__mutex_base revision 227825
1139747Simp// -*- C++ -*- 24Srgrimes//===----------------------------------------------------------------------===// 34Srgrimes// 44Srgrimes// The LLVM Compiler Infrastructure 58876Srgrimes// 64Srgrimes// This file is dual licensed under the MIT and the University of Illinois Open 74Srgrimes// Source Licenses. See LICENSE.TXT for details. 84Srgrimes// 94Srgrimes//===----------------------------------------------------------------------===// 104Srgrimes 118876Srgrimes#ifndef _LIBCPP___MUTEX_BASE 128876Srgrimes#define _LIBCPP___MUTEX_BASE 134Srgrimes 144Srgrimes#include <__config> 158876Srgrimes#include <chrono> 164Srgrimes#include <system_error> 178876Srgrimes#include <pthread.h> 184Srgrimes 194Srgrimes#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 204Srgrimes#pragma GCC system_header 214Srgrimes#endif 228876Srgrimes 234Srgrimes#ifdef _LIBCPP_SHARED_LOCK 244Srgrimes 254Srgrimesnamespace ting { 2650477Spetertemplate <class _Mutex> class shared_lock; 274Srgrimestemplate <class _Mutex> class upgrade_lock; 28623Srgrimes} 294Srgrimes 30273265Spfg#endif // _LIBCPP_SHARED_LOCK 314Srgrimes 324Srgrimes 334Srgrimes_LIBCPP_BEGIN_NAMESPACE_STD 3412472Sbde 3512472Sbdeclass _LIBCPP_VISIBLE mutex 364Srgrimes{ 374Srgrimes pthread_mutex_t __m_; 384Srgrimes 394Srgrimespublic: 404Srgrimes _LIBCPP_INLINE_VISIBILITY 414Srgrimes mutex() {__m_ = (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER;} 424Srgrimes ~mutex(); 434Srgrimes 444Srgrimesprivate: 454Srgrimes mutex(const mutex&);// = delete; 464Srgrimes mutex& operator=(const mutex&);// = delete; 474Srgrimes 4812472Sbdepublic: 49 void lock(); 50 bool try_lock(); 51 void unlock(); 52 53 typedef pthread_mutex_t* native_handle_type; 54 _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__m_;} 55}; 56 57struct _LIBCPP_VISIBLE defer_lock_t {}; 58struct _LIBCPP_VISIBLE try_to_lock_t {}; 59struct _LIBCPP_VISIBLE adopt_lock_t {}; 60 61//constexpr 62extern const 63defer_lock_t defer_lock; 64 65//constexpr 66extern const 67try_to_lock_t try_to_lock; 68 69//constexpr 70extern const 71adopt_lock_t adopt_lock; 72 73template <class _Mutex> 74class _LIBCPP_VISIBLE lock_guard 75{ 76public: 77 typedef _Mutex mutex_type; 78 79private: 80 mutex_type& __m_; 81public: 82 83 _LIBCPP_INLINE_VISIBILITY 84 explicit lock_guard(mutex_type& __m) 85 : __m_(__m) {__m_.lock();} 86 _LIBCPP_INLINE_VISIBILITY 87 lock_guard(mutex_type& __m, adopt_lock_t) 88 : __m_(__m) {} 89 _LIBCPP_INLINE_VISIBILITY 90 ~lock_guard() {__m_.unlock();} 91 92private: 93 lock_guard(lock_guard const&);// = delete; 94 lock_guard& operator=(lock_guard const&);// = delete; 95}; 96 97template <class _Mutex> 98class _LIBCPP_VISIBLE unique_lock 99{ 100public: 101 typedef _Mutex mutex_type; 102 103private: 104 mutex_type* __m_; 105 bool __owns_; 106 107public: 108 _LIBCPP_INLINE_VISIBILITY 109 unique_lock() : __m_(nullptr), __owns_(false) {} 110 _LIBCPP_INLINE_VISIBILITY 111 explicit unique_lock(mutex_type& __m) 112 : __m_(&__m), __owns_(true) {__m_->lock();} 113 _LIBCPP_INLINE_VISIBILITY 114 unique_lock(mutex_type& __m, defer_lock_t) 115 : __m_(&__m), __owns_(false) {} 116 _LIBCPP_INLINE_VISIBILITY 117 unique_lock(mutex_type& __m, try_to_lock_t) 118 : __m_(&__m), __owns_(__m.try_lock()) {} 119 _LIBCPP_INLINE_VISIBILITY 120 unique_lock(mutex_type& __m, adopt_lock_t) 121 : __m_(&__m), __owns_(true) {} 122 template <class _Clock, class _Duration> 123 _LIBCPP_INLINE_VISIBILITY 124 unique_lock(mutex_type& __m, const chrono::time_point<_Clock, _Duration>& __t) 125 : __m_(&__m), __owns_(__m.try_lock_until(__t)) {} 126 template <class _Rep, class _Period> 127 _LIBCPP_INLINE_VISIBILITY 128 unique_lock(mutex_type& __m, const chrono::duration<_Rep, _Period>& __d) 129 : __m_(&__m), __owns_(__m.try_lock_for(__d)) {} 130 _LIBCPP_INLINE_VISIBILITY 131 ~unique_lock() 132 { 133 if (__owns_) 134 __m_->unlock(); 135 } 136 137private: 138 unique_lock(unique_lock const&); // = delete; 139 unique_lock& operator=(unique_lock const&); // = delete; 140 141public: 142#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 143 _LIBCPP_INLINE_VISIBILITY 144 unique_lock(unique_lock&& __u) 145 : __m_(__u.__m_), __owns_(__u.__owns_) 146 {__u.__m_ = nullptr; __u.__owns_ = false;} 147 _LIBCPP_INLINE_VISIBILITY 148 unique_lock& operator=(unique_lock&& __u) 149 { 150 if (__owns_) 151 __m_->unlock(); 152 __m_ = __u.__m_; 153 __owns_ = __u.__owns_; 154 __u.__m_ = nullptr; 155 __u.__owns_ = false; 156 return *this; 157 } 158 159#ifdef _LIBCPP_SHARED_LOCK 160 161 unique_lock(ting::shared_lock<mutex_type>&&, try_to_lock_t); 162 template <class _Clock, class _Duration> 163 unique_lock(ting::shared_lock<mutex_type>&&, 164 const chrono::time_point<_Clock, _Duration>&); 165 template <class _Rep, class _Period> 166 unique_lock(ting::shared_lock<mutex_type>&&, 167 const chrono::duration<_Rep, _Period>&); 168 169 explicit unique_lock(ting::upgrade_lock<mutex_type>&&); 170 unique_lock(ting::upgrade_lock<mutex_type>&&, try_to_lock_t); 171 template <class _Clock, class _Duration> 172 unique_lock(ting::upgrade_lock<mutex_type>&&, 173 const chrono::time_point<_Clock, _Duration>&); 174 template <class _Rep, class _Period> 175 unique_lock(ting::upgrade_lock<mutex_type>&&, 176 const chrono::duration<_Rep, _Period>&); 177 178#endif // _LIBCPP_SHARED_LOCK 179 180#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 181 182 void lock(); 183 bool try_lock(); 184 185 template <class _Rep, class _Period> 186 bool try_lock_for(const chrono::duration<_Rep, _Period>& __d); 187 template <class _Clock, class _Duration> 188 bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t); 189 190 void unlock(); 191 192 _LIBCPP_INLINE_VISIBILITY 193 void swap(unique_lock& __u) 194 { 195 _VSTD::swap(__m_, __u.__m_); 196 _VSTD::swap(__owns_, __u.__owns_); 197 } 198 _LIBCPP_INLINE_VISIBILITY 199 mutex_type* release() 200 { 201 mutex_type* __m = __m_; 202 __m_ = nullptr; 203 __owns_ = false; 204 return __m; 205 } 206 207 _LIBCPP_INLINE_VISIBILITY 208 bool owns_lock() const {return __owns_;} 209 _LIBCPP_INLINE_VISIBILITY 210// explicit 211 operator bool () const {return __owns_;} 212 _LIBCPP_INLINE_VISIBILITY 213 mutex_type* mutex() const {return __m_;} 214}; 215 216template <class _Mutex> 217void 218unique_lock<_Mutex>::lock() 219{ 220 if (__m_ == nullptr) 221 __throw_system_error(EPERM, "unique_lock::lock: references null mutex"); 222 if (__owns_) 223 __throw_system_error(EDEADLK, "unique_lock::lock: already locked"); 224 __m_->lock(); 225 __owns_ = true; 226} 227 228template <class _Mutex> 229bool 230unique_lock<_Mutex>::try_lock() 231{ 232 if (__m_ == nullptr) 233 __throw_system_error(EPERM, "unique_lock::try_lock: references null mutex"); 234 if (__owns_) 235 __throw_system_error(EDEADLK, "unique_lock::try_lock: already locked"); 236 __owns_ = __m_->try_lock(); 237 return __owns_; 238} 239 240template <class _Mutex> 241template <class _Rep, class _Period> 242bool 243unique_lock<_Mutex>::try_lock_for(const chrono::duration<_Rep, _Period>& __d) 244{ 245 if (__m_ == nullptr) 246 __throw_system_error(EPERM, "unique_lock::try_lock_for: references null mutex"); 247 if (__owns_) 248 __throw_system_error(EDEADLK, "unique_lock::try_lock_for: already locked"); 249 __owns_ = __m_->try_lock_for(__d); 250 return __owns_; 251} 252 253template <class _Mutex> 254template <class _Clock, class _Duration> 255bool 256unique_lock<_Mutex>::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t) 257{ 258 if (__m_ == nullptr) 259 __throw_system_error(EPERM, "unique_lock::try_lock_until: references null mutex"); 260 if (__owns_) 261 __throw_system_error(EDEADLK, "unique_lock::try_lock_until: already locked"); 262 __owns_ = __m_->try_lock_until(__t); 263 return __owns_; 264} 265 266template <class _Mutex> 267void 268unique_lock<_Mutex>::unlock() 269{ 270 if (!__owns_) 271 __throw_system_error(EPERM, "unique_lock::unlock: not locked"); 272 __m_->unlock(); 273 __owns_ = false; 274} 275 276template <class _Mutex> 277inline _LIBCPP_INLINE_VISIBILITY 278void 279swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>& __y) {__x.swap(__y);} 280 281struct _LIBCPP_VISIBLE cv_status 282{ 283 enum _ { 284 no_timeout, 285 timeout 286 }; 287 288 _ __v_; 289 290 _LIBCPP_INLINE_VISIBILITY cv_status(_ __v) : __v_(__v) {} 291 _LIBCPP_INLINE_VISIBILITY operator int() const {return __v_;} 292 293}; 294 295class _LIBCPP_VISIBLE condition_variable 296{ 297 pthread_cond_t __cv_; 298public: 299 _LIBCPP_INLINE_VISIBILITY 300 condition_variable() {__cv_ = (pthread_cond_t)PTHREAD_COND_INITIALIZER;} 301 ~condition_variable(); 302 303private: 304 condition_variable(const condition_variable&); // = delete; 305 condition_variable& operator=(const condition_variable&); // = delete; 306 307public: 308 void notify_one(); 309 void notify_all(); 310 311 void wait(unique_lock<mutex>& __lk); 312 template <class _Predicate> 313 void wait(unique_lock<mutex>& __lk, _Predicate __pred); 314 315 template <class _Duration> 316 cv_status 317 wait_until(unique_lock<mutex>& __lk, 318 const chrono::time_point<chrono::system_clock, _Duration>& __t); 319 320 template <class _Clock, class _Duration> 321 cv_status 322 wait_until(unique_lock<mutex>& __lk, 323 const chrono::time_point<_Clock, _Duration>& __t); 324 325 template <class _Clock, class _Duration, class _Predicate> 326 bool 327 wait_until(unique_lock<mutex>& __lk, 328 const chrono::time_point<_Clock, _Duration>& __t, 329 _Predicate __pred); 330 331 template <class _Rep, class _Period> 332 cv_status 333 wait_for(unique_lock<mutex>& __lk, 334 const chrono::duration<_Rep, _Period>& __d); 335 336 template <class _Rep, class _Period, class _Predicate> 337 bool 338 wait_for(unique_lock<mutex>& __lk, 339 const chrono::duration<_Rep, _Period>& __d, 340 _Predicate __pred); 341 342 typedef pthread_cond_t* native_handle_type; 343 _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__cv_;} 344 345private: 346 void __do_timed_wait(unique_lock<mutex>& __lk, 347 chrono::time_point<chrono::system_clock, chrono::nanoseconds>); 348}; 349 350template <class _To, class _Rep, class _Period> 351inline _LIBCPP_INLINE_VISIBILITY 352typename enable_if 353< 354 chrono::__is_duration<_To>::value, 355 _To 356>::type 357__ceil(chrono::duration<_Rep, _Period> __d) 358{ 359 using namespace chrono; 360 _To __r = duration_cast<_To>(__d); 361 if (__r < __d) 362 ++__r; 363 return __r; 364} 365 366template <class _Predicate> 367void 368condition_variable::wait(unique_lock<mutex>& __lk, _Predicate __pred) 369{ 370 while (!__pred()) 371 wait(__lk); 372} 373 374template <class _Duration> 375cv_status 376condition_variable::wait_until(unique_lock<mutex>& __lk, 377 const chrono::time_point<chrono::system_clock, _Duration>& __t) 378{ 379 using namespace chrono; 380 typedef time_point<system_clock, nanoseconds> __nano_sys_tmpt; 381 __do_timed_wait(__lk, 382 __nano_sys_tmpt(__ceil<nanoseconds>(__t.time_since_epoch()))); 383 return system_clock::now() < __t ? cv_status::no_timeout : 384 cv_status::timeout; 385} 386 387template <class _Clock, class _Duration> 388cv_status 389condition_variable::wait_until(unique_lock<mutex>& __lk, 390 const chrono::time_point<_Clock, _Duration>& __t) 391{ 392 using namespace chrono; 393 system_clock::time_point __s_now = system_clock::now(); 394 typename _Clock::time_point __c_now = _Clock::now(); 395 __do_timed_wait(__lk, __s_now + __ceil<nanoseconds>(__t - __c_now)); 396 return _Clock::now() < __t ? cv_status::no_timeout : cv_status::timeout; 397} 398 399template <class _Clock, class _Duration, class _Predicate> 400bool 401condition_variable::wait_until(unique_lock<mutex>& __lk, 402 const chrono::time_point<_Clock, _Duration>& __t, 403 _Predicate __pred) 404{ 405 while (!__pred()) 406 { 407 if (wait_until(__lk, __t) == cv_status::timeout) 408 return __pred(); 409 } 410 return true; 411} 412 413template <class _Rep, class _Period> 414cv_status 415condition_variable::wait_for(unique_lock<mutex>& __lk, 416 const chrono::duration<_Rep, _Period>& __d) 417{ 418 using namespace chrono; 419 system_clock::time_point __s_now = system_clock::now(); 420 steady_clock::time_point __c_now = steady_clock::now(); 421 __do_timed_wait(__lk, __s_now + __ceil<nanoseconds>(__d)); 422 return steady_clock::now() - __c_now < __d ? cv_status::no_timeout : 423 cv_status::timeout; 424} 425 426template <class _Rep, class _Period, class _Predicate> 427inline _LIBCPP_INLINE_VISIBILITY 428bool 429condition_variable::wait_for(unique_lock<mutex>& __lk, 430 const chrono::duration<_Rep, _Period>& __d, 431 _Predicate __pred) 432{ 433 return wait_until(__lk, chrono::steady_clock::now() + __d, 434 _VSTD::move(__pred)); 435} 436 437_LIBCPP_END_NAMESPACE_STD 438 439#endif // _LIBCPP___MUTEX_BASE 440