Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 1 | // -*- C++ -*- |
| 2 | //===------------------------ shared_mutex --------------------------------===// |
| 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_SHARED_MUTEX |
| 12 | #define _LIBCPP_SHARED_MUTEX |
| 13 | |
| 14 | /* |
| 15 | shared_mutex synopsis |
| 16 | |
| 17 | // C++1y |
| 18 | |
| 19 | namespace std |
| 20 | { |
| 21 | |
Marshall Clow | abadb45 | 2015-06-30 14:04:14 +0000 | [diff] [blame] | 22 | class shared_mutex // C++17 |
| 23 | { |
| 24 | public: |
| 25 | shared_mutex(); |
| 26 | ~shared_mutex(); |
| 27 | |
| 28 | shared_mutex(const shared_mutex&) = delete; |
| 29 | shared_mutex& operator=(const shared_mutex&) = delete; |
| 30 | |
| 31 | // Exclusive ownership |
| 32 | void lock(); // blocking |
| 33 | bool try_lock(); |
| 34 | void unlock(); |
| 35 | |
| 36 | // Shared ownership |
| 37 | void lock_shared(); // blocking |
| 38 | bool try_lock_shared(); |
| 39 | void unlock_shared(); |
| 40 | |
| 41 | typedef implementation-defined native_handle_type; // See 30.2.3 |
| 42 | native_handle_type native_handle(); // See 30.2.3 |
| 43 | }; |
| 44 | |
David Majnemer | f9f95be | 2014-03-17 20:19:44 +0000 | [diff] [blame] | 45 | class shared_timed_mutex |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 46 | { |
| 47 | public: |
David Majnemer | f9f95be | 2014-03-17 20:19:44 +0000 | [diff] [blame] | 48 | shared_timed_mutex(); |
| 49 | ~shared_timed_mutex(); |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 50 | |
David Majnemer | f9f95be | 2014-03-17 20:19:44 +0000 | [diff] [blame] | 51 | shared_timed_mutex(const shared_timed_mutex&) = delete; |
| 52 | shared_timed_mutex& operator=(const shared_timed_mutex&) = delete; |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 53 | |
| 54 | // Exclusive ownership |
| 55 | void lock(); // blocking |
| 56 | bool try_lock(); |
| 57 | template <class Rep, class Period> |
| 58 | bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); |
| 59 | template <class Clock, class Duration> |
| 60 | bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); |
| 61 | void unlock(); |
| 62 | |
| 63 | // Shared ownership |
| 64 | void lock_shared(); // blocking |
| 65 | bool try_lock_shared(); |
| 66 | template <class Rep, class Period> |
| 67 | bool |
| 68 | try_lock_shared_for(const chrono::duration<Rep, Period>& rel_time); |
| 69 | template <class Clock, class Duration> |
| 70 | bool |
| 71 | try_lock_shared_until(const chrono::time_point<Clock, Duration>& abs_time); |
| 72 | void unlock_shared(); |
| 73 | }; |
| 74 | |
| 75 | template <class Mutex> |
| 76 | class shared_lock |
| 77 | { |
| 78 | public: |
| 79 | typedef Mutex mutex_type; |
| 80 | |
| 81 | // Shared locking |
| 82 | shared_lock() noexcept; |
| 83 | explicit shared_lock(mutex_type& m); // blocking |
| 84 | shared_lock(mutex_type& m, defer_lock_t) noexcept; |
| 85 | shared_lock(mutex_type& m, try_to_lock_t); |
| 86 | shared_lock(mutex_type& m, adopt_lock_t); |
| 87 | template <class Clock, class Duration> |
| 88 | shared_lock(mutex_type& m, |
| 89 | const chrono::time_point<Clock, Duration>& abs_time); |
| 90 | template <class Rep, class Period> |
| 91 | shared_lock(mutex_type& m, |
| 92 | const chrono::duration<Rep, Period>& rel_time); |
| 93 | ~shared_lock(); |
| 94 | |
| 95 | shared_lock(shared_lock const&) = delete; |
| 96 | shared_lock& operator=(shared_lock const&) = delete; |
| 97 | |
| 98 | shared_lock(shared_lock&& u) noexcept; |
| 99 | shared_lock& operator=(shared_lock&& u) noexcept; |
| 100 | |
| 101 | void lock(); // blocking |
| 102 | bool try_lock(); |
| 103 | template <class Rep, class Period> |
| 104 | bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); |
| 105 | template <class Clock, class Duration> |
| 106 | bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); |
| 107 | void unlock(); |
| 108 | |
| 109 | // Setters |
| 110 | void swap(shared_lock& u) noexcept; |
| 111 | mutex_type* release() noexcept; |
| 112 | |
| 113 | // Getters |
| 114 | bool owns_lock() const noexcept; |
| 115 | explicit operator bool () const noexcept; |
| 116 | mutex_type* mutex() const noexcept; |
| 117 | }; |
| 118 | |
| 119 | template <class Mutex> |
| 120 | void swap(shared_lock<Mutex>& x, shared_lock<Mutex>& y) noexcept; |
| 121 | |
| 122 | } // std |
| 123 | |
| 124 | */ |
| 125 | |
| 126 | #include <__config> |
| 127 | |
| 128 | #if _LIBCPP_STD_VER > 11 || defined(_LIBCPP_BUILDING_SHARED_MUTEX) |
| 129 | |
| 130 | #include <__mutex_base> |
| 131 | |
| 132 | #include <__undef_min_max> |
| 133 | |
| 134 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 135 | #pragma GCC system_header |
| 136 | #endif |
| 137 | |
Jonathan Roelofs | 8d86b2e | 2014-09-05 19:45:05 +0000 | [diff] [blame] | 138 | #ifdef _LIBCPP_HAS_NO_THREADS |
| 139 | #error <shared_mutex> is not supported on this single threaded system |
| 140 | #else // !_LIBCPP_HAS_NO_THREADS |
| 141 | |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 142 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 143 | |
Marshall Clow | abadb45 | 2015-06-30 14:04:14 +0000 | [diff] [blame] | 144 | struct _LIBCPP_TYPE_VIS __shared_mutex_base |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 145 | { |
| 146 | mutex __mut_; |
| 147 | condition_variable __gate1_; |
| 148 | condition_variable __gate2_; |
| 149 | unsigned __state_; |
| 150 | |
| 151 | static const unsigned __write_entered_ = 1U << (sizeof(unsigned)*__CHAR_BIT__ - 1); |
| 152 | static const unsigned __n_readers_ = ~__write_entered_; |
Marshall Clow | abadb45 | 2015-06-30 14:04:14 +0000 | [diff] [blame] | 153 | |
| 154 | __shared_mutex_base(); |
| 155 | _LIBCPP_INLINE_VISIBILITY ~__shared_mutex_base() = default; |
| 156 | |
| 157 | __shared_mutex_base(const __shared_mutex_base&) = delete; |
| 158 | __shared_mutex_base& operator=(const __shared_mutex_base&) = delete; |
| 159 | |
| 160 | // Exclusive ownership |
| 161 | void lock(); // blocking |
| 162 | bool try_lock(); |
| 163 | void unlock(); |
| 164 | |
| 165 | // Shared ownership |
| 166 | void lock_shared(); // blocking |
| 167 | bool try_lock_shared(); |
| 168 | void unlock_shared(); |
| 169 | |
| 170 | // typedef implementation-defined native_handle_type; // See 30.2.3 |
| 171 | // native_handle_type native_handle(); // See 30.2.3 |
| 172 | }; |
| 173 | |
| 174 | |
| 175 | #if _LIBCPP_STD_VER > 14 |
| 176 | class _LIBCPP_TYPE_VIS shared_mutex |
| 177 | { |
| 178 | __shared_mutex_base __base; |
| 179 | public: |
| 180 | shared_mutex() : __base() {} |
| 181 | _LIBCPP_INLINE_VISIBILITY ~shared_mutex() = default; |
| 182 | |
| 183 | shared_mutex(const shared_mutex&) = delete; |
| 184 | shared_mutex& operator=(const shared_mutex&) = delete; |
| 185 | |
| 186 | // Exclusive ownership |
| 187 | _LIBCPP_INLINE_VISIBILITY void lock() { return __base.lock(); } |
| 188 | _LIBCPP_INLINE_VISIBILITY bool try_lock() { return __base.try_lock(); } |
| 189 | _LIBCPP_INLINE_VISIBILITY void unlock() { return __base.unlock(); } |
| 190 | |
| 191 | // Shared ownership |
| 192 | _LIBCPP_INLINE_VISIBILITY void lock_shared() { return __base.lock_shared(); } |
| 193 | _LIBCPP_INLINE_VISIBILITY bool try_lock_shared() { return __base.try_lock_shared(); } |
| 194 | _LIBCPP_INLINE_VISIBILITY void unlock_shared() { return __base.unlock_shared(); } |
| 195 | |
| 196 | // typedef __shared_mutex_base::native_handle_type native_handle_type; |
| 197 | // _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() { return __base::unlock_shared(); } |
| 198 | }; |
| 199 | #endif |
| 200 | |
| 201 | |
| 202 | class _LIBCPP_TYPE_VIS shared_timed_mutex |
| 203 | { |
| 204 | __shared_mutex_base __base; |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 205 | public: |
David Majnemer | f9f95be | 2014-03-17 20:19:44 +0000 | [diff] [blame] | 206 | shared_timed_mutex(); |
| 207 | _LIBCPP_INLINE_VISIBILITY ~shared_timed_mutex() = default; |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 208 | |
David Majnemer | f9f95be | 2014-03-17 20:19:44 +0000 | [diff] [blame] | 209 | shared_timed_mutex(const shared_timed_mutex&) = delete; |
| 210 | shared_timed_mutex& operator=(const shared_timed_mutex&) = delete; |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 211 | |
| 212 | // Exclusive ownership |
| 213 | void lock(); |
| 214 | bool try_lock(); |
| 215 | template <class _Rep, class _Period> |
| 216 | _LIBCPP_INLINE_VISIBILITY |
| 217 | bool |
| 218 | try_lock_for(const chrono::duration<_Rep, _Period>& __rel_time) |
| 219 | { |
| 220 | return try_lock_until(chrono::steady_clock::now() + __rel_time); |
| 221 | } |
| 222 | template <class _Clock, class _Duration> |
| 223 | bool |
| 224 | try_lock_until(const chrono::time_point<_Clock, _Duration>& __abs_time); |
| 225 | void unlock(); |
| 226 | |
| 227 | // Shared ownership |
| 228 | void lock_shared(); |
| 229 | bool try_lock_shared(); |
| 230 | template <class _Rep, class _Period> |
| 231 | _LIBCPP_INLINE_VISIBILITY |
| 232 | bool |
| 233 | try_lock_shared_for(const chrono::duration<_Rep, _Period>& __rel_time) |
| 234 | { |
| 235 | return try_lock_shared_until(chrono::steady_clock::now() + __rel_time); |
| 236 | } |
| 237 | template <class _Clock, class _Duration> |
| 238 | bool |
| 239 | try_lock_shared_until(const chrono::time_point<_Clock, _Duration>& __abs_time); |
| 240 | void unlock_shared(); |
| 241 | }; |
| 242 | |
| 243 | template <class _Clock, class _Duration> |
| 244 | bool |
David Majnemer | f9f95be | 2014-03-17 20:19:44 +0000 | [diff] [blame] | 245 | shared_timed_mutex::try_lock_until( |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 246 | const chrono::time_point<_Clock, _Duration>& __abs_time) |
| 247 | { |
Marshall Clow | abadb45 | 2015-06-30 14:04:14 +0000 | [diff] [blame] | 248 | unique_lock<mutex> __lk(__base.__mut_); |
| 249 | if (__base.__state_ & __base.__write_entered_) |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 250 | { |
| 251 | while (true) |
| 252 | { |
Marshall Clow | abadb45 | 2015-06-30 14:04:14 +0000 | [diff] [blame] | 253 | cv_status __status = __base.__gate1_.wait_until(__lk, __abs_time); |
| 254 | if ((__base.__state_ & __base.__write_entered_) == 0) |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 255 | break; |
| 256 | if (__status == cv_status::timeout) |
| 257 | return false; |
| 258 | } |
| 259 | } |
Marshall Clow | abadb45 | 2015-06-30 14:04:14 +0000 | [diff] [blame] | 260 | __base.__state_ |= __base.__write_entered_; |
| 261 | if (__base.__state_ & __base.__n_readers_) |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 262 | { |
| 263 | while (true) |
| 264 | { |
Marshall Clow | abadb45 | 2015-06-30 14:04:14 +0000 | [diff] [blame] | 265 | cv_status __status = __base.__gate2_.wait_until(__lk, __abs_time); |
| 266 | if ((__base.__state_ & __base.__n_readers_) == 0) |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 267 | break; |
| 268 | if (__status == cv_status::timeout) |
| 269 | { |
Marshall Clow | abadb45 | 2015-06-30 14:04:14 +0000 | [diff] [blame] | 270 | __base.__state_ &= ~__base.__write_entered_; |
| 271 | __base.__gate1_.notify_all(); |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 272 | return false; |
| 273 | } |
| 274 | } |
| 275 | } |
| 276 | return true; |
| 277 | } |
| 278 | |
| 279 | template <class _Clock, class _Duration> |
| 280 | bool |
David Majnemer | f9f95be | 2014-03-17 20:19:44 +0000 | [diff] [blame] | 281 | shared_timed_mutex::try_lock_shared_until( |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 282 | const chrono::time_point<_Clock, _Duration>& __abs_time) |
| 283 | { |
Marshall Clow | abadb45 | 2015-06-30 14:04:14 +0000 | [diff] [blame] | 284 | unique_lock<mutex> __lk(__base.__mut_); |
| 285 | if ((__base.__state_ & __base.__write_entered_) || (__base.__state_ & __base.__n_readers_) == __base.__n_readers_) |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 286 | { |
| 287 | while (true) |
| 288 | { |
Marshall Clow | abadb45 | 2015-06-30 14:04:14 +0000 | [diff] [blame] | 289 | cv_status status = __base.__gate1_.wait_until(__lk, __abs_time); |
| 290 | if ((__base.__state_ & __base.__write_entered_) == 0 && |
| 291 | (__base.__state_ & __base.__n_readers_) < __base.__n_readers_) |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 292 | break; |
| 293 | if (status == cv_status::timeout) |
| 294 | return false; |
| 295 | } |
| 296 | } |
Marshall Clow | abadb45 | 2015-06-30 14:04:14 +0000 | [diff] [blame] | 297 | unsigned __num_readers = (__base.__state_ & __base.__n_readers_) + 1; |
| 298 | __base.__state_ &= ~__base.__n_readers_; |
| 299 | __base.__state_ |= __num_readers; |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 300 | return true; |
| 301 | } |
| 302 | |
| 303 | template <class _Mutex> |
| 304 | class shared_lock |
| 305 | { |
| 306 | public: |
| 307 | typedef _Mutex mutex_type; |
| 308 | |
| 309 | private: |
| 310 | mutex_type* __m_; |
| 311 | bool __owns_; |
| 312 | |
| 313 | public: |
| 314 | _LIBCPP_INLINE_VISIBILITY |
Marshall Clow | 861f1e9 | 2014-08-25 14:53:16 +0000 | [diff] [blame] | 315 | shared_lock() _NOEXCEPT |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 316 | : __m_(nullptr), |
| 317 | __owns_(false) |
| 318 | {} |
| 319 | |
| 320 | _LIBCPP_INLINE_VISIBILITY |
| 321 | explicit shared_lock(mutex_type& __m) |
Dan Albert | 1d4a1ed | 2016-05-25 22:36:09 -0700 | [diff] [blame^] | 322 | : __m_(&__m), |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 323 | __owns_(true) |
| 324 | {__m_->lock_shared();} |
| 325 | |
| 326 | _LIBCPP_INLINE_VISIBILITY |
Marshall Clow | 861f1e9 | 2014-08-25 14:53:16 +0000 | [diff] [blame] | 327 | shared_lock(mutex_type& __m, defer_lock_t) _NOEXCEPT |
Dan Albert | 1d4a1ed | 2016-05-25 22:36:09 -0700 | [diff] [blame^] | 328 | : __m_(&__m), |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 329 | __owns_(false) |
| 330 | {} |
| 331 | |
| 332 | _LIBCPP_INLINE_VISIBILITY |
| 333 | shared_lock(mutex_type& __m, try_to_lock_t) |
Dan Albert | 1d4a1ed | 2016-05-25 22:36:09 -0700 | [diff] [blame^] | 334 | : __m_(&__m), |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 335 | __owns_(__m.try_lock_shared()) |
| 336 | {} |
| 337 | |
| 338 | _LIBCPP_INLINE_VISIBILITY |
| 339 | shared_lock(mutex_type& __m, adopt_lock_t) |
Dan Albert | 1d4a1ed | 2016-05-25 22:36:09 -0700 | [diff] [blame^] | 340 | : __m_(&__m), |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 341 | __owns_(true) |
| 342 | {} |
| 343 | |
| 344 | template <class _Clock, class _Duration> |
| 345 | _LIBCPP_INLINE_VISIBILITY |
| 346 | shared_lock(mutex_type& __m, |
| 347 | const chrono::time_point<_Clock, _Duration>& __abs_time) |
Dan Albert | 1d4a1ed | 2016-05-25 22:36:09 -0700 | [diff] [blame^] | 348 | : __m_(&__m), |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 349 | __owns_(__m.try_lock_shared_until(__abs_time)) |
| 350 | {} |
| 351 | |
| 352 | template <class _Rep, class _Period> |
| 353 | _LIBCPP_INLINE_VISIBILITY |
| 354 | shared_lock(mutex_type& __m, |
| 355 | const chrono::duration<_Rep, _Period>& __rel_time) |
Dan Albert | 1d4a1ed | 2016-05-25 22:36:09 -0700 | [diff] [blame^] | 356 | : __m_(&__m), |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 357 | __owns_(__m.try_lock_shared_for(__rel_time)) |
| 358 | {} |
| 359 | |
| 360 | _LIBCPP_INLINE_VISIBILITY |
| 361 | ~shared_lock() |
| 362 | { |
| 363 | if (__owns_) |
| 364 | __m_->unlock_shared(); |
| 365 | } |
| 366 | |
| 367 | shared_lock(shared_lock const&) = delete; |
| 368 | shared_lock& operator=(shared_lock const&) = delete; |
| 369 | |
| 370 | _LIBCPP_INLINE_VISIBILITY |
Marshall Clow | 861f1e9 | 2014-08-25 14:53:16 +0000 | [diff] [blame] | 371 | shared_lock(shared_lock&& __u) _NOEXCEPT |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 372 | : __m_(__u.__m_), |
| 373 | __owns_(__u.__owns_) |
| 374 | { |
| 375 | __u.__m_ = nullptr; |
| 376 | __u.__owns_ = false; |
| 377 | } |
| 378 | |
| 379 | _LIBCPP_INLINE_VISIBILITY |
Marshall Clow | 861f1e9 | 2014-08-25 14:53:16 +0000 | [diff] [blame] | 380 | shared_lock& operator=(shared_lock&& __u) _NOEXCEPT |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 381 | { |
| 382 | if (__owns_) |
| 383 | __m_->unlock_shared(); |
| 384 | __m_ = nullptr; |
| 385 | __owns_ = false; |
| 386 | __m_ = __u.__m_; |
| 387 | __owns_ = __u.__owns_; |
| 388 | __u.__m_ = nullptr; |
| 389 | __u.__owns_ = false; |
| 390 | return *this; |
| 391 | } |
| 392 | |
| 393 | void lock(); |
| 394 | bool try_lock(); |
| 395 | template <class Rep, class Period> |
| 396 | bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); |
| 397 | template <class Clock, class Duration> |
| 398 | bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); |
| 399 | void unlock(); |
| 400 | |
| 401 | // Setters |
| 402 | _LIBCPP_INLINE_VISIBILITY |
Marshall Clow | 861f1e9 | 2014-08-25 14:53:16 +0000 | [diff] [blame] | 403 | void swap(shared_lock& __u) _NOEXCEPT |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 404 | { |
| 405 | _VSTD::swap(__m_, __u.__m_); |
| 406 | _VSTD::swap(__owns_, __u.__owns_); |
| 407 | } |
| 408 | |
| 409 | _LIBCPP_INLINE_VISIBILITY |
Marshall Clow | 861f1e9 | 2014-08-25 14:53:16 +0000 | [diff] [blame] | 410 | mutex_type* release() _NOEXCEPT |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 411 | { |
| 412 | mutex_type* __m = __m_; |
| 413 | __m_ = nullptr; |
| 414 | __owns_ = false; |
| 415 | return __m; |
| 416 | } |
| 417 | |
| 418 | // Getters |
| 419 | _LIBCPP_INLINE_VISIBILITY |
Marshall Clow | 861f1e9 | 2014-08-25 14:53:16 +0000 | [diff] [blame] | 420 | bool owns_lock() const _NOEXCEPT {return __owns_;} |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 421 | |
| 422 | _LIBCPP_INLINE_VISIBILITY |
Marshall Clow | 861f1e9 | 2014-08-25 14:53:16 +0000 | [diff] [blame] | 423 | explicit operator bool () const _NOEXCEPT {return __owns_;} |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 424 | |
| 425 | _LIBCPP_INLINE_VISIBILITY |
Marshall Clow | 861f1e9 | 2014-08-25 14:53:16 +0000 | [diff] [blame] | 426 | mutex_type* mutex() const _NOEXCEPT {return __m_;} |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 427 | }; |
| 428 | |
| 429 | template <class _Mutex> |
| 430 | void |
| 431 | shared_lock<_Mutex>::lock() |
| 432 | { |
| 433 | if (__m_ == nullptr) |
| 434 | __throw_system_error(EPERM, "shared_lock::lock: references null mutex"); |
| 435 | if (__owns_) |
| 436 | __throw_system_error(EDEADLK, "shared_lock::lock: already locked"); |
| 437 | __m_->lock_shared(); |
| 438 | __owns_ = true; |
| 439 | } |
| 440 | |
| 441 | template <class _Mutex> |
| 442 | bool |
| 443 | shared_lock<_Mutex>::try_lock() |
| 444 | { |
| 445 | if (__m_ == nullptr) |
| 446 | __throw_system_error(EPERM, "shared_lock::try_lock: references null mutex"); |
| 447 | if (__owns_) |
| 448 | __throw_system_error(EDEADLK, "shared_lock::try_lock: already locked"); |
| 449 | __owns_ = __m_->try_lock_shared(); |
| 450 | return __owns_; |
| 451 | } |
| 452 | |
| 453 | template <class _Mutex> |
| 454 | template <class _Rep, class _Period> |
| 455 | bool |
| 456 | shared_lock<_Mutex>::try_lock_for(const chrono::duration<_Rep, _Period>& __d) |
| 457 | { |
| 458 | if (__m_ == nullptr) |
| 459 | __throw_system_error(EPERM, "shared_lock::try_lock_for: references null mutex"); |
| 460 | if (__owns_) |
| 461 | __throw_system_error(EDEADLK, "shared_lock::try_lock_for: already locked"); |
| 462 | __owns_ = __m_->try_lock_shared_for(__d); |
| 463 | return __owns_; |
| 464 | } |
| 465 | |
| 466 | template <class _Mutex> |
| 467 | template <class _Clock, class _Duration> |
| 468 | bool |
| 469 | shared_lock<_Mutex>::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t) |
| 470 | { |
| 471 | if (__m_ == nullptr) |
| 472 | __throw_system_error(EPERM, "shared_lock::try_lock_until: references null mutex"); |
| 473 | if (__owns_) |
| 474 | __throw_system_error(EDEADLK, "shared_lock::try_lock_until: already locked"); |
| 475 | __owns_ = __m_->try_lock_shared_until(__t); |
| 476 | return __owns_; |
| 477 | } |
| 478 | |
| 479 | template <class _Mutex> |
| 480 | void |
| 481 | shared_lock<_Mutex>::unlock() |
| 482 | { |
| 483 | if (!__owns_) |
| 484 | __throw_system_error(EPERM, "shared_lock::unlock: not locked"); |
| 485 | __m_->unlock_shared(); |
| 486 | __owns_ = false; |
| 487 | } |
| 488 | |
| 489 | template <class _Mutex> |
| 490 | inline _LIBCPP_INLINE_VISIBILITY |
| 491 | void |
Marshall Clow | 861f1e9 | 2014-08-25 14:53:16 +0000 | [diff] [blame] | 492 | swap(shared_lock<_Mutex>& __x, shared_lock<_Mutex>& __y) _NOEXCEPT |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 493 | {__x.swap(__y);} |
| 494 | |
| 495 | _LIBCPP_END_NAMESPACE_STD |
| 496 | |
Jonathan Roelofs | 8d86b2e | 2014-09-05 19:45:05 +0000 | [diff] [blame] | 497 | #endif // !_LIBCPP_HAS_NO_THREADS |
| 498 | |
Howard Hinnant | ba898e4 | 2013-09-21 01:49:28 +0000 | [diff] [blame] | 499 | #endif // _LIBCPP_STD_VER > 11 |
| 500 | |
| 501 | #endif // _LIBCPP_SHARED_MUTEX |