>> 191 _M_make_routine(_Callable&& __f) 192 { 193 // Create and allocate full data structure, not base. 194 return make_shared<_Impl<_Callable>>(std::forward<_Callable>(__f)); 195 } 196 }; 197 198 inline thread::_Impl_base::~_Impl_base() = default; 199 200 inline void 201 swap(thread& __x, thread& __y) 202 { __x.swap(__y); } 203 204 inline bool 205 operator!=(thread::id __x, thread::id __y) 206 { return !(__x == __y); } 207 208 inline bool 209 operator<=(thread::id __x, thread::id __y) 210 { return !(__y < __x); } 211 212 inline bool 213 operator>(thread::id __x, thread::id __y) 214 { return __y < __x; } 215 216 inline bool 217 operator>=(thread::id __x, thread::id __y) 218 { return !(__x < __y); } 219 220 // DR 889. 221 /// std::hash specialization for thread::id. 222 template<> 223 struct hash<thread::id> 224 : public __hash_base<size_t, thread::id> 225 { 226 size_t 227 operator()(const thread::id& __id) const noexcept 228 { return std::_Hash_impl::hash(__id._M_thread); } 229 }; 230 231 template<class _CharT, class _Traits> 232 inline basic_ostream<_CharT, _Traits>& 233 operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id) 234 { 235 if (__id == thread::id()) 236 return __out << "thread::id of a non-executing thread"; 237 else 238 return __out << __id._M_thread; 239 } 240 241 _GLIBCXX_END_NAMESPACE_VERSION 242 243 /** @namespace std::this_thread 244 * @brief ISO C++ 0x entities sub namespace for thread. 245 * 30.2.2 Namespace this_thread. 246 */ 247 namespace this_thread 248 { 249 _GLIBCXX_BEGIN_NAMESPACE_VERSION 250 251 /// get_id 252 inline thread::id 253 get_id() { return thread::id(__gthread_self()); } 254 255 #ifdef _GLIBCXX_USE_SCHED_YIELD 256 /// yield 257 inline void 258 yield() 259 { __gthread_yield(); } 260 #endif 261 262 #ifdef _GLIBCXX_USE_NANOSLEEP 263 /// sleep_until 264 template<typename _Clock, typename _Duration> 265 inline void 266 sleep_until(const chrono::time_point<_Clock, _Duration>& __atime) 267 { sleep_for(__atime - _Clock::now()); } 268 269 /// sleep_for 270 template<typename _Rep, typename _Period> 271 inline void 272 sleep_for(const chrono::duration<_Rep, _Period>& __rtime) 273 { 274 chrono::seconds __s = 275 chrono::duration_cast<chrono::seconds>(__rtime); 276 277 chrono::nanoseconds __ns = 278 chrono::duration_cast<chrono::nanoseconds>(__rtime - __s); 279 280 __gthread_time_t __ts = 281 { 282 static_cast<std::time_t>(__s.count()), 283 static_cast<long>(__ns.count()) 284 }; 285 286 ::nanosleep(&__ts, 0); 287 } 288 #endif 289 290 _GLIBCXX_END_NAMESPACE_VERSION 291 } 292 293 // @} group threads 294 295 } // namespace 296 297 #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1 298 299 #endif // __GXX_EXPERIMENTAL_CXX0X__ 300 301 #endif // _GLIBCXX_THREAD 302
