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The C and C++ Include Header Files
/usr/include/c++/13/thread
$ cat -n /usr/include/c++/13/thread 1 // <thread> -*- C++ -*- 2 3 // Copyright (C) 2008-2023 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 #include <bits/requires_hosted.h> // concurrency 35 36 #if __cplusplus < 201103L 37 # include <bits/c++0x_warning.h> 38 #else 39 40 #if __cplusplus > 201703L 41 # include <compare> // std::strong_ordering 42 # include <stop_token> // std::stop_source, std::stop_token, std::nostopstate 43 #endif 44 45 #include <bits/std_thread.h> // std::thread, get_id, yield 46 #include <bits/this_thread_sleep.h> // std::this_thread::sleep_for, sleep_until 47 48 namespace std _GLIBCXX_VISIBILITY(default) 49 { 50 _GLIBCXX_BEGIN_NAMESPACE_VERSION 51 52 /** 53 * @defgroup threads Threads 54 * @ingroup concurrency 55 * @since C++11 56 * 57 * Classes for thread support. 58 * @{ 59 */ 60 61 // std::thread is defined in <bits/std_thread.h> 62 63 /// @relates std::thread::id @{ 64 65 #if __cpp_lib_three_way_comparison 66 inline strong_ordering 67 operator<=>(thread::id __x, thread::id __y) noexcept 68 { return __x._M_thread <=> __y._M_thread; } 69 #else 70 inline bool 71 operator!=(thread::id __x, thread::id __y) noexcept 72 { return !(__x == __y); } 73 74 inline bool 75 operator<(thread::id __x, thread::id __y) noexcept 76 { 77 // Pthreads doesn't define any way to do this, so we just have to 78 // assume native_handle_type is LessThanComparable. 79 return __x._M_thread < __y._M_thread; 80 } 81 82 inline bool 83 operator<=(thread::id __x, thread::id __y) noexcept 84 { return !(__y < __x); } 85 86 inline bool 87 operator>(thread::id __x, thread::id __y) noexcept 88 { return __y < __x; } 89 90 inline bool 91 operator>=(thread::id __x, thread::id __y) noexcept 92 { return !(__x < __y); } 93 #endif // __cpp_lib_three_way_comparison 94 95 template<class _CharT, class _Traits> 96 inline basic_ostream<_CharT, _Traits>& 97 operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id) 98 { 99 if (__id == thread::id()) 100 return __out << "thread::id of a non-executing thread"; 101 else 102 return __out << __id._M_thread; 103 } 104 /// @} 105 106 #ifdef __cpp_lib_jthread 107 108 /// @cond undocumented 109 #ifndef __STRICT_ANSI__ 110 template<typename _Callable, typename... _Args> 111 constexpr bool __pmf_expects_stop_token = false; 112 113 template<typename _Callable, typename _Obj, typename... _Args> 114 constexpr bool __pmf_expects_stop_token<_Callable, _Obj, _Args...> 115 = __and_<is_member_function_pointer<remove_reference_t<_Callable>>, 116 is_invocable<_Callable, _Obj, stop_token, _Args...>>::value; 117 #endif 118 /// @endcond 119 120 /** A thread with cancellation and automatic joining. 121 * 122 * Unlike `std::thread`, destroying a joinable `std::jthread` will not 123 * terminate the process. Instead, it will try to request its thread to 124 * stop, then will join it. 125 * 126 * A `std::jthread` has a `std::stop_source` member which will be passed 127 * as the first argument to the callable that runs in the new thread 128 * (as long as the callable will accept that argument). That can then 129 * be used to send a stop request that the new thread can test for. 130 * 131 * @headerfile thread 132 * @since C++20 133 */ 134 class jthread 135 { 136 public: 137 using id = thread::id; 138 using native_handle_type = thread::native_handle_type; 139 140 jthread() noexcept 141 : _M_stop_source{nostopstate} 142 { } 143 144 template<typename _Callable, typename... _Args, 145 typename = enable_if_t<!is_same_v<remove_cvref_t<_Callable>, 146 jthread>>> 147 explicit 148 jthread(_Callable&& __f, _Args&&... __args) 149 : _M_thread{_S_create(_M_stop_source, std::forward<_Callable>(__f), 150 std::forward<_Args>(__args)...)} 151 { } 152 153 jthread(const jthread&) = delete; 154 jthread(jthread&&) noexcept = default; 155 156 ~jthread() 157 { 158 if (joinable()) 159 { 160 request_stop(); 161 join(); 162 } 163 } 164 165 jthread& 166 operator=(const jthread&) = delete; 167 168 jthread& 169 operator=(jthread&& __other) noexcept 170 { 171 std::jthread(std::move(__other)).swap(*this); 172 return *this; 173 } 174 175 void 176 swap(jthread& __other) noexcept 177 { 178 std::swap(_M_stop_source, __other._M_stop_source); 179 std::swap(_M_thread, __other._M_thread); 180 } 181 182 [[nodiscard]] bool 183 joinable() const noexcept 184 { 185 return _M_thread.joinable(); 186 } 187 188 void 189 join() 190 { 191 _M_thread.join(); 192 } 193 194 void 195 detach() 196 { 197 _M_thread.detach(); 198 } 199 200 [[nodiscard]] id 201 get_id() const noexcept 202 { 203 return _M_thread.get_id(); 204 } 205 206 [[nodiscard]] native_handle_type 207 native_handle() 208 { 209 return _M_thread.native_handle(); 210 } 211 212 [[nodiscard]] static unsigned 213 hardware_concurrency() noexcept 214 { 215 return thread::hardware_concurrency(); 216 } 217 218 [[nodiscard]] stop_source 219 get_stop_source() noexcept 220 { 221 return _M_stop_source; 222 } 223 224 [[nodiscard]] stop_token 225 get_stop_token() const noexcept 226 { 227 return _M_stop_source.get_token(); 228 } 229 230 bool request_stop() noexcept 231 { 232 return _M_stop_source.request_stop(); 233 } 234 235 friend void swap(jthread& __lhs, jthread& __rhs) noexcept 236 { 237 __lhs.swap(__rhs); 238 } 239 240 private: 241 template<typename _Callable, typename... _Args> 242 static thread 243 _S_create(stop_source& __ssrc, _Callable&& __f, _Args&&... __args) 244 { 245 #ifndef __STRICT_ANSI__ 246 if constexpr (__pmf_expects_stop_token<_Callable, _Args...>) 247 return _S_create_pmf(__ssrc, __f, std::forward<_Args>(__args)...); 248 else 249 #endif 250 if constexpr(is_invocable_v<decay_t<_Callable>, stop_token, 251 decay_t<_Args>...>) 252 return thread{std::forward<_Callable>(__f), __ssrc.get_token(), 253 std::forward<_Args>(__args)...}; 254 else 255 { 256 static_assert(is_invocable_v<decay_t<_Callable>, 257 decay_t<_Args>...>, 258 "std::jthread arguments must be invocable after" 259 " conversion to rvalues"); 260 return thread{std::forward<_Callable>(__f), 261 std::forward<_Args>(__args)...}; 262 } 263 } 264 265 #ifndef __STRICT_ANSI__ 266 template<typename _Callable, typename _Obj, typename... _Args> 267 static thread 268 _S_create_pmf(stop_source& __ssrc, _Callable __f, _Obj&& __obj, 269 _Args&&... __args) 270 { 271 return thread{__f, std::forward<_Obj>(__obj), __ssrc.get_token(), 272 std::forward<_Args>(__args)...}; 273 } 274 #endif 275 276 stop_source _M_stop_source; 277 thread _M_thread; 278 }; 279 #endif // __cpp_lib_jthread 280 281 /// @} group threads 282 283 _GLIBCXX_END_NAMESPACE_VERSION 284 } // namespace 285 #endif // C++11 286 #endif // _GLIBCXX_THREAD
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