1 // <thread> -*- C++ -*- 2 3 // Copyright (C) 2008, 2009, 2010, 2011, 2012 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 <bits/functexcept.h> 42 #include <bits/functional_hash.h> 43 #include <bits/gthr.h> 44 45 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) 46 47 namespace std _GLIBCXX_VISIBILITY(default) 48 { 49 _GLIBCXX_BEGIN_NAMESPACE_VERSION 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() noexcept : _M_thread() { } 74 75 explicit 76 id(native_handle_type __id) : _M_thread(__id) { } 77 78 private: 79 friend class thread; 80 friend class hash<thread::id>; 81 82 friend bool 83 operator==(thread::id __x, thread::id __y) noexcept 84 { return __gthread_equal(__x._M_thread, __y._M_thread); } 85 86 friend bool 87 operator<(thread::id __x, thread::id __y) noexcept 88 { return __x._M_thread < __y._M_thread; } 89 90 template<class _CharT, class _Traits> 91 friend basic_ostream<_CharT, _Traits>& 92 operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id); 93 }; 94 95 // Simple base type that the templatized, derived class containing 96 // an arbitrary functor can be converted to and called. 97 struct _Impl_base 98 { 99 __shared_base_type _M_this_ptr; 100 101 inline virtual ~_Impl_base(); 102 103 virtual void _M_run() = 0; 104 }; 105 106 template<typename _Callable> 107 struct _Impl : public _Impl_base 108 { 109 _Callable _M_func; 110 111 _Impl(_Callable&& __f) : _M_func(std::forward<_Callable>(__f)) 112 { } 113 114 void 115 _M_run() { _M_func(); } 116 }; 117 118 private: 119 id _M_id; 120 121 public: 122 thread() noexcept = default; 123 thread(thread&) = delete; 124 thread(const thread&) = delete; 125 126 thread(thread&& __t) noexcept 127 { swap(__t); } 128 129 template<typename _Callable, typename... _Args> 130 explicit 131 thread(_Callable&& __f, _Args&&... __args) 132 { 133 _M_start_thread(_M_make_routine(std::__bind_simple( 134 std::forward<_Callable>(__f), 135 std::forward<_Args>(__args)...))); 136 } 137 138 ~thread() 139 { 140 if (joinable()) 141 std::terminate(); 142 } 143 144 thread& operator=(const thread&) = delete; 145 146 thread& operator=(thread&& __t) noexcept 147 { 148 if (joinable()) 149 std::terminate(); 150 swap(__t); 151 return *this; 152 } 153 154 void 155 swap(thread& __t) noexcept 156 { std::swap(_M_id, __t._M_id); } 157 158 bool 159 joinable() const noexcept 160 { return !(_M_id == id()); } 161 162 void 163 join(); 164 165 void 166 detach(); 167 168 thread::id 169 get_id() const noexcept 170 { return _M_id; } 171 172 /** @pre thread is joinable 173 */ 174 native_handle_type 175 native_handle() 176 { return _M_id._M_thread; } 177 178 // Returns a value that hints at the number of hardware thread contexts. 179 static unsigned int 180 hardware_concurrency() noexcept; 181 182 private: 183 void 184 _M_start_thread(__shared_base_type); 185 186 template<typename _Callable> 187 shared_ptr<_Impl<_Callable>> 188 _M_make_routine(_Callable&& __f) 189 { 190 // Create and allocate full data structure, not base. 191 return std::make_shared<_Impl<_Callable>>(std::forward<_Callable>(__f)); 192 } 193 }; 194 195 inline thread::_Impl_base::~_Impl_base() = default; 196 197 inline void 198 swap(thread& __x, thread& __y) noexcept 199 { __x.swap(__y); } 200 201 inline bool 202 operator!=(thread::id __x, thread::id __y) noexcept 203 { return !(__x == __y); } 204 205 inline bool 206 operator<=(thread::id __x, thread::id __y) noexcept 207 { return !(__y < __x); } 208 209 inline bool 210 operator>(thread::id __x, thread::id __y) noexcept 211 { return __y < __x; } 212 213 inline bool 214 operator>=(thread::id __x, thread::id __y) noexcept 215 { return !(__x < __y); } 216 217 // DR 889. 218 /// std::hash specialization for thread::id. 219 template<> 220 struct hash<thread::id> 221 : public __hash_base<size_t, thread::id> 222 { 223 size_t 224 operator()(const thread::id& __id) const noexcept 225 { return std::_Hash_impl::hash(__id._M_thread); } 226 }; 227 228 template<class _CharT, class _Traits> 229 inline basic_ostream<_CharT, _Traits>& 230 operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id) 231 { 232 if (__id == thread::id()) 233 return __out << "thread::id of a non-executing thread"; 234 else 235 return __out << __id._M_thread; 236 } 237 238 _GLIBCXX_END_NAMESPACE_VERSION 239 240 /** @namespace std::this_thread 241 * @brief ISO C++ 0x entities sub namespace for thread. 242 * 30.2.2 Namespace this_thread. 243 */ 244 namespace this_thread 245 { 246 _GLIBCXX_BEGIN_NAMESPACE_VERSION 247 248 /// get_id 249 inline thread::id 250 get_id() noexcept { return thread::id(__gthread_self()); } 251 252 #ifdef _GLIBCXX_USE_SCHED_YIELD 253 /// yield 254 inline void 255 yield() noexcept 256 { __gthread_yield(); } 257 #endif 258 259 #ifdef _GLIBCXX_USE_NANOSLEEP 260 /// sleep_for 261 template<typename _Rep, typename _Period> 262 inline void 263 sleep_for(const chrono::duration<_Rep, _Period>& __rtime) 264 { 265 chrono::seconds __s = 266 chrono::duration_cast<chrono::seconds>(__rtime); 267 268 chrono::nanoseconds __ns = 269 chrono::duration_cast<chrono::nanoseconds>(__rtime - __s); 270 271 __gthread_time_t __ts = 272 { 273 static_cast<std::time_t>(__s.count()), 274 static_cast<long>(__ns.count()) 275 }; 276 277 ::nanosleep(&__ts, 0); 278 } 279 280 /// sleep_until 281 template<typename _Clock, typename _Duration> 282 inline void 283 sleep_until(const chrono::time_point<_Clock, _Duration>& __atime) 284 { sleep_for(__atime - _Clock::now()); } 285 #endif 286 287 _GLIBCXX_END_NAMESPACE_VERSION 288 } 289 290 // @} group threads 291 292 } // namespace 293 294 #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1 295 296 #endif // __GXX_EXPERIMENTAL_CXX0X__ 297 298 #endif // _GLIBCXX_THREAD 299
