1// -*- C++ -*- 2//===----------------------------------------------------------------------===// 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___MUTEX_BASE 12#define _LIBCPP___MUTEX_BASE 13 14#include <__config> 15#include <chrono> 16#include <system_error> 17#if !defined(__minix) 18#include <pthread.h> 19#else 20#define _MTHREADIFY_PTHREADS 1 21#include <minix/mthread.h> 22#endif /* !defined(__minix) */ 23 24#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 25#pragma GCC system_header 26#endif 27 28_LIBCPP_BEGIN_NAMESPACE_STD 29 30class _LIBCPP_TYPE_VIS mutex 31{ 32 pthread_mutex_t __m_; 33 34public: 35 _LIBCPP_INLINE_VISIBILITY 36#ifndef _LIBCPP_HAS_NO_CONSTEXPR 37 constexpr mutex() _NOEXCEPT : __m_(PTHREAD_MUTEX_INITIALIZER) {} 38#else 39 mutex() _NOEXCEPT {__m_ = (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER;} 40#endif 41 ~mutex(); 42 43private: 44 mutex(const mutex&);// = delete; 45 mutex& operator=(const mutex&);// = delete; 46 47public: 48 void lock(); 49 bool try_lock() _NOEXCEPT; 50 void unlock() _NOEXCEPT; 51 52 typedef pthread_mutex_t* native_handle_type; 53 _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__m_;} 54}; 55 56struct _LIBCPP_TYPE_VIS defer_lock_t {}; 57struct _LIBCPP_TYPE_VIS try_to_lock_t {}; 58struct _LIBCPP_TYPE_VIS adopt_lock_t {}; 59 60#if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_MUTEX) 61 62extern const defer_lock_t defer_lock; 63extern const try_to_lock_t try_to_lock; 64extern const adopt_lock_t adopt_lock; 65 66#else 67 68constexpr defer_lock_t defer_lock = defer_lock_t(); 69constexpr try_to_lock_t try_to_lock = try_to_lock_t(); 70constexpr adopt_lock_t adopt_lock = adopt_lock_t(); 71 72#endif 73 74template <class _Mutex> 75class _LIBCPP_TYPE_VIS_ONLY lock_guard 76{ 77public: 78 typedef _Mutex mutex_type; 79 80private: 81 mutex_type& __m_; 82public: 83 84 _LIBCPP_INLINE_VISIBILITY 85 explicit lock_guard(mutex_type& __m) 86 : __m_(__m) {__m_.lock();} 87 _LIBCPP_INLINE_VISIBILITY 88 lock_guard(mutex_type& __m, adopt_lock_t) 89 : __m_(__m) {} 90 _LIBCPP_INLINE_VISIBILITY 91 ~lock_guard() {__m_.unlock();} 92 93private: 94 lock_guard(lock_guard const&);// = delete; 95 lock_guard& operator=(lock_guard const&);// = delete; 96}; 97 98template <class _Mutex> 99class _LIBCPP_TYPE_VIS_ONLY unique_lock 100{ 101public: 102 typedef _Mutex mutex_type; 103 104private: 105 mutex_type* __m_; 106 bool __owns_; 107 108public: 109 _LIBCPP_INLINE_VISIBILITY 110 unique_lock() _NOEXCEPT : __m_(nullptr), __owns_(false) {} 111 _LIBCPP_INLINE_VISIBILITY 112 explicit unique_lock(mutex_type& __m) 113 : __m_(&__m), __owns_(true) {__m_->lock();} 114 _LIBCPP_INLINE_VISIBILITY 115 unique_lock(mutex_type& __m, defer_lock_t) _NOEXCEPT 116 : __m_(&__m), __owns_(false) {} 117 _LIBCPP_INLINE_VISIBILITY 118 unique_lock(mutex_type& __m, try_to_lock_t) 119 : __m_(&__m), __owns_(__m.try_lock()) {} 120 _LIBCPP_INLINE_VISIBILITY 121 unique_lock(mutex_type& __m, adopt_lock_t) 122 : __m_(&__m), __owns_(true) {} 123 template <class _Clock, class _Duration> 124 _LIBCPP_INLINE_VISIBILITY 125 unique_lock(mutex_type& __m, const chrono::time_point<_Clock, _Duration>& __t) 126 : __m_(&__m), __owns_(__m.try_lock_until(__t)) {} 127 template <class _Rep, class _Period> 128 _LIBCPP_INLINE_VISIBILITY 129 unique_lock(mutex_type& __m, const chrono::duration<_Rep, _Period>& __d) 130 : __m_(&__m), __owns_(__m.try_lock_for(__d)) {} 131 _LIBCPP_INLINE_VISIBILITY 132 ~unique_lock() 133 { 134 if (__owns_) 135 __m_->unlock(); 136 } 137 138private: 139 unique_lock(unique_lock const&); // = delete; 140 unique_lock& operator=(unique_lock const&); // = delete; 141 142public: 143#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 144 _LIBCPP_INLINE_VISIBILITY 145 unique_lock(unique_lock&& __u) _NOEXCEPT 146 : __m_(__u.__m_), __owns_(__u.__owns_) 147 {__u.__m_ = nullptr; __u.__owns_ = false;} 148 _LIBCPP_INLINE_VISIBILITY 149 unique_lock& operator=(unique_lock&& __u) _NOEXCEPT 150 { 151 if (__owns_) 152 __m_->unlock(); 153 __m_ = __u.__m_; 154 __owns_ = __u.__owns_; 155 __u.__m_ = nullptr; 156 __u.__owns_ = false; 157 return *this; 158 } 159 160#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 161 162 void lock(); 163 bool try_lock(); 164 165 template <class _Rep, class _Period> 166 bool try_lock_for(const chrono::duration<_Rep, _Period>& __d); 167 template <class _Clock, class _Duration> 168 bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t); 169 170 void unlock(); 171 172 _LIBCPP_INLINE_VISIBILITY 173 void swap(unique_lock& __u) _NOEXCEPT 174 { 175 _VSTD::swap(__m_, __u.__m_); 176 _VSTD::swap(__owns_, __u.__owns_); 177 } 178 _LIBCPP_INLINE_VISIBILITY 179 mutex_type* release() _NOEXCEPT 180 { 181 mutex_type* __m = __m_; 182 __m_ = nullptr; 183 __owns_ = false; 184 return __m; 185 } 186 187 _LIBCPP_INLINE_VISIBILITY 188 bool owns_lock() const _NOEXCEPT {return __owns_;} 189 _LIBCPP_INLINE_VISIBILITY 190 _LIBCPP_EXPLICIT 191 operator bool () const _NOEXCEPT {return __owns_;} 192 _LIBCPP_INLINE_VISIBILITY 193 mutex_type* mutex() const _NOEXCEPT {return __m_;} 194}; 195 196template <class _Mutex> 197void 198unique_lock<_Mutex>::lock() 199{ 200 if (__m_ == nullptr) 201 __throw_system_error(EPERM, "unique_lock::lock: references null mutex"); 202 if (__owns_) 203 __throw_system_error(EDEADLK, "unique_lock::lock: already locked"); 204 __m_->lock(); 205 __owns_ = true; 206} 207 208template <class _Mutex> 209bool 210unique_lock<_Mutex>::try_lock() 211{ 212 if (__m_ == nullptr) 213 __throw_system_error(EPERM, "unique_lock::try_lock: references null mutex"); 214 if (__owns_) 215 __throw_system_error(EDEADLK, "unique_lock::try_lock: already locked"); 216 __owns_ = __m_->try_lock(); 217 return __owns_; 218} 219 220template <class _Mutex> 221template <class _Rep, class _Period> 222bool 223unique_lock<_Mutex>::try_lock_for(const chrono::duration<_Rep, _Period>& __d) 224{ 225 if (__m_ == nullptr) 226 __throw_system_error(EPERM, "unique_lock::try_lock_for: references null mutex"); 227 if (__owns_) 228 __throw_system_error(EDEADLK, "unique_lock::try_lock_for: already locked"); 229 __owns_ = __m_->try_lock_for(__d); 230 return __owns_; 231} 232 233template <class _Mutex> 234template <class _Clock, class _Duration> 235bool 236unique_lock<_Mutex>::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t) 237{ 238 if (__m_ == nullptr) 239 __throw_system_error(EPERM, "unique_lock::try_lock_until: references null mutex"); 240 if (__owns_) 241 __throw_system_error(EDEADLK, "unique_lock::try_lock_until: already locked"); 242 __owns_ = __m_->try_lock_until(__t); 243 return __owns_; 244} 245 246template <class _Mutex> 247void 248unique_lock<_Mutex>::unlock() 249{ 250 if (!__owns_) 251 __throw_system_error(EPERM, "unique_lock::unlock: not locked"); 252 __m_->unlock(); 253 __owns_ = false; 254} 255 256template <class _Mutex> 257inline _LIBCPP_INLINE_VISIBILITY 258void 259swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>& __y) _NOEXCEPT 260 {__x.swap(__y);} 261 262struct _LIBCPP_TYPE_VIS cv_status 263{ 264 enum __lx { 265 no_timeout, 266 timeout 267 }; 268 269 __lx __v_; 270 271 _LIBCPP_INLINE_VISIBILITY cv_status(__lx __v) : __v_(__v) {} 272 _LIBCPP_INLINE_VISIBILITY operator int() const {return __v_;} 273 274}; 275 276class _LIBCPP_TYPE_VIS condition_variable 277{ 278 pthread_cond_t __cv_; 279public: 280 _LIBCPP_INLINE_VISIBILITY 281#ifndef _LIBCPP_HAS_NO_CONSTEXPR 282 constexpr condition_variable() : __cv_(PTHREAD_COND_INITIALIZER) {} 283#else 284 condition_variable() {__cv_ = (pthread_cond_t)PTHREAD_COND_INITIALIZER;} 285#endif 286 ~condition_variable(); 287 288private: 289 condition_variable(const condition_variable&); // = delete; 290 condition_variable& operator=(const condition_variable&); // = delete; 291 292public: 293 void notify_one() _NOEXCEPT; 294 void notify_all() _NOEXCEPT; 295 296 void wait(unique_lock<mutex>& __lk); 297 template <class _Predicate> 298 void wait(unique_lock<mutex>& __lk, _Predicate __pred); 299 300 template <class _Clock, class _Duration> 301 cv_status 302 wait_until(unique_lock<mutex>& __lk, 303 const chrono::time_point<_Clock, _Duration>& __t); 304 305 template <class _Clock, class _Duration, class _Predicate> 306 bool 307 wait_until(unique_lock<mutex>& __lk, 308 const chrono::time_point<_Clock, _Duration>& __t, 309 _Predicate __pred); 310 311 template <class _Rep, class _Period> 312 cv_status 313 wait_for(unique_lock<mutex>& __lk, 314 const chrono::duration<_Rep, _Period>& __d); 315 316 template <class _Rep, class _Period, class _Predicate> 317 bool 318 wait_for(unique_lock<mutex>& __lk, 319 const chrono::duration<_Rep, _Period>& __d, 320 _Predicate __pred); 321 322 typedef pthread_cond_t* native_handle_type; 323 _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__cv_;} 324 325private: 326 void __do_timed_wait(unique_lock<mutex>& __lk, 327 chrono::time_point<chrono::system_clock, chrono::nanoseconds>); 328}; 329 330template <class _To, class _Rep, class _Period> 331inline _LIBCPP_INLINE_VISIBILITY 332typename enable_if 333< 334 chrono::__is_duration<_To>::value, 335 _To 336>::type 337__ceil(chrono::duration<_Rep, _Period> __d) 338{ 339 using namespace chrono; 340 _To __r = duration_cast<_To>(__d); 341 if (__r < __d) 342 ++__r; 343 return __r; 344} 345 346template <class _Predicate> 347void 348condition_variable::wait(unique_lock<mutex>& __lk, _Predicate __pred) 349{ 350 while (!__pred()) 351 wait(__lk); 352} 353 354template <class _Clock, class _Duration> 355cv_status 356condition_variable::wait_until(unique_lock<mutex>& __lk, 357 const chrono::time_point<_Clock, _Duration>& __t) 358{ 359 using namespace chrono; 360 wait_for(__lk, __t - _Clock::now()); 361 return _Clock::now() < __t ? cv_status::no_timeout : cv_status::timeout; 362} 363 364template <class _Clock, class _Duration, class _Predicate> 365bool 366condition_variable::wait_until(unique_lock<mutex>& __lk, 367 const chrono::time_point<_Clock, _Duration>& __t, 368 _Predicate __pred) 369{ 370 while (!__pred()) 371 { 372 if (wait_until(__lk, __t) == cv_status::timeout) 373 return __pred(); 374 } 375 return true; 376} 377 378template <class _Rep, class _Period> 379cv_status 380condition_variable::wait_for(unique_lock<mutex>& __lk, 381 const chrono::duration<_Rep, _Period>& __d) 382{ 383 using namespace chrono; 384 if (__d <= __d.zero()) 385 return cv_status::timeout; 386 typedef time_point<system_clock, duration<long double, nano> > __sys_tpf; 387 typedef time_point<system_clock, nanoseconds> __sys_tpi; 388 __sys_tpf _Max = __sys_tpi::max(); 389 system_clock::time_point __s_now = system_clock::now(); 390 steady_clock::time_point __c_now = steady_clock::now(); 391 if (_Max - __d > __s_now) 392 __do_timed_wait(__lk, __s_now + __ceil<nanoseconds>(__d)); 393 else 394 __do_timed_wait(__lk, __sys_tpi::max()); 395 return steady_clock::now() - __c_now < __d ? cv_status::no_timeout : 396 cv_status::timeout; 397} 398 399template <class _Rep, class _Period, class _Predicate> 400inline _LIBCPP_INLINE_VISIBILITY 401bool 402condition_variable::wait_for(unique_lock<mutex>& __lk, 403 const chrono::duration<_Rep, _Period>& __d, 404 _Predicate __pred) 405{ 406 return wait_until(__lk, chrono::steady_clock::now() + __d, 407 _VSTD::move(__pred)); 408} 409 410_LIBCPP_END_NAMESPACE_STD 411 412#endif // _LIBCPP___MUTEX_BASE 413