1 // -*- C++ -*- 2 //===---------------------- condition_variable ----------------------------===// 3 // 4 // The LLVM Compiler Infrastructure 5 // 6 // This file is dual licensed under the MIT and the University of Illinois Open 7 // Source Licenses. See LICENSE.TXT for details. 8 // 9 //===----------------------------------------------------------------------===// 10 11 #ifndef _LIBCPP_CONDITION_VARIABLE 12 #define _LIBCPP_CONDITION_VARIABLE 13 14 /* 15 condition_variable synopsis 16 17 namespace std 18 { 19 20 enum class cv_status { no_timeout, timeout }; 21 22 class condition_variable 23 { 24 public: 25 condition_variable(); 26 ~condition_variable(); 27 28 condition_variable(const condition_variable&) = delete; 29 condition_variable& operator=(const condition_variable&) = delete; 30 31 void notify_one() noexcept; 32 void notify_all() noexcept; 33 34 void wait(unique_lock<mutex>& lock); 35 template <class Predicate> 36 void wait(unique_lock<mutex>& lock, Predicate pred); 37 38 template <class Clock, class Duration> 39 cv_status 40 wait_until(unique_lock<mutex>& lock, 41 const chrono::time_point<Clock, Duration>& abs_time); 42 43 template <class Clock, class Duration, class Predicate> 44 bool 45 wait_until(unique_lock<mutex>& lock, 46 const chrono::time_point<Clock, Duration>& abs_time, 47 Predicate pred); 48 49 template <class Rep, class Period> 50 cv_status 51 wait_for(unique_lock<mutex>& lock, 52 const chrono::duration<Rep, Period>& rel_time); 53 54 template <class Rep, class Period, class Predicate> 55 bool 56 wait_for(unique_lock<mutex>& lock, 57 const chrono::duration<Rep, Period>& rel_time, 58 Predicate pred); 59 60 typedef pthread_cond_t* native_handle_type; 61 native_handle_type native_handle(); 62 }; 63 64 void notify_all_at_thread_exit(condition_variable& cond, unique_lock<mutex> lk); 65 66 class condition_variable_any 67 { 68 public: 69 condition_variable_any(); 70 ~condition_variable_any(); 71 72 condition_variable_any(const condition_variable_any&) = delete; 73 condition_variable_any& operator=(const condition_variable_any&) = delete; 74 75 void notify_one() noexcept; 76 void notify_all() noexcept; 77 78 template <class Lock> 79 void wait(Lock& lock); 80 template <class Lock, class Predicate> 81 void wait(Lock& lock, Predicate pred); 82 83 template <class Lock, class Clock, class Duration> 84 cv_status 85 wait_until(Lock& lock, 86 const chrono::time_point<Clock, Duration>& abs_time); 87 88 template <class Lock, class Clock, class Duration, class Predicate> 89 bool 90 wait_until(Lock& lock, 91 const chrono::time_point<Clock, Duration>& abs_time, 92 Predicate pred); 93 94 template <class Lock, class Rep, class Period> 95 cv_status 96 wait_for(Lock& lock, 97 const chrono::duration<Rep, Period>& rel_time); 98 99 template <class Lock, class Rep, class Period, class Predicate> 100 bool 101 wait_for(Lock& lock, 102 const chrono::duration<Rep, Period>& rel_time, 103 Predicate pred); 104 }; 105 106 } // std 107 108 */ 109 110 #include <__config> 111 #include <__mutex_base> 112 #include <memory> 113 114 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 115 #pragma GCC system_header 116 #endif 117 118 _LIBCPP_BEGIN_NAMESPACE_STD 119 120 class _LIBCPP_VISIBLE condition_variable_any 121 { 122 condition_variable __cv_; 123 shared_ptr<mutex> __mut_; 124 public: 125 condition_variable_any(); 126 127 void notify_one() _NOEXCEPT; 128 void notify_all() _NOEXCEPT; 129 130 template <class _Lock> 131 void wait(_Lock& __lock); 132 template <class _Lock, class _Predicate> 133 void wait(_Lock& __lock, _Predicate __pred); 134 135 template <class _Lock, class _Clock, class _Duration> 136 cv_status 137 wait_until(_Lock& __lock, 138 const chrono::time_point<_Clock, _Duration>& __t); 139 140 template <class _Lock, class _Clock, class _Duration, class _Predicate> 141 bool 142 wait_until(_Lock& __lock, 143 const chrono::time_point<_Clock, _Duration>& __t, 144 _Predicate __pred); 145 146 template <class _Lock, class _Rep, class _Period> 147 cv_status 148 wait_for(_Lock& __lock, 149 const chrono::duration<_Rep, _Period>& __d); 150 151 template <class _Lock, class _Rep, class _Period, class _Predicate> 152 bool 153 wait_for(_Lock& __lock, 154 const chrono::duration<_Rep, _Period>& __d, 155 _Predicate __pred); 156 }; 157 158 inline _LIBCPP_INLINE_VISIBILITY 159 condition_variable_any::condition_variable_any() 160 : __mut_(make_shared<mutex>()) {} 161 162 inline _LIBCPP_INLINE_VISIBILITY 163 void 164 condition_variable_any::notify_one() _NOEXCEPT 165 { 166 {lock_guard<mutex> __lx(*__mut_);} 167 __cv_.notify_one(); 168 } 169 170 inline _LIBCPP_INLINE_VISIBILITY 171 void 172 condition_variable_any::notify_all() _NOEXCEPT 173 { 174 {lock_guard<mutex> __lx(*__mut_);} 175 __cv_.notify_all(); 176 } 177 178 struct __lock_external 179 { 180 template <class _Lock> 181 void operator()(_Lock* __m) {__m->lock();} 182 }; 183 184 template <class _Lock> 185 void 186 condition_variable_any::wait(_Lock& __lock) 187 { 188 shared_ptr<mutex> __mut = __mut_; 189 unique_lock<mutex> __lk(*__mut); 190 __lock.unlock(); 191 unique_ptr<_Lock, __lock_external> __lxx(&__lock); 192 lock_guard<unique_lock<mutex> > __lx(__lk, adopt_lock); 193 __cv_.wait(__lk); 194 } // __mut_.unlock(), __lock.lock() 195 196 template <class _Lock, class _Predicate> 197 inline _LIBCPP_INLINE_VISIBILITY 198 void 199 condition_variable_any::wait(_Lock& __lock, _Predicate __pred) 200 { 201 while (!__pred()) 202 wait(__lock); 203 } 204 205 template <class _Lock, class _Clock, class _Duration> 206 cv_status 207 condition_variable_any::wait_until(_Lock& __lock, 208 const chrono::time_point<_Clock, _Duration>& __t) 209 { 210 shared_ptr<mutex> __mut = __mut_; 211 unique_lock<mutex> __lk(*__mut); 212 __lock.unlock(); 213 unique_ptr<_Lock, __lock_external> __lxx(&__lock); 214 lock_guard<unique_lock<mutex> > __lx(__lk, adopt_lock); 215 return __cv_.wait_until(__lk, __t); 216 } // __mut_.unlock(), __lock.lock() 217 218 template <class _Lock, class _Clock, class _Duration, class _Predicate> 219 inline _LIBCPP_INLINE_VISIBILITY 220 bool 221 condition_variable_any::wait_until(_Lock& __lock, 222 const chrono::time_point<_Clock, _Duration>& __t, 223 _Predicate __pred) 224 { 225 while (!__pred()) 226 if (wait_until(__lock, __t) == cv_status::timeout) 227 return __pred(); 228 return true; 229 } 230 231 template <class _Lock, class _Rep, class _Period> 232 inline _LIBCPP_INLINE_VISIBILITY 233 cv_status 234 condition_variable_any::wait_for(_Lock& __lock, 235 const chrono::duration<_Rep, _Period>& __d) 236 { 237 return wait_until(__lock, chrono::steady_clock::now() + __d); 238 } 239 240 template <class _Lock, class _Rep, class _Period, class _Predicate> 241 inline _LIBCPP_INLINE_VISIBILITY 242 bool 243 condition_variable_any::wait_for(_Lock& __lock, 244 const chrono::duration<_Rep, _Period>& __d, 245 _Predicate __pred) 246 { 247 return wait_until(__lock, chrono::steady_clock::now() + __d, 248 _VSTD::move(__pred)); 249 } 250 251 _LIBCPP_VISIBLE 252 void notify_all_at_thread_exit(condition_variable& cond, unique_lock<mutex> lk); 253 254 _LIBCPP_END_NAMESPACE_STD 255 256 #endif // _LIBCPP_CONDITION_VARIABLE 257
