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