2 //===--------------------------- mutex ------------------------------------===//
4 // The LLVM Compiler Infrastructure
6 // This file is dual licensed under the MIT and the University of Illinois Open
7 // Source Licenses. See LICENSE.TXT for details.
9 //===----------------------------------------------------------------------===//
23 constexpr mutex() noexcept;
26 mutex(const mutex&) = delete;
27 mutex& operator=(const mutex&) = delete;
33 typedef pthread_mutex_t* native_handle_type;
34 native_handle_type native_handle();
43 recursive_mutex(const recursive_mutex&) = delete;
44 recursive_mutex& operator=(const recursive_mutex&) = delete;
47 bool try_lock() noexcept;
50 typedef pthread_mutex_t* native_handle_type;
51 native_handle_type native_handle();
60 timed_mutex(const timed_mutex&) = delete;
61 timed_mutex& operator=(const timed_mutex&) = delete;
65 template <class Rep, class Period>
66 bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
67 template <class Clock, class Duration>
68 bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
72 class recursive_timed_mutex
75 recursive_timed_mutex();
76 ~recursive_timed_mutex();
78 recursive_timed_mutex(const recursive_timed_mutex&) = delete;
79 recursive_timed_mutex& operator=(const recursive_timed_mutex&) = delete;
82 bool try_lock() noexcept;
83 template <class Rep, class Period>
84 bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
85 template <class Clock, class Duration>
86 bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
90 struct defer_lock_t {};
91 struct try_to_lock_t {};
92 struct adopt_lock_t {};
94 constexpr defer_lock_t defer_lock{};
95 constexpr try_to_lock_t try_to_lock{};
96 constexpr adopt_lock_t adopt_lock{};
98 template <class Mutex>
102 typedef Mutex mutex_type;
104 explicit lock_guard(mutex_type& m);
105 lock_guard(mutex_type& m, adopt_lock_t);
108 lock_guard(lock_guard const&) = delete;
109 lock_guard& operator=(lock_guard const&) = delete;
112 template <class Mutex>
116 typedef Mutex mutex_type;
117 unique_lock() noexcept;
118 explicit unique_lock(mutex_type& m);
119 unique_lock(mutex_type& m, defer_lock_t) noexcept;
120 unique_lock(mutex_type& m, try_to_lock_t);
121 unique_lock(mutex_type& m, adopt_lock_t);
122 template <class Clock, class Duration>
123 unique_lock(mutex_type& m, const chrono::time_point<Clock, Duration>& abs_time);
124 template <class Rep, class Period>
125 unique_lock(mutex_type& m, const chrono::duration<Rep, Period>& rel_time);
128 unique_lock(unique_lock const&) = delete;
129 unique_lock& operator=(unique_lock const&) = delete;
131 unique_lock(unique_lock&& u) noexcept;
132 unique_lock& operator=(unique_lock&& u) noexcept;
137 template <class Rep, class Period>
138 bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
139 template <class Clock, class Duration>
140 bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
144 void swap(unique_lock& u) noexcept;
145 mutex_type* release() noexcept;
147 bool owns_lock() const noexcept;
148 explicit operator bool () const noexcept;
149 mutex_type* mutex() const noexcept;
152 template <class Mutex>
153 void swap(unique_lock<Mutex>& x, unique_lock<Mutex>& y) noexcept;
155 template <class L1, class L2, class... L3>
156 int try_lock(L1&, L2&, L3&...);
157 template <class L1, class L2, class... L3>
158 void lock(L1&, L2&, L3&...);
162 constexpr once_flag() noexcept;
164 once_flag(const once_flag&) = delete;
165 once_flag& operator=(const once_flag&) = delete;
168 template<class Callable, class ...Args>
169 void call_once(once_flag& flag, Callable&& func, Args&&... args);
176 #include <__mutex_base>
177 #include <functional>
178 #ifndef _LIBCPP_HAS_NO_VARIADICS
182 #include <__undef_min_max>
184 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
185 #pragma GCC system_header
188 _LIBCPP_BEGIN_NAMESPACE_STD
190 class _LIBCPP_TYPE_VIS recursive_mutex
192 pthread_mutex_t __m_;
199 recursive_mutex(const recursive_mutex&); // = delete;
200 recursive_mutex& operator=(const recursive_mutex&); // = delete;
204 bool try_lock() _NOEXCEPT;
205 void unlock() _NOEXCEPT;
207 typedef pthread_mutex_t* native_handle_type;
208 _LIBCPP_INLINE_VISIBILITY
209 native_handle_type native_handle() {return &__m_;}
212 class _LIBCPP_TYPE_VIS timed_mutex
215 condition_variable __cv_;
222 timed_mutex(const timed_mutex&); // = delete;
223 timed_mutex& operator=(const timed_mutex&); // = delete;
227 bool try_lock() _NOEXCEPT;
228 template <class _Rep, class _Period>
229 _LIBCPP_INLINE_VISIBILITY
230 bool try_lock_for(const chrono::duration<_Rep, _Period>& __d)
231 {return try_lock_until(chrono::steady_clock::now() + __d);}
232 template <class _Clock, class _Duration>
233 bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t);
234 void unlock() _NOEXCEPT;
237 template <class _Clock, class _Duration>
239 timed_mutex::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t)
241 using namespace chrono;
242 unique_lock<mutex> __lk(__m_);
243 bool no_timeout = _Clock::now() < __t;
244 while (no_timeout && __locked_)
245 no_timeout = __cv_.wait_until(__lk, __t) == cv_status::no_timeout;
254 class _LIBCPP_TYPE_VIS recursive_timed_mutex
257 condition_variable __cv_;
261 recursive_timed_mutex();
262 ~recursive_timed_mutex();
265 recursive_timed_mutex(const recursive_timed_mutex&); // = delete;
266 recursive_timed_mutex& operator=(const recursive_timed_mutex&); // = delete;
270 bool try_lock() _NOEXCEPT;
271 template <class _Rep, class _Period>
272 _LIBCPP_INLINE_VISIBILITY
273 bool try_lock_for(const chrono::duration<_Rep, _Period>& __d)
274 {return try_lock_until(chrono::steady_clock::now() + __d);}
275 template <class _Clock, class _Duration>
276 bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t);
277 void unlock() _NOEXCEPT;
280 template <class _Clock, class _Duration>
282 recursive_timed_mutex::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t)
284 using namespace chrono;
285 pthread_t __id = pthread_self();
286 unique_lock<mutex> lk(__m_);
287 if (pthread_equal(__id, __id_))
289 if (__count_ == numeric_limits<size_t>::max())
294 bool no_timeout = _Clock::now() < __t;
295 while (no_timeout && __count_ != 0)
296 no_timeout = __cv_.wait_until(lk, __t) == cv_status::no_timeout;
306 template <class _L0, class _L1>
308 try_lock(_L0& __l0, _L1& __l1)
310 unique_lock<_L0> __u0(__l0, try_to_lock);
311 if (__u0.owns_lock())
324 #ifndef _LIBCPP_HAS_NO_VARIADICS
326 template <class _L0, class _L1, class _L2, class... _L3>
328 try_lock(_L0& __l0, _L1& __l1, _L2& __l2, _L3&... __l3)
331 unique_lock<_L0> __u0(__l0, try_to_lock);
332 if (__u0.owns_lock())
334 __r = try_lock(__l1, __l2, __l3...);
343 #endif // _LIBCPP_HAS_NO_VARIADICS
345 template <class _L0, class _L1>
347 lock(_L0& __l0, _L1& __l1)
352 unique_lock<_L0> __u0(__l0);
361 unique_lock<_L1> __u1(__l1);
372 #ifndef _LIBCPP_HAS_NO_VARIADICS
374 template <class _L0, class _L1, class _L2, class ..._L3>
376 __lock_first(int __i, _L0& __l0, _L1& __l1, _L2& __l2, _L3& ...__l3)
384 unique_lock<_L0> __u0(__l0);
385 __i = try_lock(__l1, __l2, __l3...);
397 unique_lock<_L1> __u1(__l1);
398 __i = try_lock(__l2, __l3..., __l0);
405 if (__i == sizeof...(_L3) + 1)
412 __lock_first(__i - 2, __l2, __l3..., __l0, __l1);
418 template <class _L0, class _L1, class _L2, class ..._L3>
419 inline _LIBCPP_INLINE_VISIBILITY
421 lock(_L0& __l0, _L1& __l1, _L2& __l2, _L3& ...__l3)
423 __lock_first(0, __l0, __l1, __l2, __l3...);
426 #endif // _LIBCPP_HAS_NO_VARIADICS
428 struct _LIBCPP_TYPE_VIS once_flag;
430 #ifndef _LIBCPP_HAS_NO_VARIADICS
432 template<class _Callable, class... _Args>
433 _LIBCPP_INLINE_VISIBILITY
434 void call_once(once_flag&, _Callable&&, _Args&&...);
436 #else // _LIBCPP_HAS_NO_VARIADICS
438 template<class _Callable>
439 _LIBCPP_INLINE_VISIBILITY
440 void call_once(once_flag&, _Callable);
442 #endif // _LIBCPP_HAS_NO_VARIADICS
444 struct _LIBCPP_TYPE_VIS_ONLY once_flag
446 _LIBCPP_INLINE_VISIBILITY
448 once_flag() _NOEXCEPT : __state_(0) {}
451 once_flag(const once_flag&); // = delete;
452 once_flag& operator=(const once_flag&); // = delete;
454 unsigned long __state_;
456 #ifndef _LIBCPP_HAS_NO_VARIADICS
457 template<class _Callable, class... _Args>
459 void call_once(once_flag&, _Callable&&, _Args&&...);
460 #else // _LIBCPP_HAS_NO_VARIADICS
461 template<class _Callable>
463 void call_once(once_flag&, _Callable);
464 #endif // _LIBCPP_HAS_NO_VARIADICS
467 #ifndef _LIBCPP_HAS_NO_VARIADICS
470 class __call_once_param
474 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
475 _LIBCPP_INLINE_VISIBILITY
476 explicit __call_once_param(_Fp&& __f) : __f_(_VSTD::move(__f)) {}
478 _LIBCPP_INLINE_VISIBILITY
479 explicit __call_once_param(const _Fp& __f) : __f_(__f) {}
482 _LIBCPP_INLINE_VISIBILITY
485 typedef typename __make_tuple_indices<tuple_size<_Fp>::value, 1>::type _Index;
490 template <size_t ..._Indices>
491 _LIBCPP_INLINE_VISIBILITY
492 void __execute(__tuple_indices<_Indices...>)
494 __invoke(_VSTD::move(_VSTD::get<0>(__f_)), _VSTD::move(_VSTD::get<_Indices>(__f_))...);
501 class __call_once_param
505 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
506 _LIBCPP_INLINE_VISIBILITY
507 explicit __call_once_param(_Fp&& __f) : __f_(_VSTD::move(__f)) {}
509 _LIBCPP_INLINE_VISIBILITY
510 explicit __call_once_param(const _Fp& __f) : __f_(__f) {}
513 _LIBCPP_INLINE_VISIBILITY
524 __call_once_proxy(void* __vp)
526 __call_once_param<_Fp>* __p = static_cast<__call_once_param<_Fp>*>(__vp);
530 _LIBCPP_FUNC_VIS void __call_once(volatile unsigned long&, void*, void(*)(void*));
532 #ifndef _LIBCPP_HAS_NO_VARIADICS
534 template<class _Callable, class... _Args>
535 inline _LIBCPP_INLINE_VISIBILITY
537 call_once(once_flag& __flag, _Callable&& __func, _Args&&... __args)
539 if (__flag.__state_ != ~0ul)
541 typedef tuple<typename decay<_Callable>::type, typename decay<_Args>::type...> _Gp;
542 __call_once_param<_Gp> __p(_Gp(__decay_copy(_VSTD::forward<_Callable>(__func)),
543 __decay_copy(_VSTD::forward<_Args>(__args))...));
544 __call_once(__flag.__state_, &__p, &__call_once_proxy<_Gp>);
548 #else // _LIBCPP_HAS_NO_VARIADICS
550 template<class _Callable>
551 inline _LIBCPP_INLINE_VISIBILITY
553 call_once(once_flag& __flag, _Callable __func)
555 if (__flag.__state_ != ~0ul)
557 __call_once_param<_Callable> __p(__func);
558 __call_once(__flag.__state_, &__p, &__call_once_proxy<_Callable>);
562 #endif // _LIBCPP_HAS_NO_VARIADICS
564 _LIBCPP_END_NAMESPACE_STD
566 #endif // _LIBCPP_MUTEX