1 // <condition_variable> -*- 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 condition_variable 26 * This is a Standard C++ Library header. 27 */ 28 29 #ifndef _GLIBCXX_CONDITION_VARIABLE 30 #define _GLIBCXX_CONDITION_VARIABLE 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 <mutex> // unique_lock 40 41 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) 42 43 namespace std 44 { 45 /** 46 * @defgroup condition_variables Condition Variables 47 * @ingroup concurrency 48 * 49 * Classes for condition_variable support. 50 * @{ 51 */ 52 53 /// condition_variable 54 class condition_variable 55 { 56 typedef chrono::system_clock __clock_t; 57 typedef __gthread_cond_t __native_type; 58 __native_type _M_cond; 59 60 public: 61 typedef __native_type* native_handle_type; 62 63 condition_variable(); 64 ~condition_variable(); 65 66 condition_variable(const condition_variable&) = delete; 67 condition_variable& operator=(const condition_variable&) = delete; 68 69 void 70 notify_one(); 71 72 void 73 notify_all(); 74 75 void 76 wait(unique_lock<mutex>& __lock); 77 78 template<typename _Predicate> 79 void 80 wait(unique_lock<mutex>& __lock, _Predicate __p) 81 { 82 while (!__p()) 83 wait(__lock); 84 } 85 86 template<typename _Duration> 87 bool 88 wait_until(unique_lock<mutex>& __lock, 89 const chrono::time_point<__clock_t, _Duration>& __atime) 90 { return __wait_until_impl(__lock, __atime); } 91 92 template<typename _Clock, typename _Duration> 93 bool 94 wait_until(unique_lock<mutex>& __lock, 95 const chrono::time_point<_Clock, _Duration>& __atime) 96 { 97 // DR 887 - Sync unknown clock to known clock. 98 typename _Clock::time_point __c_entry = _Clock::now(); 99 __clock_t::time_point __s_entry = __clock_t::now(); 100 chrono::nanoseconds __delta = __atime - __c_entry; 101 __clock_t::time_point __s_atime = __s_entry + __delta; 102 103 return __wait_until_impl(__lock, __s_atime); 104 } 105 106 template<typename _Clock, typename _Duration, typename _Predicate> 107 bool 108 wait_until(unique_lock<mutex>& __lock, 109 const chrono::time_point<_Clock, _Duration>& __atime, 110 _Predicate __p) 111 { 112 while (!__p()) 113 if (!wait_until(__lock, __atime)) 114 return __p(); 115 116 return true; 117 } 118 119 template<typename _Rep, typename _Period> 120 bool 121 wait_for(unique_lock<mutex>& __lock, 122 const chrono::duration<_Rep, _Period>& __rtime) 123 { return wait_until(__lock, __clock_t::now() + __rtime); } 124 125 template<typename _Rep, typename _Period, typename _Predicate> 126 bool 127 wait_for(unique_lock<mutex>& __lock, 128 const chrono::duration<_Rep, _Period>& __rtime, 129 _Predicate __p) 130 { return wait_until(__lock, __clock_t::now() + __rtime, std::move(__p)); } 131 132 native_handle_type 133 native_handle() 134 { return &_M_cond; } 135 136 private: 137 template<typename _Clock, typename _Duration> 138 bool 139 __wait_until_impl(unique_lock<mutex>& __lock, 140 const chrono::time_point<_Clock, _Duration>& __atime) 141 { 142 chrono::time_point<__clock_t, chrono::seconds> __s = 143 chrono::time_point_cast<chrono::seconds>(__atime); 144 145 chrono::nanoseconds __ns = 146 chrono::duration_cast<chrono::nanoseconds>(__atime - __s); 147 148 __gthread_time_t __ts = 149 { 150 static_cast<std::time_t>(__s.time_since_epoch().count()), 151 static_cast<long>(__ns.count()) 152 }; 153 154 __gthread_cond_timedwait(&_M_cond, __lock.mutex()->native_handle(), 155 &__ts); 156 157 return _Clock::now() < __atime; 158 } 159 }; 160 161 /// condition_variable_any 162 // Like above, only mutex may not have try_lock. 163 class condition_variable_any 164 { 165 typedef __gthread_cond_t __native_type; 166 __native_type _M_cond; 167 168 public: 169 typedef __native_type* native_handle_type; 170 171 condition_variable_any(); 172 ~condition_variable_any(); 173 174 condition_variable_any(const condition_variable_any&) = delete; 175 condition_variable_any& operator=(const condition_variable_any&) = delete; 176 177 void 178 notify_one(); 179 180 void 181 notify_all(); 182 183 template<typename _Lock> 184 void 185 wait(_Lock& __lock); 186 187 template<typename _Lock, typename _Predicate> 188 void 189 wait(_Lock& __lock, _Predicate __p); 190 191 template<typename _Lock, typename _Clock, typename _Duration> 192 bool 193 wait_until(_Lock& __lock, 194 const chrono::time_point<_Clock, _Duration>& __atime); 195 196 template<typename _Lock, typename _Clock, 197 typename _Duration, typename _Predicate> 198 bool 199 wait_until(_Lock& __lock, 200 const chrono::time_point<_Clock, _Duration>& __atime, 201 _Predicate __p); 202 203 template<typename _Lock, typename _Rep, typename _Period> 204 bool 205 wait_for(_Lock& __lock, const chrono::duration<_Rep, _Period>& __rtime); 206 207 template<typename _Lock, typename _Rep, 208 typename _Period, typename _Predicate> 209 bool 210 wait_for(_Lock& __lock, 211 const chrono::duration<_Rep, _Period>& __rtime, _Predicate __p); 212 213 native_handle_type 214 native_handle() 215 { return &_M_cond; } 216 }; 217 218 // @} group condition_variables 219 } 220 221 #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1 222 223 #endif // __GXX_EXPERIMENTAL_CXX0X__ 224 225 #endif // _GLIBCXX_CONDITION_VARIABLE 226
