libstdc++
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00001 // <thread> -*- C++ -*- 00002 00003 // Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 3, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /** @file include/thread 00026 * This is a Standard C++ Library header. 00027 */ 00028 00029 #ifndef _GLIBCXX_THREAD 00030 #define _GLIBCXX_THREAD 1 00031 00032 #pragma GCC system_header 00033 00034 #ifndef __GXX_EXPERIMENTAL_CXX0X__ 00035 # include <bits/c++0x_warning.h> 00036 #else 00037 00038 #include <chrono> 00039 #include <functional> 00040 #include <memory> 00041 #include <mutex> 00042 #include <condition_variable> 00043 #include <bits/functexcept.h> 00044 #include <bits/functional_hash.h> 00045 #include <bits/gthr.h> 00046 00047 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) 00048 00049 namespace std _GLIBCXX_VISIBILITY(default) 00050 { 00051 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00052 00053 /** 00054 * @defgroup threads Threads 00055 * @ingroup concurrency 00056 * 00057 * Classes for thread support. 00058 * @{ 00059 */ 00060 00061 /// thread 00062 class thread 00063 { 00064 public: 00065 typedef __gthread_t native_handle_type; 00066 struct _Impl_base; 00067 typedef shared_ptr<_Impl_base> __shared_base_type; 00068 00069 /// thread::id 00070 class id 00071 { 00072 native_handle_type _M_thread; 00073 00074 public: 00075 id() : _M_thread() { } 00076 00077 explicit 00078 id(native_handle_type __id) : _M_thread(__id) { } 00079 00080 private: 00081 friend class thread; 00082 friend class hash<thread::id>; 00083 00084 friend bool 00085 operator==(thread::id __x, thread::id __y) 00086 { return __gthread_equal(__x._M_thread, __y._M_thread); } 00087 00088 friend bool 00089 operator<(thread::id __x, thread::id __y) 00090 { return __x._M_thread < __y._M_thread; } 00091 00092 template<class _CharT, class _Traits> 00093 friend basic_ostream<_CharT, _Traits>& 00094 operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id); 00095 }; 00096 00097 // Simple base type that the templatized, derived class containing 00098 // an arbitrary functor can be converted to and called. 00099 struct _Impl_base 00100 { 00101 __shared_base_type _M_this_ptr; 00102 00103 inline virtual ~_Impl_base(); 00104 00105 virtual void _M_run() = 0; 00106 }; 00107 00108 template<typename _Callable> 00109 struct _Impl : public _Impl_base 00110 { 00111 _Callable _M_func; 00112 00113 _Impl(_Callable&& __f) : _M_func(std::forward<_Callable>(__f)) 00114 { } 00115 00116 void 00117 _M_run() { _M_func(); } 00118 }; 00119 00120 private: 00121 id _M_id; 00122 00123 public: 00124 thread() = default; 00125 thread(thread&) = delete; 00126 thread(const thread&) = delete; 00127 00128 thread(thread&& __t) 00129 { swap(__t); } 00130 00131 template<typename _Callable, typename... _Args> 00132 explicit 00133 thread(_Callable&& __f, _Args&&... __args) 00134 { 00135 _M_start_thread(_M_make_routine(std::bind<void>( 00136 std::forward<_Callable>(__f), 00137 std::forward<_Args>(__args)...))); 00138 } 00139 00140 ~thread() 00141 { 00142 if (joinable()) 00143 std::terminate(); 00144 } 00145 00146 thread& operator=(const thread&) = delete; 00147 00148 thread& operator=(thread&& __t) 00149 { 00150 if (joinable()) 00151 std::terminate(); 00152 swap(__t); 00153 return *this; 00154 } 00155 00156 void 00157 swap(thread& __t) 00158 { std::swap(_M_id, __t._M_id); } 00159 00160 bool 00161 joinable() const 00162 { return !(_M_id == id()); } 00163 00164 void 00165 join(); 00166 00167 void 00168 detach(); 00169 00170 thread::id 00171 get_id() const 00172 { return _M_id; } 00173 00174 /** @pre thread is joinable 00175 */ 00176 native_handle_type 00177 native_handle() 00178 { return _M_id._M_thread; } 00179 00180 // Returns a value that hints at the number of hardware thread contexts. 00181 static unsigned int 00182 hardware_concurrency() 00183 { return 0; } 00184 00185 private: 00186 void 00187 _M_start_thread(__shared_base_type); 00188 00189 template<typename _Callable> 00190 shared_ptr<_Impl<_Callable>> 00191 _M_make_routine(_Callable&& __f) 00192 { 00193 // Create and allocate full data structure, not base. 00194 return make_shared<_Impl<_Callable>>(std::forward<_Callable>(__f)); 00195 } 00196 }; 00197 00198 inline thread::_Impl_base::~_Impl_base() = default; 00199 00200 inline void 00201 swap(thread& __x, thread& __y) 00202 { __x.swap(__y); } 00203 00204 inline bool 00205 operator!=(thread::id __x, thread::id __y) 00206 { return !(__x == __y); } 00207 00208 inline bool 00209 operator<=(thread::id __x, thread::id __y) 00210 { return !(__y < __x); } 00211 00212 inline bool 00213 operator>(thread::id __x, thread::id __y) 00214 { return __y < __x; } 00215 00216 inline bool 00217 operator>=(thread::id __x, thread::id __y) 00218 { return !(__x < __y); } 00219 00220 // DR 889. 00221 /// std::hash specialization for thread::id. 00222 template<> 00223 struct hash<thread::id> 00224 : public __hash_base<size_t, thread::id> 00225 { 00226 size_t 00227 operator()(const thread::id& __id) const 00228 { return std::_Hash_impl::hash(__id._M_thread); } 00229 }; 00230 00231 template<class _CharT, class _Traits> 00232 inline basic_ostream<_CharT, _Traits>& 00233 operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id) 00234 { 00235 if (__id == thread::id()) 00236 return __out << "thread::id of a non-executing thread"; 00237 else 00238 return __out << __id._M_thread; 00239 } 00240 00241 _GLIBCXX_END_NAMESPACE_VERSION 00242 00243 /** @namespace std::this_thread 00244 * @brief ISO C++ 0x entities sub namespace for thread. 00245 * 30.2.2 Namespace this_thread. 00246 */ 00247 namespace this_thread 00248 { 00249 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00250 00251 /// get_id 00252 inline thread::id 00253 get_id() { return thread::id(__gthread_self()); } 00254 00255 #ifdef _GLIBCXX_USE_SCHED_YIELD 00256 /// yield 00257 inline void 00258 yield() 00259 { __gthread_yield(); } 00260 #endif 00261 00262 #ifdef _GLIBCXX_USE_NANOSLEEP 00263 /// sleep_until 00264 template<typename _Clock, typename _Duration> 00265 inline void 00266 sleep_until(const chrono::time_point<_Clock, _Duration>& __atime) 00267 { sleep_for(__atime - _Clock::now()); } 00268 00269 /// sleep_for 00270 template<typename _Rep, typename _Period> 00271 inline void 00272 sleep_for(const chrono::duration<_Rep, _Period>& __rtime) 00273 { 00274 chrono::seconds __s = 00275 chrono::duration_cast<chrono::seconds>(__rtime); 00276 00277 chrono::nanoseconds __ns = 00278 chrono::duration_cast<chrono::nanoseconds>(__rtime - __s); 00279 00280 __gthread_time_t __ts = 00281 { 00282 static_cast<std::time_t>(__s.count()), 00283 static_cast<long>(__ns.count()) 00284 }; 00285 00286 ::nanosleep(&__ts, 0); 00287 } 00288 #endif 00289 00290 _GLIBCXX_END_NAMESPACE_VERSION 00291 } 00292 00293 // @} group threads 00294 00295 } // namespace 00296 00297 #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1 00298 00299 #endif // __GXX_EXPERIMENTAL_CXX0X__ 00300 00301 #endif // _GLIBCXX_THREAD