__mutex_base revision 261272
1251881Speter// -*- C++ -*- 2251881Speter//===----------------------------------------------------------------------===// 3251881Speter// 4251881Speter// The LLVM Compiler Infrastructure 5251881Speter// 6251881Speter// This file is dual licensed under the MIT and the University of Illinois Open 7251881Speter// Source Licenses. See LICENSE.TXT for details. 8251881Speter// 9251881Speter//===----------------------------------------------------------------------===// 10251881Speter 11251881Speter#ifndef _LIBCPP___MUTEX_BASE 12251881Speter#define _LIBCPP___MUTEX_BASE 13251881Speter 14251881Speter#include <__config> 15251881Speter#include <chrono> 16251881Speter#include <system_error> 17251881Speter#include <pthread.h> 18251881Speter 19251881Speter#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 20251881Speter#pragma GCC system_header 21251881Speter#endif 22251881Speter 23251881Speter_LIBCPP_BEGIN_NAMESPACE_STD 24251881Speter 25251881Speterclass _LIBCPP_TYPE_VIS mutex 26251881Speter{ 27251881Speter pthread_mutex_t __m_; 28251881Speter 29251881Speterpublic: 30251881Speter _LIBCPP_INLINE_VISIBILITY 31251881Speter#ifndef _LIBCPP_HAS_NO_CONSTEXPR 32251881Speter constexpr mutex() _NOEXCEPT : __m_(PTHREAD_MUTEX_INITIALIZER) {} 33251881Speter#else 34251881Speter mutex() _NOEXCEPT {__m_ = (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER;} 35251881Speter#endif 36251881Speter ~mutex(); 37251881Speter 38251881Speterprivate: 39251881Speter mutex(const mutex&);// = delete; 40251881Speter mutex& operator=(const mutex&);// = delete; 41251881Speter 42251881Speterpublic: 43251881Speter void lock(); 44251881Speter bool try_lock() _NOEXCEPT; 45251881Speter void unlock() _NOEXCEPT; 46251881Speter 47251881Speter typedef pthread_mutex_t* native_handle_type; 48251881Speter _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__m_;} 49251881Speter}; 50251881Speter 51251881Speterstruct _LIBCPP_TYPE_VIS defer_lock_t {}; 52251881Speterstruct _LIBCPP_TYPE_VIS try_to_lock_t {}; 53251881Speterstruct _LIBCPP_TYPE_VIS adopt_lock_t {}; 54251881Speter 55251881Speter#if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_MUTEX) 56251881Speter 57251881Speterextern const defer_lock_t defer_lock; 58251881Speterextern const try_to_lock_t try_to_lock; 59251881Speterextern const adopt_lock_t adopt_lock; 60251881Speter 61251881Speter#else 62251881Speter 63251881Speterconstexpr defer_lock_t defer_lock = defer_lock_t(); 64251881Speterconstexpr try_to_lock_t try_to_lock = try_to_lock_t(); 65251881Speterconstexpr adopt_lock_t adopt_lock = adopt_lock_t(); 66251881Speter 67251881Speter#endif 68251881Speter 69251881Spetertemplate <class _Mutex> 70251881Speterclass _LIBCPP_TYPE_VIS_ONLY lock_guard 71251881Speter{ 72251881Speterpublic: 73251881Speter typedef _Mutex mutex_type; 74251881Speter 75251881Speterprivate: 76251881Speter mutex_type& __m_; 77251881Speterpublic: 78251881Speter 79251881Speter _LIBCPP_INLINE_VISIBILITY 80251881Speter explicit lock_guard(mutex_type& __m) 81251881Speter : __m_(__m) {__m_.lock();} 82251881Speter _LIBCPP_INLINE_VISIBILITY 83251881Speter lock_guard(mutex_type& __m, adopt_lock_t) 84251881Speter : __m_(__m) {} 85251881Speter _LIBCPP_INLINE_VISIBILITY 86251881Speter ~lock_guard() {__m_.unlock();} 87251881Speter 88251881Speterprivate: 89251881Speter lock_guard(lock_guard const&);// = delete; 90251881Speter lock_guard& operator=(lock_guard const&);// = delete; 91251881Speter}; 92251881Speter 93251881Spetertemplate <class _Mutex> 94251881Speterclass _LIBCPP_TYPE_VIS_ONLY unique_lock 95251881Speter{ 96251881Speterpublic: 97251881Speter typedef _Mutex mutex_type; 98251881Speter 99251881Speterprivate: 100251881Speter mutex_type* __m_; 101251881Speter bool __owns_; 102251881Speter 103251881Speterpublic: 104251881Speter _LIBCPP_INLINE_VISIBILITY 105251881Speter unique_lock() _NOEXCEPT : __m_(nullptr), __owns_(false) {} 106251881Speter _LIBCPP_INLINE_VISIBILITY 107251881Speter explicit unique_lock(mutex_type& __m) 108251881Speter : __m_(&__m), __owns_(true) {__m_->lock();} 109251881Speter _LIBCPP_INLINE_VISIBILITY 110251881Speter unique_lock(mutex_type& __m, defer_lock_t) _NOEXCEPT 111251881Speter : __m_(&__m), __owns_(false) {} 112251881Speter _LIBCPP_INLINE_VISIBILITY 113251881Speter unique_lock(mutex_type& __m, try_to_lock_t) 114251881Speter : __m_(&__m), __owns_(__m.try_lock()) {} 115251881Speter _LIBCPP_INLINE_VISIBILITY 116251881Speter unique_lock(mutex_type& __m, adopt_lock_t) 117251881Speter : __m_(&__m), __owns_(true) {} 118251881Speter template <class _Clock, class _Duration> 119251881Speter _LIBCPP_INLINE_VISIBILITY 120251881Speter unique_lock(mutex_type& __m, const chrono::time_point<_Clock, _Duration>& __t) 121251881Speter : __m_(&__m), __owns_(__m.try_lock_until(__t)) {} 122251881Speter template <class _Rep, class _Period> 123251881Speter _LIBCPP_INLINE_VISIBILITY 124251881Speter unique_lock(mutex_type& __m, const chrono::duration<_Rep, _Period>& __d) 125251881Speter : __m_(&__m), __owns_(__m.try_lock_for(__d)) {} 126251881Speter _LIBCPP_INLINE_VISIBILITY 127251881Speter ~unique_lock() 128251881Speter { 129251881Speter if (__owns_) 130251881Speter __m_->unlock(); 131251881Speter } 132251881Speter 133251881Speterprivate: 134251881Speter unique_lock(unique_lock const&); // = delete; 135251881Speter unique_lock& operator=(unique_lock const&); // = delete; 136251881Speter 137251881Speterpublic: 138251881Speter#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 139251881Speter _LIBCPP_INLINE_VISIBILITY 140251881Speter unique_lock(unique_lock&& __u) _NOEXCEPT 141251881Speter : __m_(__u.__m_), __owns_(__u.__owns_) 142251881Speter {__u.__m_ = nullptr; __u.__owns_ = false;} 143251881Speter _LIBCPP_INLINE_VISIBILITY 144251881Speter unique_lock& operator=(unique_lock&& __u) _NOEXCEPT 145251881Speter { 146251881Speter if (__owns_) 147251881Speter __m_->unlock(); 148251881Speter __m_ = __u.__m_; 149251881Speter __owns_ = __u.__owns_; 150251881Speter __u.__m_ = nullptr; 151251881Speter __u.__owns_ = false; 152251881Speter return *this; 153251881Speter } 154251881Speter 155251881Speter#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 156251881Speter 157251881Speter void lock(); 158251881Speter bool try_lock(); 159251881Speter 160251881Speter template <class _Rep, class _Period> 161251881Speter bool try_lock_for(const chrono::duration<_Rep, _Period>& __d); 162251881Speter template <class _Clock, class _Duration> 163251881Speter bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t); 164251881Speter 165251881Speter void unlock(); 166251881Speter 167251881Speter _LIBCPP_INLINE_VISIBILITY 168251881Speter void swap(unique_lock& __u) _NOEXCEPT 169251881Speter { 170251881Speter _VSTD::swap(__m_, __u.__m_); 171251881Speter _VSTD::swap(__owns_, __u.__owns_); 172251881Speter } 173251881Speter _LIBCPP_INLINE_VISIBILITY 174251881Speter mutex_type* release() _NOEXCEPT 175251881Speter { 176251881Speter mutex_type* __m = __m_; 177251881Speter __m_ = nullptr; 178251881Speter __owns_ = false; 179251881Speter return __m; 180251881Speter } 181251881Speter 182251881Speter _LIBCPP_INLINE_VISIBILITY 183251881Speter bool owns_lock() const _NOEXCEPT {return __owns_;} 184251881Speter _LIBCPP_INLINE_VISIBILITY 185251881Speter _LIBCPP_EXPLICIT 186251881Speter operator bool () const _NOEXCEPT {return __owns_;} 187251881Speter _LIBCPP_INLINE_VISIBILITY 188251881Speter mutex_type* mutex() const _NOEXCEPT {return __m_;} 189251881Speter}; 190251881Speter 191251881Spetertemplate <class _Mutex> 192251881Spetervoid 193251881Speterunique_lock<_Mutex>::lock() 194251881Speter{ 195251881Speter if (__m_ == nullptr) 196251881Speter __throw_system_error(EPERM, "unique_lock::lock: references null mutex"); 197251881Speter if (__owns_) 198251881Speter __throw_system_error(EDEADLK, "unique_lock::lock: already locked"); 199251881Speter __m_->lock(); 200251881Speter __owns_ = true; 201251881Speter} 202251881Speter 203251881Spetertemplate <class _Mutex> 204251881Speterbool 205251881Speterunique_lock<_Mutex>::try_lock() 206251881Speter{ 207251881Speter if (__m_ == nullptr) 208251881Speter __throw_system_error(EPERM, "unique_lock::try_lock: references null mutex"); 209251881Speter if (__owns_) 210251881Speter __throw_system_error(EDEADLK, "unique_lock::try_lock: already locked"); 211251881Speter __owns_ = __m_->try_lock(); 212251881Speter return __owns_; 213251881Speter} 214251881Speter 215251881Spetertemplate <class _Mutex> 216251881Spetertemplate <class _Rep, class _Period> 217251881Speterbool 218251881Speterunique_lock<_Mutex>::try_lock_for(const chrono::duration<_Rep, _Period>& __d) 219251881Speter{ 220251881Speter if (__m_ == nullptr) 221251881Speter __throw_system_error(EPERM, "unique_lock::try_lock_for: references null mutex"); 222251881Speter if (__owns_) 223251881Speter __throw_system_error(EDEADLK, "unique_lock::try_lock_for: already locked"); 224251881Speter __owns_ = __m_->try_lock_for(__d); 225251881Speter return __owns_; 226251881Speter} 227251881Speter 228251881Spetertemplate <class _Mutex> 229251881Spetertemplate <class _Clock, class _Duration> 230251881Speterbool 231251881Speterunique_lock<_Mutex>::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t) 232251881Speter{ 233251881Speter if (__m_ == nullptr) 234251881Speter __throw_system_error(EPERM, "unique_lock::try_lock_until: references null mutex"); 235251881Speter if (__owns_) 236251881Speter __throw_system_error(EDEADLK, "unique_lock::try_lock_until: already locked"); 237251881Speter __owns_ = __m_->try_lock_until(__t); 238251881Speter return __owns_; 239251881Speter} 240251881Speter 241251881Spetertemplate <class _Mutex> 242251881Spetervoid 243251881Speterunique_lock<_Mutex>::unlock() 244251881Speter{ 245251881Speter if (!__owns_) 246251881Speter __throw_system_error(EPERM, "unique_lock::unlock: not locked"); 247251881Speter __m_->unlock(); 248251881Speter __owns_ = false; 249251881Speter} 250251881Speter 251251881Spetertemplate <class _Mutex> 252251881Speterinline _LIBCPP_INLINE_VISIBILITY 253251881Spetervoid 254251881Speterswap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>& __y) _NOEXCEPT 255251881Speter {__x.swap(__y);} 256251881Speter 257251881Speterstruct _LIBCPP_TYPE_VIS cv_status 258251881Speter{ 259251881Speter enum __lx { 260251881Speter no_timeout, 261251881Speter timeout 262251881Speter }; 263251881Speter 264251881Speter __lx __v_; 265251881Speter 266251881Speter _LIBCPP_INLINE_VISIBILITY cv_status(__lx __v) : __v_(__v) {} 267251881Speter _LIBCPP_INLINE_VISIBILITY operator int() const {return __v_;} 268251881Speter 269251881Speter}; 270251881Speter 271251881Speterclass _LIBCPP_TYPE_VIS condition_variable 272251881Speter{ 273251881Speter pthread_cond_t __cv_; 274251881Speterpublic: 275251881Speter _LIBCPP_INLINE_VISIBILITY 276251881Speter#ifndef _LIBCPP_HAS_NO_CONSTEXPR 277251881Speter constexpr condition_variable() : __cv_(PTHREAD_COND_INITIALIZER) {} 278251881Speter#else 279251881Speter condition_variable() {__cv_ = (pthread_cond_t)PTHREAD_COND_INITIALIZER;} 280251881Speter#endif 281251881Speter ~condition_variable(); 282251881Speter 283251881Speterprivate: 284251881Speter condition_variable(const condition_variable&); // = delete; 285251881Speter condition_variable& operator=(const condition_variable&); // = delete; 286251881Speter 287251881Speterpublic: 288251881Speter void notify_one() _NOEXCEPT; 289251881Speter void notify_all() _NOEXCEPT; 290251881Speter 291251881Speter void wait(unique_lock<mutex>& __lk); 292251881Speter template <class _Predicate> 293251881Speter void wait(unique_lock<mutex>& __lk, _Predicate __pred); 294251881Speter 295251881Speter template <class _Clock, class _Duration> 296251881Speter cv_status 297251881Speter wait_until(unique_lock<mutex>& __lk, 298251881Speter const chrono::time_point<_Clock, _Duration>& __t); 299251881Speter 300251881Speter template <class _Clock, class _Duration, class _Predicate> 301251881Speter bool 302251881Speter wait_until(unique_lock<mutex>& __lk, 303251881Speter const chrono::time_point<_Clock, _Duration>& __t, 304251881Speter _Predicate __pred); 305251881Speter 306251881Speter template <class _Rep, class _Period> 307251881Speter cv_status 308251881Speter wait_for(unique_lock<mutex>& __lk, 309251881Speter const chrono::duration<_Rep, _Period>& __d); 310251881Speter 311251881Speter template <class _Rep, class _Period, class _Predicate> 312251881Speter bool 313251881Speter wait_for(unique_lock<mutex>& __lk, 314251881Speter const chrono::duration<_Rep, _Period>& __d, 315251881Speter _Predicate __pred); 316251881Speter 317251881Speter typedef pthread_cond_t* native_handle_type; 318251881Speter _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__cv_;} 319251881Speter 320251881Speterprivate: 321251881Speter void __do_timed_wait(unique_lock<mutex>& __lk, 322251881Speter chrono::time_point<chrono::system_clock, chrono::nanoseconds>); 323251881Speter}; 324251881Speter 325251881Spetertemplate <class _To, class _Rep, class _Period> 326251881Speterinline _LIBCPP_INLINE_VISIBILITY 327251881Spetertypename enable_if 328251881Speter< 329251881Speter chrono::__is_duration<_To>::value, 330251881Speter _To 331251881Speter>::type 332251881Speter__ceil(chrono::duration<_Rep, _Period> __d) 333251881Speter{ 334251881Speter using namespace chrono; 335251881Speter _To __r = duration_cast<_To>(__d); 336251881Speter if (__r < __d) 337251881Speter ++__r; 338251881Speter return __r; 339251881Speter} 340251881Speter 341251881Spetertemplate <class _Predicate> 342251881Spetervoid 343251881Spetercondition_variable::wait(unique_lock<mutex>& __lk, _Predicate __pred) 344251881Speter{ 345251881Speter while (!__pred()) 346251881Speter wait(__lk); 347251881Speter} 348251881Speter 349251881Spetertemplate <class _Clock, class _Duration> 350251881Spetercv_status 351251881Spetercondition_variable::wait_until(unique_lock<mutex>& __lk, 352251881Speter const chrono::time_point<_Clock, _Duration>& __t) 353251881Speter{ 354251881Speter using namespace chrono; 355251881Speter wait_for(__lk, __t - _Clock::now()); 356251881Speter return _Clock::now() < __t ? cv_status::no_timeout : cv_status::timeout; 357251881Speter} 358251881Speter 359251881Spetertemplate <class _Clock, class _Duration, class _Predicate> 360251881Speterbool 361251881Spetercondition_variable::wait_until(unique_lock<mutex>& __lk, 362251881Speter const chrono::time_point<_Clock, _Duration>& __t, 363251881Speter _Predicate __pred) 364251881Speter{ 365251881Speter while (!__pred()) 366251881Speter { 367251881Speter if (wait_until(__lk, __t) == cv_status::timeout) 368251881Speter return __pred(); 369251881Speter } 370251881Speter return true; 371251881Speter} 372251881Speter 373251881Spetertemplate <class _Rep, class _Period> 374251881Spetercv_status 375251881Spetercondition_variable::wait_for(unique_lock<mutex>& __lk, 376251881Speter const chrono::duration<_Rep, _Period>& __d) 377251881Speter{ 378251881Speter using namespace chrono; 379251881Speter if (__d <= __d.zero()) 380251881Speter return cv_status::timeout; 381251881Speter typedef time_point<system_clock, duration<long double, nano> > __sys_tpf; 382251881Speter typedef time_point<system_clock, nanoseconds> __sys_tpi; 383251881Speter __sys_tpf _Max = __sys_tpi::max(); 384251881Speter system_clock::time_point __s_now = system_clock::now(); 385251881Speter steady_clock::time_point __c_now = steady_clock::now(); 386251881Speter if (_Max - __d > __s_now) 387251881Speter __do_timed_wait(__lk, __s_now + __ceil<nanoseconds>(__d)); 388251881Speter else 389251881Speter __do_timed_wait(__lk, __sys_tpi::max()); 390251881Speter return steady_clock::now() - __c_now < __d ? cv_status::no_timeout : 391251881Speter cv_status::timeout; 392251881Speter} 393251881Speter 394251881Spetertemplate <class _Rep, class _Period, class _Predicate> 395251881Speterinline _LIBCPP_INLINE_VISIBILITY 396251881Speterbool 397251881Spetercondition_variable::wait_for(unique_lock<mutex>& __lk, 398251881Speter const chrono::duration<_Rep, _Period>& __d, 399251881Speter _Predicate __pred) 400251881Speter{ 401251881Speter return wait_until(__lk, chrono::steady_clock::now() + __d, 402251881Speter _VSTD::move(__pred)); 403251881Speter} 404251881Speter 405251881Speter_LIBCPP_END_NAMESPACE_STD 406251881Speter 407251881Speter#endif // _LIBCPP___MUTEX_BASE 408251881Speter